This is a list of all airline codes . The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.
| IATA | ICAO | Airline | Call sign | Country/Region | Comments |
|---|---|---|---|---|---|
| PR | BOI | 2GO | ABAIR | Philippines | |
| EVY | 34 Squadron, Royal Australian Air Force | Multiple | |||
| GNL | 135 Airways | GENERAL | United States | ||
| 1A | n/a | Amadeus IT Group S.A. | n/a | Global | GDS and airline hosting system (CRS/PSS) |
| 1B | n/a | Sabre travel network Asia-Pacific (ex-Abacus) | n/a | APAC | Regional distribution |
| 1E | n/a | Travelsky | n/a | China | Local distribution system and hosting system (CRS/PSS) |
| 1F | n/a | Infini travel information, Inc. | n/a | Japan | Local distribution system (CRS) |
| 1G | n/a | Travelport (Galileo core) | n/a | Global | GDS (CRS) |
| 1H | n/a | Sirena travel | n/a | Russia | Local distribution system (CRS) and PSS |
| 1J | n/a | Axess international network, Inc. | n/a | Japan | Local distribution system (CRS) |
| 1K | n/a | AIRKIOSK | n/a | Global | Local distribution system (CRS) and PSS |
| 1M | n/a | Sirin | n/a | Russia | Local distribution system (CRS) and PSS |
| 1P | n/a | Travelport (Worldspan core) | n/a | Global | GDS (CRS) |
| 1S | n/a | Sabre travel network | n/a | Global | GDS and airline hosting system (CRS/PSS) |
| 1T | n/a | Hitit Computer Services | n/a | Turkey | Computer reservation system |
| 1U | n/a | Google/ITA | n/a | United States | Airline IT provider |
| 2T | TBS | Timbis Air | TIMBIS | Kenya | |
| WYT | 2 Sqn No 1 Elementary Flying Training School | WYTON | United Kingdom | Royal Air Force | |
| TFU | 213th Flight Unit | THJY | Russia | State Airline | |
| CHD | 223rd Flight Unit | CHKALOVSK-AVIA | Russia | State Airline | |
| TTF | 224th Flight Unit | CARGO UNIT | Russia | State Airline | |
| TWF | 247 Jet Ltd | CLOUD RUNNER | United Kingdom | ||
| SEC | 3D Aviation | SECUREX | United States | ||
| Q5 | MLA | 40-Mile Air | MILE-AIR | United States | |
| QRT | 4D Air | QUARTET | Thailand | Defunct | |
| PIU | 43 Air School | PRIMA | South Africa | ||
| 4D | ASD | Air Sinai | AIR SINAI | Egypt | Defunct |
| 4R | SEK | Star East Airline | EAST RIDER | Romania | |
| 4O | AIJ | Interjet | ABC AEROLINEAS | Mexico | Defunct |
| 5W | WAZ | Wizz Air Abu Dhabi | WIZZ SKY | United Arab Emirates | |
| 7B | UBE | Bees Airline | FLOWER BEE | Ukraine | Defunct, AOC revoked due to not having any aircraft. |
| AQ | JYH | 9 Air | TRANS JADE | China | |
| BRO | 2Excel Aviation | BROADSWORD | United Kingdom | ||
| GBT | A-Jet Aviation Aircraft Management | GLOBETROTTER | Austria | ||
| AJR | A-Jet Aviation Company | JET MONGOLIA | Mongolia | ||
| SFM | A-Safar Air Services | AIR SAFAR | Nigeria | ||
| AJJ | A2 Jet Leasing | ATLANTIC JET | United States | ||
| XXV | AASANA | Bolivia | |||
| BBE | Ababeel Aviation | BABEL AIR | Sudan | ||
| 1B | Abacus International | Singapore | Computer reservation system | ||
| BJ | ABJ | Abaeté Linhas Aéreas | ABAETE | Brazil | defunct |
| NKP | Abakan Air | ABAKAN AIR | Russia | 2014 [1] | |
| RL | ABG | Abakan-Avia | ROYAL FLIGHT | Russia | |
| ABE | Aban Air | ABAN | Iran | Former IATA code: K5 | |
| MRP | Abas | ABAS | Czech Republic | ||
| AHU | ABC Air Hungary | ABC HUNGARY | Hungary | defunct | |
| FTY | ABC Bedarfsflug | FLY TYROL | Austria | ||
| W9 | AAB | Abelag Aviation | ABG | Belgium | defunct |
| BDV | Aberdair Aviation | ABERDAV | Kenya | ||
| ROH | Aberdair Aviation Ghana | Ghana | |||
| ADJ | Abidjan Air Cargo | ABICAR | Côte d'Ivoire | defunct | |
| ABP | ABS Jets | BAIR | Czech Republic | Named changed from Aba Air | |
| M3 | TUS | ABSA Cargo | Turismo | Brazil | |
| TTN | Absolute Flight Services | TITANIUM | South Africa | ||
| GB | ABX | ABX Air | ABEX | United States | August 15, 2003 Air operations of former Airborne Express |
| IAE | AC Insat-Aero | Russia | defunct | ||
| NCL | ACA (Ancargo Air) | ANCARGO AIR | Angola | defunct | |
| ACD | Academy Airlines | ACADEMY | United States | ||
| ZA | CYD | AccessAir | CYCLONE | United States | defunct |
| Ace Air | ACE TAXI | South Korea | defunct as of September 2015 | ||
| CFM | ACEF | ACEF | Portugal | Transportes Aéreos e Cargas, code no longer allocated | |
| ARO | Acero Taxi | ACERO | Mexico | ||
| VX | AES | ACES Colombia | ACES | Colombia | defunct |
| BVR | ACM Air Charter | BAVARIAN | Germany | ||
| BJT | ACM Aviation | BAY JET | United States | ||
| CRV | Acropolis Aviation | ACROPOLIS | United Kingdom | ||
| ORS | Action Air | AVIATION SERVICE | Italy | ICAO Code no longer allocated, defunct | |
| AXQ | Action Airlines (Action Air Charter) | ACTION AIR | United States | ||
| AVR | Active Aero Charter, Inc. | ACTIVE AERO | United States | ||
| RRM | Acvila Air-Romanian Carrier | AIR ROMANIA | Romania | defunct | |
| ADC | AD Astra Executive Charter | AD ASTRA | Poland | ||
| VUE | AD Aviation | FLIGHTVUE | United Kingdom | ||
| ADE | Ada Air | ADA AIR | Albania | defunct, former IATA code: ZY | |
| KI | DHI | Adam Air | ADAM SKY | Indonesia | defunct |
| Z7* | ADK | ADC Airlines | ADCO | Nigeria | defunct; former name: Aviation Development Company |
| ADW | ADC Airways | Lebanon | defunct | ||
| DSC | Addis Air Cargo Services | ADDIS CARGO | Ethiopia | ||
| DDS | Addis Airlines | ADDIS LINE | Ethiopia | DEFUNCT | |
| ADF | Ade, Aviación Deportiva | ADE AVIACION | Spain | ||
| TEC | ADI Shuttle Group | TECHJET | United States | ||
| SWH | Adler Aviation | SHOCKWAVE | Canada | ||
| JP | ADR | Adria Airways | ADRIA | Slovenia | defunct as of September 2019 |
| DRO | Adro Servicios Aereos | ADRO SERVICIOS | Mexico | ||
| ADV | Advance Air Charters | ADVANCE | Canada | defunct | |
| AXX | Advance Air Luftfahrtgesellschaft | SKY SHUTTLE | Germany | ||
| AAX | Advance Aviation | ADVANCE AVIATION | Thailand | ||
| XTJ | Advance Aviation Services | United States | |||
| 4G* | Advance Leasing Company | United States | |||
| AN | WSN | Advanced Air | WINGSPAN | United States | 2015 [2] |
| ADD | Advanced Air Co. | Japan | ICAO Code no longer allocated | ||
| ADV | Advanced Flight Training | ADVANCED | United Kingdom | ||
| RDD | Adygea Airlines | ADLINES | Russia | defunct | |
| DVN | Adventia | Spain | |||
| EBS | AEG Aviation Services | United States | |||
| A3 | AEE | Aegean Airlines | AEGEAN | Greece | |
| ALS | Aeralp | AERALP | France | ||
| AEF | Aerea | Spain | |||
| DRD | Aereo Dorado | AEREO DORADO | Mexico | ||
| FUT | Aereo Futuro | AEREO FUTURO | Mexico | ||
| MMG | Aereo Ruta Maya | RUTA MAYA | Guatemala | ||
| AGI | Aereo Transportes Los Angeles de America | ANGELES AMERICA | Mexico | ||
| WWG | Aereo WWG | AERO-W | Mexico | ||
| AED | Aernord | Aernspa | Italy | defunct | |
| AKR | Aero Clinker | AERO CLINKER | Mexico | ||
| RRB | Aero Club de Castellon | Spain | |||
| 9D | CND | Aero Continente Dominicana | CONDOMINICANA | Dominican Republic | defunct |
| ARP | Aero Corporate | IVORYCORP | Côte d'Ivoire | ||
| ML | AEK | Aero Costa Rica | ACORISA | Costa Rica | defunct |
| EPU | Aero Elite Acapulco | ELITACAPULCO | Mexico | ||
| XPN | Aero Express | Niger | |||
| AJP | Aero Jets Corporativos | AEROJETS | Mexico | ||
| VF | TKJ | AJet | ANATOLIAN | Turkey | formerly AnadoluJet |
| OWN | Aero Owen | AERO OWEN | Mexico | 2014 [1] | |
| GHM | Aero Service Bolivia | Bolivia | |||
| GLM | Aero Services Mali | GLOBAL MALI | Mali | ||
| GUE | Aero Servicio Guerrero | AERO GUERRERO | Mexico | ||
| ASR | Aero Sotravia | SOTRAVIA | France | 2014 [1] | |
| ABA | Aero-Beta | AEROBETA | Germany | ||
| DW | UCR | Aero-Charter Ukraine | CHARTER UKRAINE | Ukraine | |
| EAP | Aero-Pyrenees | AERO-PYRENEES | France | ||
| AJH | Aeroaljarafe | ALJARAFE | Spain | ||
| AOB | Aerocaribe Coro | CARIBE CORO | Venezuela | ||
| ACR | Aerocenter, Escuela de Formación de Pilotos Privados de Avión | AEROCENTER | Spain | ||
| ERC | Aerocharter | Guatemala | defunct | ||
| BSO | Aeroclub Barcelona-Sabadell | Spain | |||
| NVA | Aeroclub de Albacete | Spain | |||
| LUE | Aeroclub de Alicante | Spain | |||
| MLL | Aeroclub de Mallorca | MALLORCA | Spain | ||
| AVX | Aeroclub de Vitoria | Spain | |||
| CTD | Aerocorporativos | AEROCORPORATIVOS | Mexico | ||
| RRO | Aerocredo | Russia | |||
| DVI | Aerodavinci | AERO DAVINCI | Mexico | ||
| FAQ | Aerofaq | Ecuador | |||
| SU | AFL | Aeroflot | AEROFLOT | Russia | |
| P3 | PLS | Aeroflot-Plus | AEROPLUS | Russia | |
| AEG | Aerofumigaciones Sam | FUMIGACIONES SAM | Chile | defunct | |
| AGQ | Aerogala | GALASERVICE | Chile | defunct | |
| ARH | Aerohelicopteros | AEROHELCA | Venezuela | 2014 [1] | |
| BJU | AeroJet | JET EXPRESS | Angola | ||
| ARJ | Aerojet de Costa Rica, S.A. | Costa Rica | |||
| LFT | Aerolift Company | LIFTCO | Sierra Leone | defunct | |
| LIN | Aerolimousine | AEROLIMOUSINE | Russia | ||
| PCP | Aerolínea Principal Chile | PRINCIPAL | Chile | ||
| ALT | Aerolíneas Centrales | AERLINEAS CENTRALES | Mexico | ||
| AHL | Aerolíneas Hidalgo | HIDALGO | Mexico | ||
| APR | Aerolíneas Primordiales | AEROPERLAS | Mexico | ||
| LDL | Aerologic | Russia | |||
| VSC | Aeronautic de Los Pirineos | Spain | |||
| PSE | Aeroservicio Sipse | SIPSE | Mexico | ||
| PSL | Aeroservicios Corporativos De San Luis | CORSAN | Mexico | ||
| EAE | Aeroservicios Ecuatorianos | AECA | Ecuador | ||
| AES | Aerosur Paraguay | AEROPARAGUAY | Paraguay | ||
| BTS | Aerotaxis Albatros | AEROLINEAS ALBATROS | Mexico | ||
| PRI | Aerotransportes Privados | AEROPRIV | Mexico | ICAO code in use by another company, call sign no longer allocated | |
| PVA | Aerotransportes Privados | TRANSPRIVADO | Mexico | ||
| VMX | Aeroventas de Mexico | VENTA | Mexico | 2014 [1] | |
| ABU | Aerovías Bueno | AEROBUENO | Colombia | defunct | |
| ACB | African Cargo Services | AFRICARGO | Kenya | ||
| AAP | Arabasco Air Services | ARABASCO | Saudi Arabia | ||
| AAR | Americ Air | PATRIOT | United States | defunct | |
| AAS | Airtransservice | Aviaservice | Russia | defunct | |
| AAS | Austrian Air Services | AIR SERVICES | Austria | defunct | |
| OB | AAT | Austrian Airtransport | AUSTRIAN CHARTER | Austria | defunct; former IATA code: U8, OG; former ICAO code: AUC |
| AAV | Aly Aviation | United Kingdom | defunct; former ICAO code: AAY | ||
| AAW | Austin Airways | AUSTIN | Canada | defunct | |
| SM | AAW | Allied Airways | United Kingdom | defunct, taken over by British European Airways which went on to form British Airways. | |
| AAW | Almeta Air | ALMETA AIR | Austria | defunct | |
| KJ | AAZ | Asian Air | Kyrgyzstan | ||
| ABT | Ambeo | AMBITION | United Kingdom | ||
| ABE | Arberia Airlines | ARBERIA AIRLINES | Albania | defunct | |
| ACE | Air Charter Express | Ghana | |||
| YE | ACQ | Aryan Cargo Express | India | ||
| ACS | Aircraft Sales and Services | AIRCRAFT SALES | Pakistan | ||
| ABS | Air Central | AIR CENTRAL | United States | defunct | |
| ADT | Arrendaminetos y Transportes Turisticos | ARRENDA-TRANS | Mexico | ||
| ADZ | Avio Delta | Bulgaria | |||
| AED | Aie Experience Flight | AIE EXPERIENCE | United Kingdom | defunct | |
| VJ | AFF | Africa Airways | AFRIWAYS | Benin | defunct |
| AFM | AEROSPEED FORMATION ET MAINTENANCE | EPIC AIR | France | ||
| LBR | Air Costa (Lepl Project Limited) | India | defunct | ||
| QH | FLA | Air Florida | PALM | United States | relaunching |
| 3O | MAC | Air Arabia Maroc | ARABIA MAROC | Morocco | This ICAO designator was previously used by Malta Air Charter |
| MRY | Air Marine | AIR MARINE | France | ||
| PNK | Air Pink | AIRPINK | Serbia | ||
| PXG | Aitheras Aviation Group | United States | |||
| AFN | African International Airlines | SIMBA | Lesotho | ||
| HD | ADO | AIRDO | AIR DO | Japan | |
| ACC | Airspeed Charter | Jamaica | 2014 [1] | ||
| PNX | AIS Airlines | SPINNER | Netherlands | ||
| AVD | Álamo Aviación, S.L. | ALAMO | Spain | ||
| FSY | Algonquin Airlink | FROSTY | Canada | 2014 [1] | |
| TTX | Alliance Air Charters | TWISTER | United States | ||
| UJ | LMU | AlMasria Universal Airlines | ALMASRIA | Egypt | |
| ALN | Alpha Jet, S.R.O. | TOLEMAC | Slovakia | 2014 [1] | |
| APN | Alpine Airlines | AIR ALPES | France | ||
| BAH | The Amiri Flight | BAHRAIN | Bahrain | ||
| A2 | AWG | Animawings | ANIMA WINGS | Romania | |
| TLB | Atlantique Air Assistance | TRIPLE-A | France | ||
| UJX | Atlas Ukraine Airlines | ATLAS UKRAINE | Ukraine | 2014 [1] | |
| AGM | Aviation West Charters | ANGEL MED | United States | 2015 [3] | |
| X9 | NVD | Avion Express | NORDVIND | Lithuania | Name changed from Nordic Solutions Air |
| AZB | Azamat | TUMARA | Kazakhstan | defunct | |
| 3S* | AEN | Aeroland Airways | AEROLAND | Greece | defunct, ICAO code no longer allocated |
| NGF | Air Charity Network | ANGEL FLIGHT | United States | Re-allocated in 2014 was used by Angel Flight America [4] | |
| WFT | Aircharters Worldwide | WORLD FLIGHT | United States | Allocated 2014 [5] | |
| JU | ASL | Air Serbia | AIR SERBIA | Serbia | Name changed from Aeroput to JAT Yugoslav Airlines to Jat Airways to Air Serbia. Formerly used JAT as ICAO code. |
| QH | LYN | Air Kyrgyzstan | ALTYN AVIA | Kyrgyzstan | Name changed from Kyrgyzstan |
XK | CCM | Air Corsica | CORSICA | France | |
| AHS | AHS Air International | HIGH SKY | Pakistan | ||
| ROO | Aero Roa | AERO ROA | Mexico | ||
| AWF | Aeroforward | United States | |||
| SUP | Aeronautical Charters | SUN SPEED | United States | ||
| PSO | Aerotaxis Pegaso | AEROPEGASO | Mexico | ||
| EI | EIN | Aer Lingus | SHAMROCK | Ireland | |
| EG | EUK | Aer Lingus UK | GREEN FLIGHT | United Kingdom | |
| VLB | Air Volta | VOLTA | Bulgaria | ||
| FCJ | AirSprint US | FRACJET | United States | Previously used code "HAB" | |
| TEW | Airteam Charter | TEAMWORK | South Africa | ||
| STT | Alpha Star Charter | STAR CHARTER | Saudi Arabia | ||
| LBZ | Angkasa Super Service | Indonesia | |||
| HEZ | Arrow Aviation | ARROW | Israel | ||
| UAH | Air Experience Flight, Cranwell | United Kingdom | Royal Air Force | ||
| RVQ | Aero Jet International | REVA AIR | United States | ||
| ASK | Aerosky | MULTISKY | Spain | ||
| AEH | Aero4m | AEROCUTTER | Slovenia | ||
| ERO | Aeroecom | AEROECOM | Venezuela | ||
| A8 | XAU | Aerolink Uganda | PEARL | Uganda | |
| NKY | Aeromonkey | AEROMON | Mexico | ||
| AWP | Aeroworld Pakistan | Pakistan | |||
| AGA | AG Air | GEOLINE | Georgia | ||
| ABZ | Air Ambulance Services | ISLAND LIFEFLIGHT | Bahamas | ||
| RV | ROU | Air Canada Rouge | ROUGE | Canada | |
| CNM | Air China Inner Mongolia | MENGYUAN | China | ||
| VRE | Air Côte d'Ivoire | COTE DIVORIE | Ivory Coast | ||
| AWL | Air Walser | Malta | |||
| AXY | Air X Charter | LEGEND | Malta | ||
| OES | ART Aviation | ART AUSTRIA | Austria | ||
| ASF | Austrian Air Force | AUSTRIAN AIRFORCE | Austria | ||
| AVG | Aviation Legacy | AVILEF | Gambia | ||
| 7A | AZY | Aztec Worldwide Airlines | AZTEC WORLD | United States | |
| 6U | ACX | Air Cargo Germany | LOADMASTER | Germany | defunct |
| AAD | Aero Aviation Centre Ltd. | SUNRISE | Canada | Ceased operations 1995 | |
| SII | Aero Servicios Ejecutivos Internacionales | ASEISA | Mexico | ||
| BZS | Aero Biniza | BINIZA | Mexico | ||
| Aero Comondu | AERO COMONDU | Mexico | |||
| AET | Aero-Palma | AERO PALMA | Spain | defunct | |
| ABM | Aero Albatros | ALBATROS ESPANA | Spain | ||
| ZI | AAF | Aigle Azur | AIGLE AZUR | France | Former name: Lucas Aigle Azur; former IATA code: LK |
| AAM | Aim Air | Moldova | |||
| AAO | Atlantis Airlines (USA) | ATLANTIS AIR | United States | ||
| AAP | Aerovista Airlines | AEROVISTA GROUP | Kyrgyzstan | defunct | |
| AE | AE | Air Ceylon | CEYLON | Sri Lanka | defunct |
| 4K* | AAS | Askari Aviation | AL-ASS | Pakistan | |
| AAU | Australia Asia Airlines | AUSTASIA | Australia | Subsidiary merged into Qantas; former IATA code: IM | |
| AAV | Astro Air International | ASTRO-PHIL | United States | ||
| 8U | AAW | Afriqiyah Airways | AFRIQIYAH | Libya | |
| Q9 | AFU | Afrinat International Airlines | AFRINAT | Gambia | defunct, ICAO code no longer allocated |
| AAX | Afric'air Express | AFREX | Côte d'Ivoire | defunct | |
| BRL | Air Brasd'or | BRASD'OR | Canada | ||
| AFH | Air Fecteau | FECTO | Canada | defunct | |
| BRM | Air 500 | BOOMERANG | Canada | defunct | |
| AAG | Atlantic Flight Training | ATLANTIC | United Kingdom | Changed from Air Atlantique in 2014 [1] | |
| KI | AAG | Air Atlantique | ATLANTIC | United Kingdom | Former name: Atlantic Air Transport; former IATA codes: 7M, DG, transferred to Atlantic Flight Training in 2014. |
| QB | AAJ | Air Alma | AIR ALMA | Canada | Ceased operations 10/01/2002; former IATA code: 4L |
| ACS | Air Cess | Liberia | defunct | ||
| ADT | Air Dorval | AIR DORVAL | Canada | defunct | |
| AHN | Air Hungaria | AIR HUNGARIA | Hungary | ||
| AHR | Air Adriatic | ADRIATIC | Croatia | defunct | |
| LD | AHK | Air Hong Kong | AIR HONG KONG | Hong Kong | |
| AHS | Air Viggi San Raffaele | AIRSAR | Italy | ||
| AAI | Air Aurora | BOREALIS | United States | Former IATA code: AX | |
| ACU | Air Cargo Transportation System | AFRISPIRIT | Kenya | ||
| ACV | Air Charter Service | United Kingdom | ICAO code no longer allocated | ||
| ADC | Air Atlantic Dominicana | ATLAN-DOMINICAN | Dominican Republic | defunct | |
| 2Y | ADW | Air Andaman | AIR ANDAMAN | Thailand | defunct 2004 |
| UX | AEA | Air Europa | EUROPA | Spain | |
| AEQ | Air Express | LUNA | Sweden | ||
| IG | AEY | Air Italy | AIR ITALY | Italy | merged into Meridiana |
| ASW | Air Southwest Ltd. | AIRSOUTHWEST | Canada | defunct | |
| ASX | Air Special | AIRSPEC | Czech Republic | ||
| NX | AMU | Air Macau | AIR MACAO | Macao | |
| 6A | AMW | Armenia Airways | ARMENIA | Armenia | |
| HM | SEY | Air Seychelles | SEYCHELLES | Seychelles | |
| SFB | Air Sofia | AIR SOFIA | Bulgaria | defunct | |
| BRF | Air Bravo | AIR BRAVO | Uganda | ||
| AF | AFR | Air France | AIRFRANS | France | |
| ACG | Air Partner | AIR PARTNER | United Kingdom | ||
| SB | ACI | Air Caledonie International | AIRCALIN | France | |
| VSG | AirClass Airways | VISIG | Spain | formerly Visig Operaciones Aéreas | |
| EH | AKX | Air Nippon Network Co. Ltd. | ALFA WING | Japan | merged into ANA Wings |
| ALM | Air ALM | ANTILLEAN | Netherlands Antilles | defunct | |
| ALN | Air Lincoln | CHICAGO LINCOLN | United States | ||
| ACM | Air Caledonia | WEST CAL | Canada | ||
| ED | AXE | AirExplore | GALILEO | Slovakia | |
| AGM | Air Guam | AIR GUAM | United States | ||
| ZW | AWI | Air Wisconsin | WISCONSIN | United States | |
| ALU | Air Luxor STP | LUXORJET | São Tomé and Príncipe | ||
| YI | RSI | Air Sunshine | AIR SUNSHINE | United States | |
| GN | AGN | Air Gabon | GOLF NOVEMBER | Gabon | defunct |
| 9T | RUN | Air ACT | CARGO TURK | Turkey | |
| AFV | Air Afrique Vacancies | AFRIQUE VACANCE | Côte d'Ivoire | ||
| ZB | ABN | Air Albania | AIR ALBANIA | Albania | |
| 3J | AAQ | Air Alliance | LIAISON | Canada | defunct |
| WP | ATW | Air Antwerp | DEVIL | Belgium | defunct |
| BX | ABL | Air Busan | AIR BUSAN | South Korea | |
| ACH | Air Cargo Plus | AIR PLUS | Liberia | ||
| AAT | Air Central Asia | Kyrgyzstan | |||
| LB | LEP | Air Costa | LECOSTA | India | |
| AFS | Air Data | United Kingdom | |||
| GL | GRL | Air Greenland | GREENLAND | Greenland | |
| 3S | GUY | Air Guyane Express | GREEN BIRD | French Guiana | |
| AHO | Air Hamburg | AIR HAMBURG | Germany | ||
| NQ | AJX | Air Japan | AIR JAPAN | Japan | |
| IJ | LIB | Air Liberté | LIBERTE | France | defunct |
| TT | KLA | Air Lithuania | KAUNAS | Lithuania | defunct |
| QM | AIM | Air Malawi | MALAWI | Malawi | defunct |
| L6 | AMI | Air Maldives | AIR MALDIVES | Maldives | defunct |
| ML | BIE | Air Mediterranee | MEDITERRANEE | France | defunct |
| P8 | MKG | Air Mekong | MEKONG | Vietnam | defunct |
| AMG | Air Minas Linhas Aéreas | AIR MINAS | Brazil | defunct | |
| 4O | MNE | Air Montenegro | MOUNT EAGLE | Montenegro | |
| TAH | Air Moorea | AIR MOOREA | France | defunct | |
| ANV | Air Nevada | AIR NEVADA | United States | ||
| NZ | ANZ | Air New Zealand | NEW ZEALAND | New Zealand | "NZ" used by New Zealand National Airways Corporation until its merger with Air New Zealand in 1978 "TE" used by TEAL from 1940-1965, then Air New Zealand from 1965-1990 |
| 4N | ANT | Air North Charter - Canada | AIR NORTH | Canada | |
| AOE | Air One Executive | Italy | |||
| AEI | Air Poland | POLISH BIRD | Poland | defunct | |
| YP | APZ | Air Premia | AIR PREMIA | South Korea | |
| AVZ | Air Valencia | AIR VALENCIA | Spain | ||
| AMO | Air Montreal (Air Holdings Inc.) | AIR MONTREAL | Canada | ||
| BM | Air Sicilia | Italy | defunct | ||
| AMR | Air Specialties Corporation | AIR AM | United States | Air American, Total Air | |
| AMS | Air Muskoka | AIR MUSKOKA | Canada | ||
| AOJ | Avcon Jet | ASTERIX | Austria | ||
| AJU | Air Jetsul | AIRJETSUL | Portugal | ||
| AKA | Air Korea Co. Ltd. | Republic of Korea | |||
| LIV | Air Livonia | LIVONIA | Estonia | defunct | |
| ZX | ABL | Air BC | AIRCOACH | Canada | Merged into Air Canada Jazz |
| ABN | Air Fret Senegal | Senegal | |||
| LJA | Air Jamahiriya Company | AIR JAMAHIRIYA | Libya | ICAO code no longer allocated | |
| G8 | AGB | Air Service Gabon | Gabon | defunct | |
| 7T | AGV | Air Glaciers | AIR GLACIERS | Switzerland | |
| MVM | Air Cargo America | PEGASUS | United States | ||
| AMY | Air Ambar | AIR AMBAR | Dominican Republic | ||
| 6V | VGA | Air Vegas | AIR VEGAS | United States | defunct |
| AOU | Air Tractor | AIR TRACTOR | Croatia | ||
| APA | Air Park Aviation Ltd. | CAN-AM | Canada | ||
| APG | Air People International | AIR PEOPLE | Thailand | ||
| NH | ANA | All Nippon Airways | ALL NIPPON | Japan | |
| ANB | Air Navigation And Trading Co. Ltd. | AIR NAV | United Kingdom | Former ICAO code: AAT | |
| NGO | Air-Angol | AIR ANGOL | Angola | ||
| TZ | TWG | air-taxi Europe | TWINGOOSE | Germany | |
| NGP | Air Nigeria | REGAL EAGLE | Nigeria | defunct | |
| 2Q | SNC | Air Cargo Carriers | NIGHT CARGO | United States | |
| SND | Air Samarkand | ARSAM | Uzbekistan | ||
| V7 | SNG | Air Senegal International | AIR SENEGAL | Senegal | defunct |
| SNY | Air Sandy | AIR SANDY | Canada | ||
| AII | Air Integra | INTEGRA | Canada | ||
| BFF | Air Baffin | AIR BAFFIN | Canada | renamed to Air Nunavut | |
| BDM | Air Bandama | BANDAMA | Ivory Coast | ||
| AB | BER | Air Berlin | AIR BERLIN | Germany | defunct |
| ABT | Air Brousse | AIR BROUSSE | Canada | defunct | |
| APV | Air Plan International | AIR PLAN | Democratic Republic of the Congo | ||
| ARX | Air Xpress, Inc. | AIREX | United States | ||
| HTT | Air Tchad | HOTEL TANGO | Chad | ||
| ARZ | Air Resorts | AIR RESORTS | United States | ||
| ASB | Air-Spray 1967 Ltd. | AIR SPRAY | Canada | ||
| ASC | Air Star Corporation | AIR STAR | Canada | ||
| 4D | ASD | Air Sinai | AIR SINAI | Egypt | |
| AQN | Air Queensland | BUSHAIR | Australia | defunct | |
| ARC | Air Routing International Corp. | United States | |||
| QN | ARR | Air Armenia | AIR ARMENIA | Armenia | |
| AIL | Air Illinois | AIR ILLINOIS | United States | defunct | |
| AI | AIC | Air India Limited | AIRINDIA | India | |
| AIG | Air Inter Gabon | Gabon | |||
| PJ | SPM | Air Saint Pierre | SAINT-PIERRE | France | |
| SZ | WOW | Air Southwest | SWALLOW | United Kingdom | defunct |
| ATJ | Air Traffic GmbH | SNOOPY | Germany | ||
| 8C | ATN | Air Transport International | AIR TRANSPORT | United States | |
| ATQ | Air Transport Schiphol | MULTI | Netherlands | ||
| ATS | Air Transport Service | Democratic Republic of the Congo | |||
| AVG | Air Falcon | DJIBOUTI FALCON | Djibouti | ||
| AUX | Air Uganda International Ltd. | Uganda | |||
| NF | AVN | Air Vanuatu | AIR VAN | Vanuatu | |
| ZB | BUB | Air Bourbon | BOURBON | Reunion | defunct |
| CC | ABD | Air Atlanta Icelandic | ATLANTA | Iceland | |
| AIE | Air Inuit | AIR INUIT | Canada | ||
| AIS | Air Sureste | SURESTE | Spain | ||
| RB | SBK | Air Srpska | Air Srpska | Bosnia and Herzegovina | defunct |
| TN | THT | Air Tahiti Nui | TAHITI AIRLINES | France | |
| SW | NMB | Air Namibia | NAMIBIA | Namibia | defunct |
| NSK | Air Intersalonika | INTERSALONIKA | Greece | ||
| NTL | Air Anatolia | AIR ANATOLIA | Turkey | defunct | |
| SGA | Air Saigon | AIR SAIGON | Vietnam | ||
| AFW | Afrique Regional Airways | AFRAIR | Côte d'Ivoire | defunct | |
| AW | AFW | Africa World Airlines | BLACKSTAR | Ghana | |
| ACX | Air Charters | PARAIR | Canada | defunct | |
| PE | AEL | Air Europe Italy | AIR EUROPE | Italy | defunct |
| JM | AJM | Air Jamaica | JAMAICA | Jamaica | merged into Caribbean Airlines; ICAO and IATA codes no longer used. |
| AWN | Air Niamey | AIR NIAMEY | Niger | ||
| AWT | Air West | AIR WEST | Canada | ||
| 6G | AWW | Air Wales | RED DRAGON | United Kingdom | defunct, ICAO code no longer allocated |
| TX | FWI | Air Caraïbes | FRENCH WEST | France | |
| IX | AXB | Air India Express | EXPRESS INDIA | India | |
| AXD | Air Express | AIR SUDEX | Sudan | ||
| BSB | Air Wings | ARBAS | Moldova | ||
| BT | BTI | Air Baltic | AIRBALTIC | Latvia | |
| ANI | Air Atlantic (Nig) Limited | NIGALANTIC | Nigeria | ||
| EL | ANK | Air Nippon | ANK AIR | Japan | merged into All Nippon Airways, ICAO code no longer allocated |
| YW | ANE | Air Nostrum | AIR NOSTRUM | Spain | |
| PX | ANG | Air Niugini | NIUGINI | Papua New Guinea | |
| G9 | ABY | Air Arabia | ARABIA | United Arab Emirates | |
| AC | ACA | Air Canada | AIR CANADA | Canada | |
| AP | LAV | AlbaStar | ALBASTAR | Spain | |
| E9 | MHS | Air Memphis | AIR MEMPHIS | Egypt | defunct |
| XT | AXL | Air Exel | EXEL COMMUTER | Netherlands | defunct |
| AZF | Air Zermatt AG | AIR ZERMATT | Switzerland | ||
| UM | AZW | Air Zimbabwe | AIR ZIMBABWE | Zimbabwe | |
| MHU | Air Memphis | MEPHIS UGANDA | Uganda | ||
| MKH | Air Marrakech Service | AIR MARRAKECH | Morocco | ||
| AZX | Air Max Africa | AZIMA | Gabon | defunct | |
| S2 | RSH | Air Sahara | SAHARA | India | renamed to Jetlite |
| ATA | Air Transport Association | United States | |||
| TC | ATC | Air Tanzania | TANZANIA | Tanzania | |
| XAC | Air Charter World | United States | |||
| 2J | VBW | Air Burkina | BURKINA | Burkina Faso | |
| ATH | Air Travel Corp. | AIR TRAVEL | United States | ||
| KM | AMC | Air Malta | AIR MALTA | Malta | |
| YT | TGA | Air Togo | AIR TOGO | Togo | defunct |
| ASJ | Air Satellite | SATELLITE | Canada | defunct | |
| ASN | Air and Sea Transport | Russia | |||
| ASS | Air Class, S.A. de C.V. | AIR CLASS | Mexico | ||
| NPL | Air Nepal International | AIR NEPAL | Nepal | defunct | |
| NPR | Air Napier | New Zealand | defunct | ||
| WAM | Air Taxi & Cargo | TAXI CARGO | Sudan | ||
| RSM | Air Somalia | AIR SOMALIA | Somali Republic | ||
| AWZ | AirWest | Sudan | |||
| G4 | AAY | Allegiant Air | ALLEGIANT | United States | |
| AAZ | Angus Aviation | ANGUS | Canada | defunct | |
| ABA | Artem-Avia | ARTEM-AVIA | Ukraine | defunct | |
| ABB | African Business and Transportations | AFRICAN BUSINESS | Democratic Republic of the Congo | ||
| ABF | Aerial Oy | SKYWINGS | Finland | ||
| ABK | Alberta Citylink | ALBERTA CITYLINK | Canada | defunct, ICAO code no longer allocated | |
| ABO | APSA Colombia | AEROEXPRESO | Colombia | aka Aeroexpreso Bogota | |
| O4 | ABV | Antrak Air | ANTRAK | Ghana | |
| GB | ABX | Airborne Express | ABEX | United States | August 14, 2003 merged into DHL |
| ABZ | ATA Brasil | ATA-BRAZIL | Brazil | defunct | |
| ACC | Avcard Services | United Kingdom | ICAO code no longer allocated | ||
| ACY | Atlas Cargo Airlines | ATLAS CARGOLINES | Morocco | ||
| ADA | Airservices Australia | AUSCAL | Australia | Flight Inspection Unit | |
| 8T | TID | Air Tindi | TINDI | Canada | |
| ADB | Antonov Airlines | ANTONOV BUREAU | Ukraine | Antonov Design Bureau | |
| ADG | Aerea Flying Training Organization | AEREA TRAINING | Spain | ||
| ADI | Audeli Air | AUDELI | Spain | ||
| ADL | Aero Dynamics | COTSWOLD | United Kingdom | ||
| ADN | Aero-Dienst | AERODIENST | Germany | ||
| ADP | Aerodiplomatic | AERODIPLOMATIC | Mexico | ||
| 3L | ADY | Air Arabia Abu Dhabi | Nawras [6] [7] | United Arab Emirates | |
| ADQ | Avion Taxi | AIR DATA | Canada | 2695731 Canada Inc. | |
| ADS | Aviones de Sonora | SONORAV | Mexico | ||
| ADU | Airdeal Oy | AIRDEAL | Finland | ||
| EM* | AEB | Aero Benin | AEROBEN | Benin | defunct |
| AEC | Aerocésar | AEROCESAR | Colombia | defunct; aka Aerovías del César | |
| AED | Aerotrans Airlines | Russia | defunct | ||
| ADX | Anderson Aviation | ANDAX | United States | ||
| AEI | Aeroexpreso Interamericano | INTERAM | Colombia | defunct | |
| AEJ | Air Express | KHAKI EXPRESS | Tanzania | ||
| AEK | Aerocon | AEROCON | Bolivia | ||
| AEM | Aero Madrid | AEROMADRID | Spain | ||
| KD | AEN | Air Enterprise | AIR ENTERPRISE | France | defunct |
| AEO | Aeroservicios Ejecutivos Del Occidente | AERO OCCIDENTE | Mexico | ||
| AEP | Aerotec Escuela de Pilotos | AEROTEC | Spain | ||
| AX | AAC | AmericanConnection [8] | CONNECT AMERICA | United States | defunct |
| AN | AAA | Ansett Australia | ANSETT | Australia | defunct |
| AAC | Army Air Corps | ARMYAIR | United Kingdom | ||
| 5W | AEU | Astraeus | FLYSTAR | United Kingdom | defunct, ICAO code no longer allocated |
| AEV | Aeroventas | AEROVENTAS | Mexico | ||
| VV | AEW | Aerosvit Airlines | AEROSVIT | Ukraine | defunct |
| AEX | Airway Express | AVCO | United States | ICAO code no longer allocated | |
| AEZ | Aerial Transit | AERIAL TRANZ | United States | ||
| AFA | Alfa Air | BLUE ALFA | Czech Republic | ||
| WK | AFB | American Falcon | AMERICAN FALCON | Argentina | defunct |
| UTY | Alliance Airlines | UNITY | Australia | ||
| UVS | Air Universal | UNI-LEONE | Sierra Leone | defunct | |
| UVT | Auvia Air | AUVIA | Indonesia | ||
| AFC | African West Air | AFRICAN WEST | Senegal | ||
| AFE | Airfast Indonesia | AIRFAST | Indonesia | ||
| FG | AFG | Ariana Afghan Airlines | ARIANA | Afghanistan | |
| RV* | AFI | Africaone | AFRICAWORLD | The Gambia | |
| Y2 | AFJ | Alliance Air | JAMBO | Uganda | Ceased operations 08/10/2000 |
| AFK | Africa Air Links | AFRICA LINKS | Sierra Leone | ||
| AFO | Aero Empresa Mexicana | AERO EMPRESA | Mexico | ||
| AFQ | Alba Servizi Aerotrasporti | ALBA | Italy | ||
| 5Z | AFX | Airfreight Express | United Kingdom | Ceased operations 08/03/2002 | |
| AFY | Africa Chartered Services | AFRICA CHARTERED | Nigeria | ||
| AFZ | Africa Freight Services | AFREIGHT | Zambia | ||
| AGA | Aeronaves Del Centro | Venezuela | |||
| AGC | Arab Agricultural Aviation Company | AGRICO | Egypt | ||
| AGF | Atlantic Gulf Airlines | ATLANTIC GULF | United States | defunct | |
| 5D | SLI | Aeroméxico Connect | COSTERA | Mexico | |
| AGG | Algoma Airways | ALGOMA | Canada | ICAO code no longer allocated | |
| AGH | Altagna | ALTAGNA | France | ||
| AGO | Angola Air Charter | ANGOLA CHARTER | Angola | ||
| AGP | AERFI Group | AIR TARA | Ireland | ||
| 1A | AGT | Amadeus IT Group | AMADEUS | Spain | |
| AGU | Angara Airlines | SARMA | Russia | ||
| AGW | Aero Gambia | AERO GAMBIA | Gambia | defunct, ICAO code no longer allocated | |
| JJ | AGX | Aviogenex | GENEX | Serbia | defunct |
| BLR | Atlantic Coast Airlines | BLUE RIDGE | United States | defunct | |
| BLZ | Aero Barloz | AEROLOZ | Mexico | ||
| PL | PLI | Aeroperú | Aeroperu | Peru | defunct |
| 8A | BMM | Atlas Blue | ATLAS BLUE | Morocco | defunct |
| BNB | Aero Banobras | AEROBANOBRAS | Mexico | ||
| AGY | Aero Flight Service | FLIGHT GROUP | United States | ||
| AGZ | Agrolet-Mci | AGROLET | Slovakia | ||
| GD | AHA | Air Alpha Greenland | AIR ALPHA | Denmark | sold to Air Greenland |
| AHC | Azal Avia Cargo | AZALAVIACARGO | Azerbaijan | Cargo Airline of the State Concern Azerbaijan Hava | |
| AHE | Airport Helicopter Basel, Muller & Co. | AIRPORT HELICOPTER | Switzerland | ||
| CJE | Aeroservices Corporate | BIRD JET | France | ||
| AHF | Aspen Helicopters | ASPEN | United States | ||
| AHG | Aerochago Airlines | AEROCHAGO | Dominican Republic | defunct | |
| AHH | Airplanes Holdings | AIRHOLD | Ireland | ||
| AHP | Aerochiapas | AEROCHIAPAS | Mexico | ||
| HT | AHW | Aeromist-Kharkiv | AEROMIST | Ukraine | defunct |
| J2 | AHY | Azerbaijan Airlines | AZAL | Azerbaijan | |
| U3 | AIA | Avies | AVIES | Estonia | |
| 4Y | AIB | Airbus Industrie | AIRBUS INDUSTRIE | France | |
| KJ | AIH | Air Incheon | AIR INCHEON | South Korea | |
| RS | ASV | Air Seoul | AIR SEOUL | South Korea | |
| AIK | African Airlines International Limited | AFRICAN AIRLINES | Kenya | ||
| AIN | African International Airways | FLY CARGO | Eswatini | ||
| 5A | AIP | Alpine Air Express | ALPINE AIR | United States | |
| AIU | Alicante Internacional Airlines | ALIA | Spain | ||
| PA | ABQ | Airblue | AIRBLUE | Pakistan | |
| THM | Airmark Aviation | THAI AIRMARK | Thailand | ||
| AIR | Airlift International | AIRLIFT | United States | defunct | |
| AIT | Airest | AIREST CARGO | Estonia | ||
| AIV | Airvias S/A Linhas Aéreas | AIRVIAS | Brazil | ||
| W4 | BES | Aero Services Executive | BIRD EXPRESS | France | |
| AIW | Atlantic Island Airways | TARTAN | Canada | ||
| AIX | Aircruising Australia | CRUISER | Australia | ||
| AIY | Aircrew Check and Training Australia | AIRCREW | Australia | ||
| IZ | AIZ | Arkia Israel Airlines | ARKIA | Israel | |
| AJA | Afghan Jet International Airlines | AFGHAN JET | Afghanistan | ||
| AJB | Aero JBR | AERO JBR | Mexico | ||
| AJE | Aero Jet Express | JET EXPRESS | Mexico | defunct | |
| AJI | Ameristar Jet Charter | AMERISTAR | United States | ||
| AJK | Allied Air | BAMBI | Nigeria | ||
| AJO | Aero Ejecutivo | AEROEXO | Mexico | defunct | |
| AJS | Aeroejecutivos Colombia | AEROEJECUTIVOS | Colombia | Aeroejecutivos Aeroservicios Ejecutivos | |
| M6 | AJT | Amerijet International | AMERIJET | United States | |
| AJV | ANA & JP Express | AYJAY CARGO | Japan | merged into Air Japan | |
| AJW | Alpha Jet International | ALPHAJET | United States | ||
| AJY | AJet | AYJET | Cyprus | defunct, ICAO code no longer allocated | |
| AKB | Aktjubavia | KARAB | Kazakhstan | ||
| AKC | Arca Aerovías Colombianas Ltda. | ARCA | Colombia | ||
| AKF | Anikay Air Company | ANIKAY | Kyrgyzstan | ||
| AKH | Akhal | AKHAL | Turkmenistan | ||
| MNI | Aeromilenio | AEROMIL | Mexico | ||
| AKK | Aklak Air | AKLAK | Canada | ||
| 4A | AKL | Air Kiribati | KIRIBATI | Kiribati | |
| AKN | Alkan Air | ALKAN AIR | Canada | ||
| AKW | Angkor Airways | ANGKORWAYS | Cambodia | defunct | |
| AKZ | AK Navigator LLC | ABSOLUTE | Kazakhstan | ICAO code no longer allocated | |
| ALB | Aero Albatros | ALBATROS | Mexico | ||
| ALD | Albion Aviation | ALBION | United Kingdom | ||
| ALE | Aeroalas Colombia | AEROALAS | Colombia | defunct | |
| ALF | Allied Command Europe (Mobile Force) | ACEFORCE | Belgium | ||
| FYS | American Flyers | AMERICAN FLYERS | United States | ||
| DFA | Aero Coach Aviation | AERO COACH | United States | ||
| EV | ASQ | Atlantic Southeast Airlines | ACEY | United States | Merged into ExpressJet Airlines |
| ALG | Air Logistics | AIRLOG | United States | ||
| ALL | Aerovallarta | VALLARTA | Mexico | ||
| HP | AWE | America West Airlines | CACTUS | United States | Merged with US Airways |
| 6R | TNO | Aerotransporte de Carga Union | AEROUNION | Mexico | |
| TND | Aero Taxis Cessna | TAXIS CESSNA | Mexico | ||
| TMP | Arizona Express Airlines | TEMPE | United States | ||
| ALO | Allegheny Commuter Airlines | ALLEGHENY | United States | US Airways Express | |
| ALP | Allpoints Jet | ALLPOINTS | China | ||
| ALP | Alpliner AG | ALPINER | Switzerland | Code now allocated to another user | |
| ALQ | Altair Aviation (1986) | ALTAIR | Canada | ||
| VH | ALV | Aeropostal Alas de Venezuela | AEROPOSTAL | Venezuela | |
| ALW | Alas Nacionales, S.A. | ALNACIONAL | Dominican Republic | ||
| ALY | Alyeska Air Service | ALYESKA | United States | ||
| ALZ | Alta Flights (Charters) Ltd. | Canada | |||
| AMA | ATMA | ADIK | Kazakhstan | ||
| AMD | Aerolíneas Medellín | AEROLINEAS MEDELLIN | Colombia | defunct | |
| AMF | Ameriflight | AMFLIGHT | United States | ||
| AMH | Alan Mann Helicopters Ltd. | MANN | United Kingdom | ICAO code no longer allocated | |
| AMJ | Aviation Amos | AVIATION AMOS | Canada | ||
| AMK | Amerer Air | AMER AIR | Austria | ||
| AMM | Aeroputul International Marculesti | AEROM | Moldova | ||
| DP | AMM | Air 2000 | JETSET | United Kingdom | defunct |
| AMP | Aero Transporte S.A. (ATSA) | ATSA | Peru | ||
| AMQ | Aeromedicare Ltd. | LIFELINE | United Kingdom | No longer current | |
| AMQ | Aircraft Management and Consulting | AMEX | Poland | ||
| TZ | AMT | ATA Airlines | AMTRAN | United States | defunct |
| YJ | AMV | AMC Airlines | AMC AIRLINES | Egypt | Aircraft Maintenance Company |
| AM | AMX | Aeroméxico | AEROMEXICO | Mexico | |
| AMZ | Amiya Airline | AMIYA AIR | Nigeria | ||
| ANC | Anglo Cargo | ANGLO | United Kingdom | Defunct, ICAO code no longer allocated | |
| BRP | AeroBratsk | AEROBRA | Russia | ||
| ANH | Alajnihah for Air Transport | ALAJNIHAH | Libya | ||
| ANM | Aerotransportacion de Norteamerica | NORAM | Mexico | ||
| ANM | Antares Airtransport, Maintenance & Service GmbH | ANTARES | Germany | ICAO Code now allocated to another user | |
| TL | ANO | Airnorth | TOPEND | Australia | |
| ANQ | Aerolínea de Antioquia | ANTIOQUIA | Colombia | ||
| OY | ANS | Andes Líneas Aéreas | AEROANDES | Argentina | |
| IW | AOM | AOM French Airlines | French Lines | France | defunct |
| ANW | Aviación Del Noroeste, S.A. de C.V. | AVINOR | Mexico | defunct | |
| SAP | Avia Jaynar | TOBOL | Kazakhstan | ||
| EMS | Aero Servicios Empresariales | SERVIEMPRESARIAL | Mexico | ||
| AOA | Alcon Servicios Aéreos, S.A. de C.V. | ALCON | Mexico | ||
| J6 | AOC | AVCOM | AERO AVCOM | Russia | |
| AOD | Aero Vodochody | AERO CZECH | Czech Republic | ||
| AOF | Atair Pty Ltd. | ATAIR | South Africa | ||
| 2D | AOG | Aero VIP | AVIP | Argentina | defunct |
| MUN | Aeromundo Ejecutivo | AEROMUNDO | Mexico | ||
| MUR | Aerolínea Muri | MURI | Mexico | ||
| AOI | Astoria, Inc. | ASTORIA | Canada | defunct | |
| NRO | Aero Rent JSC | AEROMASTER | Russia | defunct | |
| NRP | Aeronord-Grup | AERONORD | Moldova | ||
| AOK | Aeroatlantico Colombia | Colombia | defunct | ||
| AOL | Angkor Airlines | ANGKOR AIR | Cambodia | defunct | |
| AON | Aero Entreprise | AERO ENTERPRISE | France | ||
| AOO | As, Opened Joint Stock Company | COMPANY AS | Ukraine | ||
| AOP | Aeropiloto | AEROPILOTO | Portugal | ||
| VB | VIV | Aeroenlaces Nacionales | AEROENLACES | Mexico | Former ICAO code: AEN |
| VIZ | Aerovis Airlines | AEROVIZ | Ukraine | ||
| VJE | AvJet Routing | United Arab Emirates | |||
| VGF | Aerovista Gulf Express | VISTA GULF | United Arab Emirates | ||
| VER | Almaver | ALMAVER | Mexico | ||
| AOR | Afro International Ent. Limited | INTER-AFRO | Nigeria | ||
| SMX | Alitalia Express | ALIEXPRESS | Italy | ||
| OE | AOT | Asia Overnight Express | ASIA OVERNIGHT | Philippines | |
| AOV | Aero Vision | AEROVISION | France | ||
| AOX | Aerotaxi Del Valle | AEROVALLE | Colombia | ||
| APC | Airpac Airlines, Inc. | AIRPAC | United States | ||
| SVM | Aeroservicios Monterrey | SERVIMONTE | Mexico | ||
| APF | Amapola Flyg AB | AMAPOLA | Sweden | ||
| APH | Alpha Aviation, Inc. | AIRFLIGHT | United States | ||
| API | ASA Pesada, Lda. | ASA PESADA | Angola | ||
| APJ | Peach Aviation | AIR PEACH | Japan | ||
| PET | Aerotransporte Petrolero | AEROPETRO | Colombia | ||
| GV | ARF | Aero Flight | Aero Fox | Germany | defunct |
| BKL | Aircompany Barcol | BARCOL | Russia | ||
| BLA | All Charter Limited | ALL CHARTER | United Kingdom | ICAO code no longer allocated | |
| APL | Appalachian Flying Service, Inc. | APPALACHIAN | United States | ||
| APM | Airpac, Inc. | ALASKA PACIFIC | United States | ||
| APO | Aeropro | AEROPRO | Canada | defunct | |
| APP | AlpAvia d.o.o. | ALPAVIA | Slovenia | ||
| APQ | Aspen Aviation | ASPEN BASE | United States | ||
| APU | Aeropuma, S.A. | AEROPUMA | El Salvador | ||
| JW | APW | Arrow Air | BIG A | United States | defunct |
| APX | Apex Air Cargo | PARCEL EXPRESS | United States | ||
| APY | APA Internacional | APA INTERNACIONAL | Dominican Republic | ||
| AQA | Aeroatlas, S.A. | ATCO | Colombia | ||
| AQL | Aquila Air Ltd. | AQUILA | Canada | ||
| AQO | Aluminum Company Of America | ALCOA SHUTTLE | United States | Alcoa Aircraft Operations | |
| AQT | Avioquintana | AVIOQUINTANA | Mexico | ||
| AQU | AirQuarius Aviation | QUARIUS | South Africa | defunct | |
| AQZ | Aerodyne Charter Company | QUANZA | United States | ||
| ARA | Arik Air | ARIK AIR | Nigeria | ||
| ARB | Avia Air N.V. | AVIAIR | Aruba | ||
| 2B | AWT | Albawings | ALBAWINGS | Albania | |
| 4C | ARE | Aires, Aerovías de Integración Regional, S.A. | AIRES | Colombia | renamed to LAN Colombia |
| AR | ARG | Aerolíneas Argentinas | ARGENTINA | Argentina | |
| ARH | Arrowhead Airways | ARROWHEAD | United States | ||
| ARI | Aero Vics | AEROVICS | Mexico | ||
| SUN | Antillana De Navegación Aérea | Dominican Republic | |||
| SUO | Aeroservicios De San Luis | SERVICIO SANLUIS | Mexico | ||
| SUP | Aerosuper | AEROSUPER | Mexico | ||
| ARK | Aero Link Air Services S.L. | LINK SERVICE | Spain | ||
| ARL | Airlec - Air Aquitaine Transport | AIRLEC | France | ||
| ARM | Aeromarket Express | AMEX | Spain | defunct | |
| ARO | Arrow Aviation Ltd. | ARROW | Canada | defunct | |
| KLD | Air Klaipėda | AIR KLAIPEDA | Lithuania | ||
| ARQ | Armstrong Air, Inc. | ARMSTRONG | Canada | ||
| ARS | Aeromet Servicios | METSERVICE | Chile | ||
| ART | Aerotal Aerolíneas Territoriales de Colombia Ltda. | AEROTAL | Colombia | defunct | |
| ARV | Aravco Ltd. | ARAVCO | United Kingdom | ||
| ARW | Aria | ARIABIRD | France | ||
| OST | Airline Alania | ALANIA | Russia | ||
| HUC | Aerolíneas de Techuacán | LINEAS TEHUACAN | Mexico | ||
| HUT | Aerotransportes Huitzilin | AEROHUITZILIN | Mexico | ||
| HUY | Aero Transportes Del Humaya | AERO HUMAYA | Mexico | ||
| ARY | Argosy Airways | GOSEY | United States | ||
| AS | ASA | Alaska Airlines, Inc. | ALASKA | United States | |
| PL | ASE | Airstars | MOROZOV | Russia | defunct |
| ASF | Air Schefferville, Inc. | SCHEFF | Canada | ||
| ASG | African Star Airways (PTY) Ltd. | AFRICAN STAR | South Africa | ||
| ASI | Aerosun International, Inc. | AEROSUN | United States | ||
| ASM | Awesome Flight Services (PTY) Ltd. | AWESOME | South Africa | ||
| ASO | Aero Slovakia | AERO NITRA | Slovakia | ||
| ASP | Airsprint | AIRSPRINT | Canada | ||
| ASR | All Star Airlines, Inc. | ALL STAR | United States | ||
| AST | Aerolíneas Del Oeste | AEROESTE | Mexico | ||
| WAP | Arrow Panama | ARROW PANAMA | Panama | ||
| ASV | Astravia-Bissau Air Transports Ltd. | ASTRAVIA | Guinea-Bissau | ||
| OB | ASZ | Astrakhan Airlines | AIR ASTRAKHAN | Russia | defunct |
| ATB | Atlantair Ltd. | STARLITE | Canada | ||
| ATD | Aerotours Dominicana | AEROTOURS | Dominican Republic | ||
| ATE | Atlantis Transportation Services, Ltd. | ATLANTIS CANADA | Canada | ||
| ATG | Aerotranscargo[ citation needed ] | MOLDCARGO | Moldova | ||
| HC | ATI | Aero-Tropics Air Services | AEROTROPICS | Australia | defunct |
| ATK | AeroTACA | AEROTACA | Colombia | defunct, Aerotaxi Casanare | |
| ATL | Atlas Air Service AG | AIR BREMEN | Germany | ||
| FO | ATM | Airlines of Tasmania | AIRTAS | Australia | |
| CPV | Air Corporate | AIRCORPORATE | Italy | ||
| ATP | ASTRAL Colombia - Aerotransportes Especiales Ltda. | ASTRAL | Colombia | ||
| FEO | Aeroferinco | FERINCO | Mexico | ||
| FES | Aero Taxis Y Servicios Alfe | AERO ALFE | Mexico | ||
| FFA | Avialesookhrana | AVIALESOOKHRANA | Russia | ||
| FFB | Africair Service | FOXTROT FOXTROT | Senegal | ||
| ATR | Atlas Airlines | ATLAS-AIR | United States | ||
| ATT | Aer Turas | AERTURAS | Ireland | defunct | |
| ATU | Atlant Aerobatics Ltd. | ATLANT HUNGARY | Hungary | ||
| ATV | Avanti Air | AVANTI AIR | Germany | ||
| ATW | Aero Trades (Western) Ltd. | AERO TRADES | Canada | defunct, ICAO code no longer allocated | |
| OS | AUA | Austrian Airlines | AUSTRIAN | Austria | |
| IQ | AUB | Augsburg Airways | AUGSBURG-AIR | Germany | defunct |
| TUP | Aviastar-Tu | TUPOLEVAIR | Russia | ||
| RU | ABW | AirBridge Cargo | AIRBRIDGE CARGO | Russia | Former IATA: BO |
| TUR | ATUR | Ecuador | |||
| TXU | ATESA Aerotaxis Ecuatorianos | ATESA | Ecuador | ||
| TXX | Austin Express | COWBOY | United States | defunct | |
| AUD | Audi Air, Inc. | AUDI AIR | United States | ||
| AUF | Augusta Air Luftfahrtunternehmen | AUGUSTA | Germany | ||
| AUM | Air Atlantic Uruguay | ATLAMUR | Uruguay | ||
| AUN | Aviones Unidos | AVIONES UNIDOS | Mexico | ||
| AUP | Avia Business Group | Russia | |||
| SVE | Aero Servicios Expecializados | AEROESPECIAL | Mexico | ||
| GR | AUR | Aurigny Air Services | AYLINE | United Kingdom | |
| NO | AUS | Aus-Air | AUS-AIR | Australia | defunct |
| AU | AUT | Austral Líneas Aéreas | AUSTRAL | Argentina | |
| AUU | Aurora Aviation, Inc. | AURORA AIR | United States | ICAO code no longer allocated | |
| AUY | Aerolíneas Uruguayas, S.A. | AUSA | Uruguay | ||
| AVF | Aviair Aviation Ltd. | CARIBOO | Canada | ||
| AVH | AV8 Helicopters | KENT HELI | United Kingdom | ||
| AVJ | Avia Traffic Company | ATOMIC | Kyrgyzstan | ||
| AVK | AV8 Helicopters | AVIATE-COPTER | South Africa | ||
| AVM | Aviación Ejecutiva Mexicana, S.A. | AVEMEX | Mexico | ||
| AVO | Aviation at Work | AVIATION WORK | South Africa | ||
| AVP | Avcorp Registrations | AVCORP | United Kingdom | No longer used | |
| AVP | Aviacion Corporativa de Peubla | AVIA PUEBLA | Mexico | ||
| LFP | Alfa Aerospace | ALFA-SPACE | Australia | ||
| LFR | Atlantic Airfreight Aviation | LANFREIGHT | São Tomé and Príncipe | ||
| AVS | Avialsa T-35 | AVIALSA | Spain | ||
| AVT | Asia Avia Airlines | ASIAVIA | Indonesia | defunct | |
| AVU | Avia Sud Aérotaxi | AVIASUD | France | ||
| AVV | Airvantage Incorporated | AIRVANTAGE | United States | ||
| AVW | Aviator Airways | AVIATOR | Greece | ||
| AVX | Aviapaslauga | PASLAUGA | Lithuania | defunct | |
| YRG | Air Yugoslavia | YUGAIR | Serbia | defunct; operations continue under Jat Airways | |
| K8 | ZAK | Airlink Zambia | Zambia | Zambia Skyways Limited | |
| ZZM | Agence Nationale des Aerodromes et de la Meteorologie (ANAM) | Ivory Coast | |||
| 4Y | BGA | Airbus Transport International | BELUGA | France | |
| B9 | BGD | Air Bangladesh | AIR BANGLA | Bangladesh | defunct |
| BGF | Aviodetachment-28 | BULGARIAN | Bulgaria | ||
| BGG | Aero BG | AERO BG | Mexico | ||
| BHC | Aerotaxis De La Bahia | BAHIA | Mexico | ||
| BIV | Aviaservice | AVIASERVICE | Georgia | ||
| SZA | Aerolíneas de El Salvador | AESA | El Salvador | defunct | |
| AVY | Aerovaradero, S.A. | AEROVARADERO | Cuba | ||
| AWB | Airways International, Inc. | AIRNAT | United States | ||
| AWK | Airwork | AIRWORK | New Zealand | ||
| AWL | Australian Wetleasing | AUSSIEWORLD | Australia | ||
| AWO | Awood Air Ltd. | AWOOD AIR | Canada | ||
| AWR | Arctic Wings And Rotors Ltd. | ARCTIC WINGS | Canada | ||
| ISM | Auo Airclub AIST-M | STORK | Russia | ||
| AWS | Arab Wings | ARAB WINGS | Jordan | ||
| AWV | Airwave Transport, Inc. | AIRWAVE | Canada | ||
| AWY | Aeroway, S.L. | AEROWEE | Spain | ||
| AXH | Aeromexhaga | AEROMEXHAGA | Mexico | ||
| AXI | Aeron International Airlines, Inc. | AIR FREIGHTER | United States | ||
| AXK | African Express Airways | EXPRESS JET | Kenya | Former IATA code: QA; former ICAO code: AEK; former callsign: AFRICAN EXPRESS | |
| AK | AXM | AirAsia | RED CAP | Malaysia | ICAO code no longer allocated |
| D7 | XAX | AirAsia X | XANADU | Malaysia | |
| DJ | WAJ | AirAsia Japan | WING ASIA | Japan | defunct |
| I5 | IAD | AirAsia India | ARIYA | India | Founded 28. Mar 2013 |
| AXN | Alexandair | ALEXANDROS | Greece | defunct | |
| AXP | Aeromax | AEROMAX SPAIN | Spain | ||
| BNI | Alberni Airways | ALBERNI | Canada | ||
| BNZ | Aerolíneas Bonanza | AERO BONANZA | Mexico | ||
| BOC | Aerobona | AEROBONA | Mexico | ||
| AXR | Axel Rent, S.A. | RENTAXEL | Mexico | ||
| AXS | Altus Airlines | ALTUS | United States | ||
| AXV | AVA Airlines | AVA | Iran | ||
| AXX | Avioimpex A.D.p.o. | IMPEX | Macedonia | defunct | |
| 6V | AXY | Axis Airways | AXIS | France | defunct |
| AYD | Aladia Airlines | AIRLINES ALADIA | Mexico | defunct | |
| AYK | Aykavia Aircompany | Armenia | ICAO code no longer allocated | ||
| AYM | Airman, S.L. | AIRMAN | Spain | ||
| NPT | West Atlantic UK | NEPTUNE | United Kingdom | ||
| GBN | Atlantic Airlines | ATLANTIC GABON | Gabon | ||
| EX | BJK | Atlantic Airlines | BLACKJACK | United States | |
| HHA | Atlantic Airlines de Honduras | ATLANTIC HONDURAS | Honduras | defunct | |
| AYN | Atlantic Airlines, S.A. | ATLANTIC NICARAGUA | Nicaragua | ||
| AYS | Awsaj Aviation Services | Libya | ICAO code no longer allocated | ||
| AYT | Ayeet Aviation & Tourism | AYEET | Israel | ||
| 3G | AYZ | Atlant-Soyuz Airlines | ATLANT-SOYUZ | Russia | defunct |
| AZ | AZA | Alitalia | ALITALIA | Italy | defunct |
| ZE | AZE | Arcus-Air Logistic | ARCUS AIR | Germany | |
| A2 | AZI | Astra Airlines | ASTRA | Greece | |
| AZK | Azalhelikopter | AZALHELICOPTER | Azerbaijan | ||
| AZL | Africa One | SKY AFRICA | Zambia | defunct | |
| AZM | Aerocozumel | AEROCOZUMEL | Mexico | ||
| AZP | Arizona Pacific Airways | ARIZONA PACIFIC | United States | ||
| AZS | Aviacon Zitotrans Air Company | ZITOTRANS | Russia | ||
| AZT | Azimut, S.A. | AZIMUT | Spain | ||
| AZV | Azov Avia Airlines | AZOV AVIA | Ukraine | defunct, Asov-Avia, Aircompany | |
| MHC | Aero Jomacha | AERO JOMACHA | Mexico | ||
| AZY | Arizona Airways, Inc. | ARIZAIR | United States | ||
| AZZ | Azza Transport | AZZA TRANSPORT | Sudan | ||
| NAR | Air Continental Inc | NIGHT AIR | United States | ||
| NAU | Antanik-Air | ANTANIK | Ukraine | ||
| NER | Air Newark | NEWAIR | United States | ||
| NFF | Aircraft Support and Services | Lebanon | ICAO code no longer allocated | ||
| OBA | Aerobanana | AEROBANANA | Mexico | ||
| OBK | Amako Airlines | AMAKO AIR | Nigeria | ||
| R7 | OCA | Aserca Airlines | AROSCA | Venezuela | |
| NFS | Afrique Cargo Service Senegal | Senegal | defunct | ||
| NGC | Angoservice | ANGOSERVICE | Angola | ||
| NGE | Angel Airlines | ANGEL AIR | Thailand | defunct, ICAO code no longer allocated | |
| NGF | Angel Flight America | ANGEL FLIGHT | United States | Renamed Air Charity Network in 2014 [4] | |
| OUL | Air Atonabee | CITY EXPRESS | Canada | defunct | |
| OVA | Aero Nova | AERONOVA | Spain | ||
| XPE | Amira Air | EXPERT | Austria | ||
| XSS | Aero Express Intercontinental | INTER EXPRESS | Mexico | ||
| TLR | Air Libya Tibesti | AIR LIBYA | Libya | ||
| OVC | Aerovic | Ecuador | |||
| RVE | Airventure | AIRVENTURE | Belgium | ||
| RVI | Aero Servicios | AERO SERVICIOS | Mexico | ||
| RVL | Airvallee | AIR VALLEE | Italy | ||
| OVE | Aeromover | AEROMOVER | Mexico | ||
| OVI | Aerovías Ejecutivas | VIAS EJECUTIVAS | Mexico | ||
| PTD | Aero Servicio Pity | PITY | Mexico | ||
| PTE | Aero Copter | AERO-COP | Mexico | ||
| PLL | Air Pal | AIRPAL | Spain | Escuela De Pilots | |
| PLM | Air Pullmantur | PULLMANTUR | Spain | ||
| RX | AEH | Aviaexpress | AVEX | Hungary | defunct |
| PSG | Aviones Para Servirle | SERVIAVIONES | Mexico | ||
| SLU | Avio Sluzba | AVIO SLUZBA | Serbia | ||
| SCU | Air Scorpio | SCORPIO UNIVERS | Bulgaria | ||
| SIP | Air Spirit | AIR SPIRIT | United States | ||
| BMV | Alatau Airlines | OLIGA | Kazakhstan | ||
| GUG | Aviateca | AVIATECA | Guatemala | ||
| PXX | Aroostook Aviation | PINE STATE | United States | ||
| PYC | Aeropycsa | AEROPYCSA | Mexico | ||
| PVK | Association of Private Pilots of Kazakhstan | BORIS | Kazakhstan | ICAO code no longer allocated | |
| BAS | Aero Services | AEROSERV | Barbados | ||
| BBT | Air Bashkortostan | AGYDAL | Russia | defunct | |
| MCY | Ambulance Air Africa | MERCY | South Africa | ||
| MQ | EGF | American Eagle Airlines | EAGLE FLIGHT | United States | Renamed Envoy Air, ICAO Code and Callsign withdrawn in 2014 |
| PUE | Aeropuelche | PUELCHE | Chile | ||
| PUT | Aeroput | Serbia | defunct | ||
| ZS | AZI | Azzurra Air | AZZURRA | Italy | defunct |
| FF | Airshop | Netherlands | |||
| ML | ETC | African Transport Trading and Investment Company | TRANATTICO | Sudan | |
| XCT | Aero Costa Taxi Aéreo | AEROCOSTAXI | Mexico | ||
| VRO | Aerovitro | AEROVITRO | Mexico | ||
| VRI | Aerotaxi Villa Rica | VILLARICA | Mexico | ||
| VEG | Aerovega | AEROVEGA | Mexico | ||
| VVG | Aerovilla | AEROVILLA | Colombia | ||
| VLR | Aerolíneas Villaverde | VILLAVERDE | Mexico | ||
| WI | WIL | Aero Air | WILLIAMETTE | United States | |
| VEJ | Aero Ejecutivos | VENEJECUTIV | Venezuela | ||
| WAB | Aero Industries Inc | WABASH | United States | ||
| VNG | Aero Servicios Vanguardia | VANGUARDIA | Mexico | ||
| VAD | Aero Taxi Los Valles | VALLES | Spain | ||
| VMR | Aero Vilamoura | AERO VILAMOURA | Portugal | ICAO code no longer allocated | |
| VLS | Aero Virel | VIREL | Mexico | ||
| XAA | Aeronautical Radio Inc | ROCKFISH|United States | |||
| VUO | Aerovuelox | AEROVUELOX | Mexico | ||
| VTM | Aeronaves TSM | AERONAVES TSM | Mexico | ||
| VU | VUN | Air Ivoire | AIRIVOIRE | Ivory Coast | defunct |
| BP | BOT | Air Botswana | BOTSWANA | Botswana | |
| XPR | Air-Rep | United States | |||
| XLL | Air Excel | TINGA-TINGA | Tanzania | ||
| VAE | Air Evans | AIR-EVANS | Spain | Ecuela de Pilotos Privados | |
| WHY | Air Sorel | AIR SOREL | Canada | ||
| WDR | Air Net Private Charter | WIND RIDER | United States | ||
| XEC | Air Executive Charter | Germany | |||
| GS | UPA | Air Foyle | FOYLE | United Kingdom | defunct, ICAO code no longer allocated |
| VTY | Air Midwest (Nigeria) | VICTORY | Nigeria | ||
| VT | VTA | Air Tahiti | AIR TAHITI | French Polynesia | |
| 3N | URG | Air Urga | URGA | Ukraine | |
| VDR | Air Vardar | VARDAR | Macedonia | ICAO code in use by another company, call sign no longer allocated | |
| VL | VIM | Air VIA | CRYSTAL | Bulgaria | |
| WLR | Air Walser | AIRWALSER | Italy | ||
| URA | Aircompany Rosavia | ROSAVIA | Ukraine | ||
| XLB | Aircraft Performance Group | United States | |||
| WLA | Airwaves Airlink | AIRLIMITED | Zambia | ||
| XFX | Airways Corporation of New Zealand | AIRCORP | New Zealand | ||
| WAY | Airways | GARONNE | France | ||
| WGS | Airwings oy | AIRWINGS | Finland | ||
| XAK | Airkenya | SUNEXPRESS | Kenya | ||
| WPK | Air-Lift Associates | WOLFPACK | United States | ||
| VAB | Airtrans Ltd | Russia | |||
| URP | ARP 410 Airlines | AIR-ARP | Ukraine | ||
| WPR | Auckland Regional Rescue Helicopter Trust | WESTPAC RESCUE | New Zealand | ||
| URR | Aurora Airlines | AIR AURORA | Slovenia | defunct, ICAO code no longer allocated | |
| UST | Austro Aéreo | AUSTRO AEREO | Ecuador | ||
| WLT | Aviation Partners | WINGLET | United States | ||
| VLV | Avialift Vladivostok | VLADLIFT | Russia | ||
| VME | Aviación Comercial de América | AVIAMERICA | Mexico | ||
| VVA | Aviast Air | IALSI | Russia | defunct | |
| WLV | Aviation North | WOLVERINE | United States | ||
| FK | WTA | Africa West | WEST TOGO | Togo | |
| VNT | Avient Air Zambia | AVIENT | Zambia | ||
| VZR | Aviazur | IAZUR | France | ||
| VID | Aviaprad | AVIAPRAD | Russia | defunct | |
| G2 | VXG | Avirex | AVIREX-GABON | Gabon | |
| VXX | Aviaexpress Aircompany | EXPRESSAVIA | Ukraine | ||
| XAM | AMR Services Corporation | ALLIANCE | United States | ||
| XAO | Airline Operations Services | United States | |||
| VAZ | Airlines 400 | REMONT AIR | Russia | ||
| V8 | VAS | ATRAN Cargo Airlines | ATRAN | Russian Federation | |
| VAM | Ameravia | AMERAVIA | Uruguay | ||
| K6 | KHV | Angkor Air | AIR ANGKOR | Cambodia | |
| VBC | AVB-2004 Ltd | AIR VICTOR | Bulgaria | ||
| XKX | ASECNA | France | |||
| XAT | AT and T Aviation Division | United States | |||
| CAJ | Air Caraibes Atlantique | CAR LINE | France | ||
| CAO | Air China Cargo | AIRCHINA FREIGHT | China | ||
| CBE | Aerovías Caribe | AEROCARIBE | Mexico | ||
| CBO | Aerotaxi del Cabo | TAXI CABO | Mexico | ||
| CBS | Air Columbus | AIR COLUMBUS | Ukraine | ||
| CBV | Aereo Cabo | CABOAEREO | Mexico | ||
| CA | CCA | Air China | AIR CHINA | China | |
| CDA | Aerocardal | CARDAL | Chile | ||
| Q6 | CDP | Aero Condor Peru | CONDOR-PERU | Peru | |
| CDU | Aerotrans | Russia | |||
| CDV | Airline Skol | SKOL | Russia | ||
| CFF | Aerofan | AEROFAN | Spain | ||
| CFR | Africa One | Democratic Republic of the Congo | defunct | ||
| CFV | Aero Calafia | CALAFIA | Mexico | ||
| CGB | Air Cargo Belize | CARGO BELIZE | Belize | ||
| CGV | Aero Clube Do Algarve | CLUBE ALGARVE | Portugal | ||
| CGW | Air Great Wall | CHANGCHENG | China | defunct | |
| CHJ | Aircompany Chaika | AIR CHAIKA | Ukraine | ||
| CHR | Air Charter Services | ZAIRE CHARTER | Democratic Republic of the Congo | ||
| CHV | Air Charter Professionals | CHARTAIR | United States | ||
| CID | Asia Continental Airlines | ACID | Kazakhstan | defunct, ICAO code no longer allocated | |
| 5F | CIR | Arctic Circle Air Service | AIR ARCTIC | United States | defunct 2011 |
| CKL | Aviation Charter Services | CIRCLE CITY | United States | ||
| CLL | Aerovías Castillo | AEROCASTILLO | Mexico | ||
| CLP | Aero Club De Portugal | CLUB PORTUGAL | Portugal | ||
| CMF | Air Care Alliance | COMPASSION | United States | ||
| CNE | Air Toronto | CONNECTOR | Canada | ||
| CNH | Aquila Air | CHENANGO | United States | ||
| CNU | Air Consul | AIR CONSUL | Spain | ||
| CNX | AllCanada Express | CANEX | Canada | defunct | |
| CPF | Airtechservice | TECHSERVICE | Ukraine | defunct | |
| QC | CRD | Air Corridor | AIR CORRIDOR | Mozambique | defunct |
| NV | CRF | Air Central | AIR CENTRAL | Japan | Ceased operations 2010 |
| CRJ | Air Cruzal | AIR CRUZAL | Angola | ||
| CRP | Aerotransportes Corporativos | AEROTRANSCORP | Mexico | ||
| CRQ | Air Creebec | CREE | Canada | ||
| CTA | Aero Charter and Transport | CHAR-TRAN | United States | ||
| CTE | Air Tenglong | TENGLONG | China | ||
| CTR | Aerolíneas Centauro | CENTAURO | Mexico | ||
| CUO | Aerocuahonte | CUAHONTE | Mexico | ||
| CV | CVA | Air Chathams | CHATHAM | New Zealand | |
| CW | CWM | Air Marshall Islands | AIR MARSHALLS | Marshall Islands | |
| CWP | Australian Customs Service | COASTWATCH | Australia | ||
| CYL | Air One Cityliner | CITYLINER | Italy | ||
| CYO | Air Transport | COYOTE | United States | ||
| CYE | Aerocheyenne | AEROCHEYENNE | Mexico | ||
| AH | DAH | Air Algérie | AIR ALGERIE | Algeria | |
| DAP | Aerovías DAP | DAP | Chile | ||
| DBA | Air Alpha | DOUBLE-A | United States | ||
| DBD | Air Niagara Express | AIR NIAGARA | Canada | ||
| DEF | Aviation Defense Service | TIRPA | France | ||
| DEG | Air Service Groningen | DEGGER | Netherlands | ICAO code and call sign no longer allocated | |
| ER | DHL | Astar Air Cargo | D-H-L | United States | defunct, DHL |
| DHM | Archer Aviation | ARCHER | United Kingdom | ICAO code no longer allocated | |
| DIC | Aeromedica | AEROMEDICA | Mexico | ||
| DIN | Aerodin | AERODIN | Mexico | ||
| DJU | Air Djibouti | AIR DJIB | Djibouti | defunct | |
| EN | DLA | Air Dolomiti | DOLOMITI | Italy | |
| DLS | Aero Modelo | AEROMODELO | Mexico | ||
| DLU | Aerolíneas del Sur | DEL SUR | Chile | defunct | |
| DMC | Aerodinamica de Monterrey | DINAMICAMONT | Mexico | ||
| DMI | Aeroservicios Dinamicos | AERODINAMICO | Mexico | ||
| DML | Aerotaxis Dosmil | Mexico | |||
| DNA | Aerodespachos de El Salvador | AERODESPACHOS | El Salvador | ||
| DNC | Aerodynamics Málaga | FLYINGOLIVE | Spain | ||
| DNJ | Aerodynamics Incorporated | DYNAJET | United States | ||
| NM | DRD | Air Madrid | ALADA AIR | Spain | defunct |
| DRM | Airways Flight Training | DARTMOOR | United Kingdom | ||
| DRO | Aeronaves Del Noreste | AERONORESTE | Mexico | ||
| 6R | DRU | Alrosa Air Company | MIRNY | Russia | |
| DSK | Aero Algarve | SKYBANNER | Portugal | ICAO code no longer allocated | |
| DST | Aex Air | DESERT | United States | ||
| EAT | Air Transport | TRANS EUROPE | Slovakia | ||
| EE | EAY | Aero Airlines | REVAL | Estonia | defunct |
| EBC | Aero Ejecutivo De Baja California | CALIXJET | Mexico | ||
| 4F | ECE | Air City | AIRCITY | Germany | |
| ECG | Aero Ejecutivos RCG | EJECTUIVOS RCG | Mexico | ||
| ECL | Aeronáutica Castellana | AERO CASTELLANA | Spain | ||
| ECM | Aerolíneas Comerciales | AERO COMERCIALES | Mexico | ||
| EDA | Aerolineas Nacionales Del Ecuador | ANDES | Ecuador | defunct | |
| EET | Air Este | AESTE | Spain | ||
| EFC | Air Mana | FLIGHT TAXI | France | ||
| EJP | Aeroservicios Ejecutivos Corporativos | EJECCORPORATIVOS | Mexico | ||
| E8 | ELG | Alpi Eagles | ALPI EAGLES | Italy | defunct, ICAO code no longer allocated |
| ALX | ALPI Jets | ALPIJETS | Austria | ||
| END | Arrendadora y Transportadora Aérea | ARRENDADORA | Mexico | ||
| ENW | Aeronaves Del Noroeste | AERONOR | Spain | ||
| EOL | Airailes | EOLE | France | ||
| RF | EOK | Aero K | AEROHANKUK | South Korea | established in May 2016; commenced operations on 15 April 2021 |
| EOM | Aero Ermes | AERO ERMES | Mexico | ||
| EPL | Aero Transportes Empresariales | EMPRESARIALES | Mexico | ||
| EPE | Aero Empresarial | AEROEMPRESARIAL | Mexico | ||
| KY | EQL | Air São Tomé and Príncipe | EQUATORIAL | São Tomé and Príncipe | defunct |
| ERG | Avianergo | AVIANERGO | Russia | defunct | |
| ERI | Aero Servicios Regiomontanos | ASERGIO | Mexico | ||
| ERK | Aerosec | AEROSEC | Chile | ||
| ERM | Aeromaan | EOMAAN | Mexico | ||
| ESB | Aereosaba | AEREOSABA | Mexico | ||
| ESO | Avitat | United Kingdom | |||
| ESU | Aerolíneas Ejecutivas Del Sureste | ALESUR | Mexico | ||
| ESZ | Aeronáutica La Esperanza | ESPERANZA | Mexico | ||
| ETE | Aero Siete | AEROSIETE | Mexico | ||
| EUK | Air Atlanta Europe | SNOWBIRD | United Kingdom | defunct | |
| EVE | Air Evex | SUNBEAM | Germany | ||
| EVR | Aeronautical Academy of Europe | DIANA | Portugal | ||
| E2/E6 | EWE/EWL | Eurowings Europe | EUROPWINGS BLACK PEARL | Austria | |
| EXG | Air Exchange | EXCHANGE | United States | ||
| FAC | Atlantic Helicopters | FAROECOPTER | Denmark | ||
| FAG | Argentine Air Force | FUAER | Argentina | ||
| PC | FAJ | Air Fiji | FIJIAIR | Fiji | defunct |
| FAN | AF-Air International | FANBIRD | Angola | ||
| FBW | Aviation Data Systems | United States | |||
| FCI | Air Carriers | FAST CHECK | United States | ||
| FCO | Aerofrisco | AEROFRISCO | Mexico | ||
| FCU | Alfa 4 | Mexico | |||
| JH | FDA | Fuji Dream Airlines | FUJI DREAM | Japan | |
| FDS | African Medical and Research Foundation | FLYDOC | Kenya | ||
| FGT | Aero Freight | FREIAERO | Mexico | ||
| FIC | Aerosafin | AEROSAFIN | Mexico | ||
| OF | FIF | Air Finland | AIR FINLAND | Finland | |
| FII | Aerodata Flight Inspection | FLIGHT CHECKER | Germany | ICAO code no longer allocated | |
| FIX | Airfix Aviation | AIRFIX | Finland | ||
| FJ | FJI | Fiji Airways | PACIFIC | Fiji | |
| FLD | Air Falcon | Pakistan | |||
| RC | FLI | Atlantic Airways | FAROELINE | Faroe Islands | |
| FLP | Aeroclub Flaps | AEROCLUB FLAPS | Spain | defunct | |
| QH | FLZ | Aero Leasing | AIR FLORIDA | United States | dba Air Florida |
| FMT | Air Fret De Mauritanie | Mauritania | |||
| FNM | Avio Nord | Italy | |||
| FNO | Aeroflota Del Noroeste | RIAZOR | Spain | ||
| FNX | Aero Fenix | AERO FENIX | France | ICAO code no longer allocated | |
| FPY | African Company Airlines | AFRICOMPANY | Democratic Republic of the Congo | Defunct. [9] ICAO code in use by another company.[ citation needed ] | |
| FRJ | Afrijet Airlines | AFRIJET | Nigeria | ||
| FRK | Afrika Aviation Handlers | AFRIFAST | Kenya | ||
| FRQ | Afrique Chart'air | CHARTER AFRIQUE | Cameroon | ||
| FRT | Aerofreight Airlines | Russia | |||
| FST | Aeros Limited | FAST TRACK | United Kingdom | ICAO code no longer allocated | |
| FTC | Air Affaires Tchad | AFFAIRES TCHAD | Chad | ||
| NY | FXI | Air Iceland | FAXI | Iceland | |
| 2P | GAP | Air Philippines | ORIENT PACIFIC | Philippines | |
| GAU | Aerogaucho | AEROGAUCHO | Uruguay | ||
| GBJ | Aero Business Charter | GLOBAL JET | Germany | ||
| GCF | Aeronor | AEROCARTO | Spain | ||
| GCK | Aerogem Cargo | AEROGEM | Ghana | defunct | |
| GFO | Aerovías del Golfo | AEROVIAS GOLFO | Mexico | ||
| GGL | Aeronáutica | GIRA GLOBO | Angola | ||
| ZX | GGN | Air Georgian | GEORGIAN | Canada | |
| GHL | Aviance UK | HANDLING | United Kingdom | Gatwick Handling | |
| GHN | Air Ghana | AIR GHANA | Ghana | ||
| GIL | African International Transport | AFRICAN TRANSPORT | Guinea | ||
| 2U | GIP | Air Guinee Express | FUTURE EXPRESS | Guinea | |
| GIZ | Africa Airlines | AFRILENS | Guinea | ||
| GLL | Air Gemini | TWINS | Angola | ||
| GLT | Aero Charter | GASLIGHT | United States | ||
| GME | Aguilas Mayas Internacional | MAYAN EAGLES | Guatemala | ||
| GMM | Aerotaxis Guamuchil | AEROGUAMUCHIL | Mexico | ||
| GMS | Aeroservicios Gama | SERVICIOS GAMA | Mexico | ||
| 0A | GNT | Amber Air | GINTA | Lithuania | |
| GOA | Alberta Government | ALBERTA | Canada | ||
| GRE | Air Scotland | GREECE AIRWAYS | Greece | ||
| DA | GRG | Air Georgia | AIR GEORGIA | Georgia | |
| GRI | Air Cargo Center | São Tomé and Príncipe | |||
| LL | GRO | Allegro | ALLEGRO | Mexico | defunct (IATA code reallocated) |
| GRR | Agroar - Trabalhos Aéreos | AGROAR | Portugal | ||
| GRX | Aircompany Grodno | GRODNO | Belarus | ||
| GSP | Airlift Alaska | GREEN SPEED | United States | ||
| GSV | Agrocentr-Avia | AGRAV | Kazakhstan | ||
| GTC | Altin Havayolu Tasimaciligi Turizm Ve Ticaret | GOLDEN WINGS | Turkey | ||
| 5Y | GTI | Atlas Air | GIANT | United States | |
| GTP | Aerotaxi Grupo Tampico | GRUPOTAMPICO | Mexico | ||
| GUA | Aerotaxis de Aguascalientes | AGUASCALIENTES | Mexico | ||
| GG | GUY | Air Guyane | GREEN BIRD | French Guiana | |
| GVI | Air Victoria Georgia | IRINA | Georgia | ||
| H9 | HAD | Air d'Ayiti | HAITI AVIA | Haiti | |
| GG | HAH | Air Comores International | AIR COMORES | Comoros | |
| HAT | Air Taxi | TAXI BIRD | France | ||
| HEI | Aerohein | AEROHEIN | Chile | ||
| HGH | Atlantic Air Lift | HIGHER | France | ||
| HID | Aviación Ejecutiva De Hildago | EJECUTIVA HIDALGO | Mexico | ||
| HJA | Air Haiti | AIRHAITI | Haiti | ||
| HD | HLN | Air Holland | ORANGE | Netherlands | defunct |
| HJT | Al Rais Cargo | AL-RAIS CARGO | United Arab Emirates | ||
| HKH | Air-Invest | HAWKHUNGARY | Hungary | ||
| HMA | Air Tahoma | TAHOMA | United States | ICAO code no longer allocated | |
| HMT | Air Nova | HAMILTON | United Kingdom | ICAO code no longer allocated | |
| HOM | Aero Homex | AERO HOMEX | Mexico | ||
| HPO | Almiron Aviation | ALMIRON | Uganda | ||
| HQO | Avinor | Norway | |||
| HYR | Airlink Airways | HIGHFLYER | Ireland | ||
| 8C | HZT | Air Horizon | HORIZON TOGO | Togo | |
| ICM | Air Inter Cameroun | INTER-CAMEROUN | Cameroon | ||
| IFI | Air Lift | HELLAS LIFT | Greece | ||
| IKM | Aero Survey | EASY SHUTTLE | Ghana | Callsign changed from GHANA SURVEY | |
| ILK | Aero Airline | ILEK | Kazakhstan | ||
| IME | Airtime Charters | AIRTIME | United Kingdom | ICAO code no longer allocated | |
| IMN | Aerotaxis Cimarron | TAXI CIMARRON | Mexico | ||
| INA | Aero Internacional | AERO-NACIONAL | Mexico | ||
| ING | Aeroingenieria | AEROINGE | Chile | defunct | |
| INO | Aeroservicios Intergrados de Norte | INTENOR | Mexico | ||
| IPL | Airpull Aviation | IPULL | Spain | ||
| IRD | Arvand Airlines | ARVAND | Iran | ||
| IRH | Atlas Aviation Group | ATLAS AVIA | Iran | ||
| IRW | Aram Airline | ARAM | Iran | ||
| IRX | Aria Tour | ARIA | Iran | ||
| ITE | Aerotaxi S.R.O. | AEROTAXI | Czech Republic | ||
| ITF | Avita-Servicos Aéreos | AIR AVITA | Angola | ||
| ITI | AirSwift | AIRSWIFT | Philippines | ||
| ITO | Aero Citro | AERO CITRO | Mexico | ||
| IVE | Air Executive | COMPANY EXEC | Spain | ||
| IWS | Aviainvest | Russia | |||
| W9 | JAB | Air Bagan | AIR BAGAN | Myanmar | |
| JAD | Aerojal | AEROJAL | Mexico | ||
| JAR | Airlink | AIRLINK | Austria | ||
| JEE | Ambjek Air Services | AMBJEK AIR | Nigeria | ||
| JKH | JETKONTOR AG | JETKONTOR | Germany | ||
| UTX | Avfinity | United States | |||
| JMR | Alexandair | ALEXANDAIR | Canada | ||
| JMX | Air Jamaica Express | JAMAICA EXPRESS | Jamaica | ||
| JOA | Air Swift Aviation | Australia | |||
| JOB | Aerojobeni | JOBENI | Mexico | ||
| IP | JOL | Atyrau Air Ways | EDIL | Kazakhstan | |
| JPR | Aerosmith Aviation | JASPER | United States | ICAO code no longer allocated | |
| JTS | Arrendamiento de Aviones Jets | AVIONESJETS | Mexico | ||
| JUA | Aero Juarez | JUAREZ | Mexico | ||
| QK | JZA | Air Canada Jazz | JAZZ | Canada | |
| KAA | Asia Aero Survey and Consulting Engineers | AASCO | Republic of Korea | ICAO code no longer allocated | |
| KAD | Air Kirovograd | AIR KIROVOGRAD | Ukraine | ||
| KAM | Air Mach | ICO-AIR | Italy | ||
| KAV | Air Kufra | AIRKUFRA | Libya | ||
| KEK | Arkhabay | ARKHABAY | Kazakhstan | ICAO code no longer allocated | |
| KFK | Aero Charter Krifka | KRIFKA AIR | Austria | ||
| KFT | Air Kraft Mir | AIR KRAFT MIR | Uzbekistan | ||
| KGD | Air Concorde | CONCORDE AIR | Bulgaria | ||
| KHH | Alexandria Airlines | Egypt | |||
| KIE | Afit | TWEETY | Germany | ||
| KKB | Air South | KHAKI BLUE | United States | ||
| KK | KKK | Atlasjet | ATLASJET | Turkey | |
| KLB | Air Mali International | TRANS MALI | Mali | ||
| KLZ | Aerokaluz | AEROKALUZ | Mexico | ||
| JS | KOR | Air Koryo | AIR KORYO | Democratic People's Republic of Korea | |
| KOY | Araiavia | ALEKS | Kazakhstan | ||
| KRE | AeroSucre | AEROSUCRE | Colombia | ||
| KRT | Air Kokshetau | KOKTA | Kazakhstan | ICAO code no longer allocated | |
| KSI | Air Kissari | KISSARI | Angola | ||
| KTN | Aeronavigaciya | AERONAVIGACIYA | Ukraine | ||
| KVR | Alliance Avia | KAVAIR | Kazakhstan | ||
| KYC | Av Atlantic | DOLPHIN | United States | ||
| KC | KZR | Air Astana | ASTANALINE | Kazakhstan | |
| LAG | Aviation Legacy | AVILEG | Gambia | ||
| Aerovías De Lagos | AEROLAGOS | Mexico | Was LAG | ||
| LV | LBC | Albanian Airlines | ALBANIAN | Albania | |
| LBI | Albisa | ALBISA | Mexico | ||
| LBW | Albatros Airways | ALBANWAYS | Albania | ||
| LDG | Aerolíneas Aéreas Ejecutivas De Durango | DURANGO | Mexico | ||
| 3S | BOX | Aerologic | GERMAN CARGO | Germany | |
| LDN | Al-Donas Airlines | ALDONAS AIR | Nigeria | ||
| QP | AKJ | Akasa Air | AKASA AIR | India | |
| LDR | Aero Lider | AEROLIDER | Mexico | ||
| LEM | Aleem | Egypt | |||
| LET | Aerolíneas Ejecutivas | MEXEJECUTIV | Mexico | ||
| H7 | LFA | Air Alfa | AIR ALFA | Turkey | |
| LFC | Aero Control Air | LIFE FLIGHT CANADA | Canada | defunct | |
| LGN | Aerolaguna | AEROLAGUNA | Mexico | ||
| LHR | Al Ahram Aviation | AL AHRAM | Egypt | ||
| D4 | LID | Alidaunia | ALIDA | Italy | |
| LIE | Al-Dawood Air | AL-DAWOOD AIR | Nigeria | ||
| LKP | American Aviation | LAKE POWELL | United States | ICAO code no longer allocated | |
| LKS | Airlink Solutions | AIRLIN | Spain | ||
| LKY | Air Solutions | LUCKY | United States | ||
| 9I | LLR | Air India Regional | ALLIED | India | |
| LMA | Aerolima | AEROLIMA | Mexico | ||
| LML | Alamia Air | ALAMIA AIR | Libya | ICAO code no longer allocated | |
| LMP | Air Plus Argentina | AIR FLIGHT | Argentina | ||
| LMT | Almaty Aviation | ALMATY | Kazakhstan | ||
| LMX | Aerolíneas Mexicanas J S | LINEAS MEXICANAS | Mexico | ||
| LMY | Air Almaty | AGLEB | Kazakhstan | ||
| LMZ | Air Almaty ZK | ALUNK | Kazakhstan | ||
| XL | LNE | Aerolane | AEROLANE | Ecuador | Líneas Aéreas Nacionales Del Ecuador |
| 4Z | LNK | Airlink | LINK | South Africa | |
| LNT | Aerolíneas Internacionales | LINEAINT | Mexico | ||
| LOK | Alok Air | ALOK AIR | Sudan | ||
| LOU | Air Saint Louis | AIR SAINTLOUIS | Senegal | ||
| FL | LPA | Air Leap | LEAP | Sweden | [ citation needed ] |
| LPC | Alpine Aviation | NETSTAR | South Africa | ||
| A6 | LPV | Air Alps Aviation | ALPAV | Austria | |
| LRO | Alrosa-Avia | ALROSA | Russia | ||
| LRW | Al Rida Airways | AL RIDA | Mauritania | ||
| LSK | Aurela | AURELA | Lithuania | ||
| LSM | Aerobusinessservice | Russia | defunct | ||
| LSR | Alsair | ALSAIR | France | ||
| LTI | Aerotaxis Latinoamericanos | LATINO | Mexico | ||
| LUC | Albinati Aeronautics | ALBINATI | Switzerland | ||
| TD | LUR | Atlantis European Airways | ATLANTIS | Armenia | defunct |
| LVN | Aliven | ALIVEN | Italy | ||
| LVR | Aviavilsa | AVIAVILSA | Lithuania | ||
| L8 | LXG | Air Luxor GB | LUXOR GOLF | Guinea-Bissau | |
| LK | LXR | Air Luxor | AIRLUXOR | Portugal | ICAO code no longer allocated |
| LYT | Apatas Air | APATAS | Lithuania | ||
| LZP | Air Ban | DOC AIR | Bulgaria | ||
| LZR | Air Lazur | LAZUR BEE-GEE | Bulgaria | ||
| MAM | Aeródromo De La Mancha | AEROMAN | Spain | ||
| MK | MAU | Air Mauritius | AIRMAURITIUS | Mauritius | |
| MBA | Avag Air | AVAG AIR | Austria | ||
| MBB | Air Manas | AIR MANAS | Kyrgyzstan | ||
| MBC | Airjet Exploracao Aerea de Carga | MABECO | Angola | ||
| MBV | Aeriantur-M | AEREM | Moldova | defunct | |
| MCB | Air Mercia | WESTMID | United Kingdom | ||
| MCD | Air Medical | AIR MED | United Kingdom | ||
| MCO | Aerolíneas Marcos | MARCOS | Mexico | ||
| MDC | Atlantic Aero and Mid-Atlantic Freight | NIGHT SHIP | United States | ||
| MD | MDG | Air Madagascar | AIR MADAGASCAR | Madagascar | |
| MDX | Aerosud Charter | MEDAIR | South Africa | ||
| MEF | Air Meridan | EMPENNAGE | Nigeria | ||
| MFL | Aero McFly | MCFLY | Mexico | ||
| MGE | Asia Pacific Airlines | MAGELLAN | United States | ||
| MGS | Aeromagar | AEROMAGAR | Mexico | ||
| MIE | Aero Premier De Mexico | AEROPREMIER | Mexico | ||
| 9U | MLD | Air Moldova | AIR MOLDOVA | Moldova | |
| MLF | Amal Airlines | AMAL | Djibouti | ||
| L9 | MLI | Air Mali | AIR MALI | Mali | defunct |
| MLN | Air Madeleine | AIR MADELEINE | Canada | ||
| MMC | Aermarche | AERMARCHE | Italy | ||
| MMD | Air Alsie | MERMAID | Denmark | ||
| MMM | Aviation Company Meridian | AVIAMERIDIAN | Russia | ||
| MMP | AMP Incorporated | AMP-INC | United States | ||
| MMX | Airmax | PERUMAX | Peru | ||
| MNE | Aerolíneas Amanecer | AEROAMANECER | Mexico | ||
| MNG | Aero Mongolia | AERO MONGOLIA | Mongolia | ||
| MOC | Air Monarch Cargo | MONARCH CARGO | Mexico | ||
| MOP | Aeropublicitaria De Angola | PUBLICITARIA | Angola | ||
| MOR | Aerolíneas De Morelia | AEROMORELIA | Mexico | ||
| A7 | MPD | Air Plus Comet | RED COMET | Spain | |
| QO | MPX | Aeromexpress | AEROMEXPRESS | Mexico | |
| MQT | Air ITM | MUSKETEER | France | ||
| MRL | Aeromorelos | AEROMORELOS | Mexico | ||
| MRM | Aerocharter | MARITIME | Canada | ||
| MR | MRT | Air Mauritanie | MIKE ROMEO | Mauritania | |
| SM | MSC | Air Cairo | AIR CAIRO | Egypt | |
| MSK | Air Sport | AIR SPORT | Bulgaria | ||
| MSM | Aeromas | AEROMAS EXPRESS | Uruguay | ||
| MSO | Aerolíneas Mesoamericanas | MESO AMERICANAS | Mexico | ||
| MSV | Aero-Kamov | AERAFKAM | Russia | ||
| MTB | Aerotaxis Metropolitanos | AEROMETROPOLIS | Mexico | ||
| MTE | Aeromet Línea Aérea | AEROMET | Chile | defunct | |
| MTK | Air Metack | AIRMETACK | Angola | ||
| MTY | Air Montegomery | MONTY | United Kingdom | ICAO code no longer allocated | |
| MXO | Aerotaxi Mexicano | MAXAERO | Mexico | ||
| MYS | Aero Yaqui Mayo | AERO YAQUI | Mexico | ||
| MZK | AVC Airlines | Japan | |||
| MZL | Aerovías Montes Azules | MONTES AZULES | Mexico | ||
| 2V* | Amtrak | United States | Train services only | ||
| F4 | NBK | Albarka Air | AL-AIR | Nigeria | |
| NEL | Aero Servicios de Nuevo Laredo | AEROLAREDO | Mexico | ||
| NGV | Angoavia | ANGOAVIA | Angola | ||
| NID | Aeroni | AERONI | Mexico | ||
| NIE | Aeroejecutiva Nieto | AERONIETO | Mexico | ||
| AJ | NIG | Aero Contractors | AEROLINE | Nigeria | |
| NKZ | Aerokuzbass | NOVOKUZNETSK | Russia | ||
| NRE | Aviones Are | AVIONES ARE | Mexico | ||
| NRS | Atlantic Richfield Company | NORTH SLOPE | United States | ||
| NSO | Aerolíneas Sosa | SOSA | Honduras | ||
| NTD | Aero Norte | Mexico | |||
| NTV | Air Inter Ivoire | INTER-IVOIRE | Ivory Coast | ||
| NUL | Aeroservicios De Nuevo Leon | SERVICIOS NUEVOLEON | Mexico | ||
| NVI | Avial NV Aviation Company | NEW AVIAL | Russia | ||
| NWG | Airwing | NORWING | Norway | ||
| NXA | Air Next | BLUE-DOLPHIN | Japan | ||
| OAO | Arkhangelsk 2 Aviation Division | DVINA | Russia | ||
| OGI | Aerogisa | AEROGISA | Mexico | ||
| OLV | Aerolíneas Olve | OLVE | Mexico | ||
| OMG | Aeromega | OMEGA | United Kingdom | ||
| ONR | Air One Nine | EDER | Libya | ICAO code no longer allocated | |
| ONT | Air Ontario | ONTARIO | Canada | ||
| ORP | Aerocorp | CORPSA | Mexico | IATA changed to RCP; callsign changed to AEROCORPSA | |
| OSN | Aerosan | AEROSAN | Mexico | ||
| OSO | Aviapartner Limited Company | Russia | |||
| PAJ | Aliparma | ALIPARMA | Italy | ||
| PBT | Air Parabet | PARABET | Bangladesh | ||
| 8Y | PBU | Air Burundi | AIR-BURUNDI | Burundi | |
| PCG | Aeropostal Cargo de Mexico | POSTAL CARGO | Mexico | ||
| PCK | Air Pack Express | AIRPACK EXPRESS | Spain | ||
| PCS | Air Palace | AIR PALACE | Mexico | ||
| OT | PEL | Aeropelican Air Services | PELICAN | Australia | |
| PEV | Peoples Vienna Line | PEOPLES | Austria | ||
| PFI | Aerolíneas Chihuahua | PACIFICO CHIHUAHUA | Mexico | ||
| PFT | Air Cargo Express International | PROFREIGHT | United States | ||
| PHR | Al Farana Airline | PHARAOH | Egypt | ||
| PHW | Ave.com | PHOENIX SHARJAH | United Arab Emirates | ICAO code no longer allocated | |
| PIE | Air South West | PIRATE | United Kingdom | ||
| PIF | Aeroservicios California Pacifico | AEROCALPA | Mexico | ||
| PKA | AST Pakistan Airways | PAKISTAN AIRWAY | Pakistan | ||
| PNL | Aero Personal | AEROPERSONAL | Mexico | ||
| PNU | Aero Servicios Platinum | AERO PLATINUM | Mexico | ||
| POY | Apoyo Aéreo | APOYO AEREO | Mexico | ||
| PRT | Atlantic Coast Jet | PATRIOT | United States | ||
| AD | PRZ | Air Paradise International | RADISAIR | Indonesia | Defunct 2005 |
| PZA | Aéreo Taxi Paraza | AEREO PARAZA | Mexico | ||
| QD | QCL | Air Class Líneas Aéreas | ACLA | Uruguay | |
| QEA | Aviation Consultancy Office | Australia | |||
| QAT | Aero Taxi | AIR QUASAR | Canada | defunct | |
| QKC | Aero Taxi Aviation | QUAKER CITY | United States | ||
| QLA | Aviation Quebec Labrador | QUEBEC LABRADOR | Canada | ||
| QS | QSC | African Safari Airways | ZEBRA | Kenya | |
| QUI | Aero Quimmco | QUIMMCO | Mexico | ||
| RAD | Alada | AIR ALADA | Angola | ||
| RAI | Aerotur Air | DIASA | Kazakhstan | ||
| RAP | Air Center Helicopters | RAPTOR | United States | ||
| RBE | Aur Rum Benin | RUM BENIN | Benin | ||
| RBJ | Aeroserivios Del Bajio | AEROBAJIO | Mexico | ||
| 4Y | RBU | Airbus France | AIRBUS FRANCE | France | |
| RBV | Air Roberval | AIR ROBERVAL | Canada | ||
AG | ARU | Aruba Airlines | ARUBA | Aruba | |
| RCC | Air Charters Eelde | RACER | Netherlands | ICAO code and call sign no longer allocated | |
| RCE | Aerocer | AEROCER | Mexico | ||
| RCF | Aeroflot-Cargo | AEROFLOT-CARGO | Russia | ||
| MC | RCH | Air Mobility Command | REACH | United States | United States Air Force |
| RCI | Air Cassai | AIR CASSAI | Angola | ||
| RCO | Aero Renta De Coahuila | AEROCOAHUILA | Mexico | ||
| RCP | Aerocorp | AEROCORPSA | Mexico | ||
| RCQ | Aerolíneas Regionales | REGIONAL CARGO | Mexico | ||
| RCU | Atlantic S.L. | AIR COURIER | Spain | ||
| RCX | Air Service Center | SERVICE CENTER | Italy | ||
| RDM | Air Ada | AIR ADA | Mauritania | ||
| RE | REA | Aer Arann | AER ARANN | Ireland | |
| REN | Aero-Rent | AERORENT | Mexico | ||
| RES | Australian Maritime Safety Authority | RESCUE | Australia | ||
| UU | REU | Air Austral | REUNION | France | |
| REY | Aero-Rey | AEROREY | Mexico | ||
| RFC | Aero Africa | AERO AFRICA | Eswatini | ||
| ZP | AZP | Amaszonas Paraguay | GUARANI | Paraguay | |
| RFD | Aerotransportes Rafilher | RAFHILER | Mexico | ||
| RGO | Argo | ARGOS | Dominican Republic | ||
| RGR | Avior Regional | AVIOR REGIONAL | Venezuela | 2014 [1] | |
| RGT | Airbourne School of Flying | AIRGOAT | United Kingdom | ICAO code no longer allocated | |
| RHL | Air Archipels | ARCHIPELS | France | ||
| RIF | Aviation Ministry of the Interior of the Russian Federation | INTERMIN AVIA | Russian Federation | ||
| RIS | Aeris Gestión | AERIS | Spain | ||
| 6K | RIT | Asian Spirit | ASIAN SPIRIT | Philippines | |
| RJS | Aeroservicios Jet | ASERJET | Mexico | ||
| RKA | Air Afrique | AIRAFRIC | Ivory Coast | ||
| A5 | RLA | Airlinair | AIRLINAIR | France | |
| NZ | RLK | Air Nelson | NELSON | New Zealand | defunct |
| RLL | Air Leone | AEROLEONE | Sierra Leone | ||
| QL | RLN | Aero Lanka | AERO LANKA | Sri Lanka | |
| RLZ | Air Alize | ALIZE | France | ||
| RMD | Air Amder | AIR AMDER | Mauritania | ||
| R3 | RME | Armenian Airlines | ARMENIAN | Armenia | defunct |
| MV | RML | Air Mediterranean | HELLASMED | Greece | |
| RMO | Arm-Aero | ARM-AERO | Armenia | ||
| RMX | Air Max | AEROMAX | Bulgaria | ||
| 2O | RNE | Air Salone | AIR SALONE | Sierra Leone | |
| RNM | Aeronem Air Cargo | AEROMNEM | Ecuador | ||
| RNR | Air Cargo Masters | RUNNER | United States | ||
| U8 | RNV | Armavia | ARMAVIA | Armenia | defunct, ICAO code no longer allocated |
| ROE | Aeroeste | ESTE-BOLIVIA | Bolivia | ||
| ROH | Aero Gen | AEROGEN | Mexico | ||
| ROI | Avior Airlines | AVIOR | Venezuela | ||
| ROL | Aeroel Airways | AEROEL | Israel | ICAO code no longer allocated | |
| BQ | ROM | Aeromar Lineas Aereas Dominicanas | BRAVO QUEBEC | Dominican Republic | defunct |
| ROO | Aeroitalia | AEROITALIA | Italy | defunct | |
| ROD | Aerodan | AERODAN | Mexico | ||
| P5 | RPB | AeroRepública | AEROREPUBLICA | Colombia | |
| RPC | Aerolíneas Del Pacífico | AEROPACSA | Ecuador | ||
| RRC | Aero Roca | AEROROCA | Mexico | ||
| RRE | Aerotransportes Internacionales De Torreon | AERO TORREON | Mexico | ||
| RSC | Aerolíneas Ejecutivas Tarascas | TARASCAS | Mexico | ||
| E4 | RSO | Aero Asia International | AERO ASIA | Pakistan | defunct |
| BF | RSR | Aero-Service | CONGOSERV | Republic of the Congo | |
| 5L | RSU | AeroSur | AEROSUR | Bolivia | |
| RTE | Aeronorte | LUZAVIA | Portugal | ICAO code no longer allocated | |
| RTH | Artis | ARTHELICO | France | ||
| RTO | Arhabaev Tourism Airlines | ARTOAIR | Kazakhstan | ||
| RTQ | Air Turquoise | TURQUOISE | France | ||
| RTU | Aerotucan | AEROTUCAN | Mexico | ||
| RUD | Air Anastasia | ANASTASIA | Ukraine | ||
| RUM | Air Rum | AIR RUM | Sierra Leone | ||
| RVP | Air VIP | AEROVIP | Portugal | ||
| RVT | Aircompany Veteran | AIR-VET | Armenia | ||
| RWB | Alliance Express Rwanda | Rwanda | Formerly Air Rwanda, revived as RwandAir after the Rwandan Genocide | ||
| RWC | Arrow Ecuador Arrowec | ARROWEC | Ecuador | ||
| RWY | Aerogroup 98 Limited | TYNWALD | United Kingdom | ICAO code no longer allocated | |
| RXT | Aeroxtra | AERO-EXTRA | Mexico | ||
| RWS | Air Whitsunday | Australia | |||
| RZL | Aero Zambia | AERO ZAMBIA | Zambia | ||
| RZN | Aero Zano | ZANO | Mexico | ||
| RZZ | Anoka Air Charter | RED ZONE | United States | ||
| SBH | Aerosaab | AEROSAAB | Mexico | ||
| SCD | Associated Aviation | ASSOCIATED | Nigeria | ||
| SCM | American Jet International | SCREAMER | United States | ||
| EX | SDO | Air Santo Domingo | AERO DOMINGO | Dominican Republic | |
| SDP | Aero Sudpacifico | SUDPACIFICO | Mexico | ||
| SEF | Aero Servicios Ejecutivas Del Pacifico | SERVIPACIFICO | Mexico | ||
| JR | SER | Aero California | AEROCALIFORNIA | Mexico | |
| SGV | Aerosegovia | SEGOVIA | Nicaragua | ||
| SHH | Airshare Holdings | AIRSHARE | United Kingdom | ICAO code no longer allocated | |
| SIY | Aerosiyusa | SIYUSA | Mexico | ||
| SIZ | Aero Silza | AEROSILZA | Mexico | ||
| SJN | Air San Juan | SAN JUAN | United States | ||
| SKP | Aero-North Aviation Services | SKIPPER | Canada | defunct | |
| SMI | Aero Sami | SAMI | Mexico | ||
| Z3 | SMJ | Avient Aviation | AVAVIA | Zimbabwe | |
| SOD | Aerolíneas Sol | ALSOL | Mexico | ||
| SOE | Air Soleil | AIR SOLEIL | Mauritania | ||
| SOG | Aero Soga | AEROSOGA | Guinea-Bissau | defunct | |
| SPD | Airspeed Aviation | SPEEDLINE | Canada | ICAO code no longer allocated | |
| M3 | SPJ | Air Service | AIR SKOPJE | Macedonia | |
| SPO | Aeroservicios Ejecutivos Del Pacifico | EJECTUIV PACIFICO | Mexico | ||
| SPY | Asian Aerospace Service | THAI SPACE | Thailand | ||
| SPZ | Airworld | SPEED SERVICE | South Africa | ||
| SQR | Alsaqer Aviation | ALSAQER AVIATION | Libya | ICAO code no longer allocated | |
| SRI | Air Safaris and Services | AIRSAFARI | New Zealand | ||
| SRV | Aero Servicio Corporativo | SERVICORP | Mexico | ||
| SSL | Air Sultan | SIERRA SULTAN | Sierra Leone | ||
| SSM | Aero 1 Pro-Jet | RAPID | Canada | defunct | |
| SSN | Airquarius Air Charter | SUNSTREAM | South Africa | ICAO code no longer allocated | |
| STK | Aeropac | SAT PAK | United States | ||
| STT | Air St. Thomas | PARADISE | United States | ||
| SUE | Aerolíneas Del Sureste | AEROSURESTE | Mexico | ||
| 8D* | SUW | Astair | Russian Federation | Name changed to Interavia Airlines | |
| SUY | Aerial Surveys (1980) Limited | SURVEY | New Zealand | ||
| GM | SVK | Air Slovakia | SLOVAKIA | Slovakia | ICAO code no longer allocated |
| R3 | SYL | Aircompany Yakutia | AIR YAKUTIA | Russia | |
| SYT | Aerosud Aviation | SKYTRACK | South Africa | ||
| HC | SZN | Air Senegal | AIR SENEGAL | Senegal | |
| TAA | Aeroservicios de La Costa | AERO COSTA | Mexico | ||
| VW | TAO | Aeromar | TRANS-AEROMAR | Mexico | |
| TBL | Aerotrebol | AEROTREBOL | Mexico | ||
| TBO | Aero Taxi de Los Cabos | AERO CABOS | Mexico | ||
| JY | TCI | Air Turks and Caicos | KERRMONT | Turks and Caicos Islands | ICAO code no longer allocated |
| TCO | Aerotranscolombina de Carga | TRANSCOLOMBIA | Colombia | ||
| TDG | Air Cargo Express | TURBO DOG | United States | ||
| TDT | Atlas Helicopters | TRIDENT | United Kingdom | ||
| TDY | Air Today | AIR TODAY | United States | ||
| TED | Aero Servicios Azteca | AEROAZTECA | Mexico | ||
| TIR | Antair | ANTAIR | Mexico | ||
| TLD | Aereo Taxi Autlan | AEREO AUTLAN | Mexico | ||
| TLE | Aero Util | AEROUTIL | Mexico | ||
| TLU | Aero Toluca Internactional | AEROTOLUCA | Mexico | ||
| TME | Aero Taxi del Centro de Mexico | TAXICENTRO | Mexico | ||
| TOC | Aerotropical | TROPICMEX | Mexico | ||
| TOH | Air Tomisko | TOMISKO CARGO | Serbia | ||
| CG | TOK | Airlines PNG | BALUS | Papua New Guinea | |
| TON | Aero Tonala | AEROTONALA | Mexico | ||
| TPB | Aero Tropical | AERO TROPICAL | Angola | ||
| TY | TPC | Air Calédonie | AIRCAL | France | |
| TPK | Air Horizon | TCHAD-HORIZON | Chad | ||
| TPO | Aero Taxi del Potosi | TAXI-POTOSI | Mexico | ||
| TQS | Aeroturquesa | AEROTURQUESA | Mexico | ||
| TRH | Airmark Aviation | TRANSTAR | United States | ||
| FL | TRS | AirTran Airways | CITRUS | United States | defunct, last flight 12/30/2014, now part of Southwest Airlines |
| TS | TSC | Air Transat | AIR TRANSAT | Canada | |
| TSQ | airtransse | AIRTRA | Japan | ||
| TTB | Aerolíneas Turísticas del Caribe | AERO TURISTICAS | Mexico | ||
| TTE | Avcenter | TETON | United States | ||
| TUN | Air Tungaru | TUNGARU | Kiribati | defunct | |
| EC | TWN | Avialeasing Aviation Company | TWINARROW | Uzbekistan | |
| TXD | Aerotaxis del Noroeste | TAXI OESTE | Mexico | ||
| TXF | Aerotaxis Alfe | ALFE | Mexico | ||
| TXI | Aereotaxis | AEREOTAXIS | Mexico | ||
| TZA | Aero Tomza | AERO TOMZA | Mexico | ||
| TZT | Air Zambezi | ZAMBEZI | Zimbabwe | ||
| UAG | Afra Airlines | AFRALINE | Ghana | ||
| UAR | Aerostar Airlines | AEROSTAR | Ukraine | ||
| UCK | Air Division of the Eastern Kazakhstan Region | GALETA | Kazakhstan | ||
| U7 | UGA | Air Uganda | UGANDA | Uganda | |
| UED | Air LA | AIR L-A | United States | ||
| 6U | UKR | Air Ukraine | AIR UKRAINE | Ukraine | |
| UMB | Air Umbria | AIR UMBRIA | Italy | ||
| UND | Atuneros Unidos de California | ATUNEROS UNIDOS | Mexico | ||
| USC | AirNet Express | STAR CHECK | United States | Renamed from US Check Airlines | |
| VNR | Avantair | AVANTAIR | United States | defunct | |
| VTG | Aviação Transportes Aéreos e Cargas | ATACARGO | Angola | ||
| WAS | Air-Watania | Iraq | |||
| AAJ | Alfa Airlines | ALFA SUDAN | Sudan | ||
| KO | AER | Alaska Central Express | ACE AIR | United States | |
| AAK | Alaska Island Air | ALASKA ISLAND | United States | ||
| KH | AAH | Aloha Air Cargo | ALOHA | United States | |
| AQ | AAH | Aloha Airlines | ALOHA | United States | defunct; former IATA code: TS |
| AA | AAL | American Airlines | AMERICAN | United States | |
| XFS | American Flight Service Systems | United States | |||
| XMG | AMS Group | Russia | |||
| WD* | AAN | Amsterdam Airlines | AMSTEL | Netherlands | Former IATA code: FH*. ICAO code and call sign no longer allocated |
| ABI | Antigua and Barbuda Airways | Anair | Antigua and Barbuda | defunct | |
| HO | DJA | Antinea Airlines | ANTINEA | Algeria | defunct |
| EDY | Apollo Air Service | STOBART | United Kingdom | Was VLL Limited | |
| SRY | As-Aero | Armenia | |||
| OZ | AAR | Asiana Airlines | ASIANA | South Korea | |
| XXX | ASL (Air Service Liege) | Belgium | |||
| AG | ABR | ASL Airlines Ireland | CONTRACT | Ireland | Former IATA Code: AG; former names: Hunting Air Cargo Airlines, Air Contractors |
| XJA | Assistance Aeroportuaire de L'Aeroport de Paris | France | |||
| AAE | Astec Air East | AIR EAST | United States | defunct | |
| 8V | ACP | Astral Aviation | ASTRAL CARGO | Kenya | |
| AAP | Astro Air International | ASTRO AIR | Philippines | defunct | |
| ATT | Attawasol Airlines | ATTAWASOL AIR | Libya | ||
| XM | XME | Australian airExpress | AUS-CARGO | Australia | |
| AO | AUZ | Australian Airlines | AUSTRALIAN | Australia | Subsidiary merged with Qantas |
| VAI | Avalair | AIR AVALAIR | Serbia | ||
| XP | VXP | Avelo Airlines | AVELO | United States | Former ICAO code: CXP; former names: Casino Express Airlines, Xtra Airways |
| VE | AVE | Avensa | AVENSA | Venezuela | defunct |
| VRT | Averitt Air Charter | AVERITT | United States | ||
| VSC | AVESCA | AVESCA | Colombia | defunct | |
| AJF | Avia Consult Flugbetriebs | AVIACONSULT | Austria | ||
| VTT | Avia Trans Air Transport | VIATRANSPORT | Sudan | ||
| 6A | CHP | Aviacsa | AVIACSA | Mexico | |
| AV | AVA | Avianca | AVIANCA | Colombia | |
| A0 | MCJ | Avianca Argentina | JETMAC | Argentina | Owned by Synergy Group |
| O6 | ONE | Avianca Brasil | OCEAN AIR | Brazil | Owned by Synergy Group |
| 2K | GLG | Avianca Ecuador | GALAPAGOS | Ecuador | Aerolíneas Galápagos SA |
| XAV | Aviaprom Enterprises | AVIAPROM | Russia | ||
| AVB | Aviation Beauport | BEAUPAIR | United Kingdom | ||
| AVQ | Aviation Services, Inc. | AQUILINE | United States | ||
| ACJ | Avicon | AVICHARTER | Kenya | ||
| VSR | Aviostart AS | AVIOSTART | Bulgaria | ||
| V5 | VLI | Avolar Aerolíneas | AEROVOLAR | Mexico | defunct |
| VSA | Avstar Aviation | STARBIRD | South Africa | ||
| AD | AZU | Azul Linhas Aéreas Brasileiras | Azul | Brazil | |
| BBF | B-Air Charter | SPEEDCHARTER | Germany | 2014 [10] | |
| CJ | CFE | BA CityFlyer | FLYER | United Kingdom | |
| TH | BRT | BA Connect | BRITISH | United Kingdom | defunct |
| EFW | BA Euroflyer | GRIFFIN | United Kingdom | BA Euroflyer subsidiary based at London Gatwick | |
| BAC | BAC Leasing Limited | United Kingdom | |||
| B4 | BCF | BACH Flugbetriebsges | BACH | Austria | |
| BOB | Backbone A/S | BACKBONE | Denmark | ||
| J4 | BDR | Badr Airlines | BADR AIR | Sudan | |
| BAE | BAE Systems | FELIX | United Kingdom | Corporate Air Travel | |
| UP | BHS | Bahamasair | BAHAMAS | Bahamas | |
| BAB | Bahrain Air BSC (Closed) | AWAL | Bahrain | ||
| BFW | Bahrain Defence Force | SUMMAN | Bahrain | ||
| BXA | Bahrain Executive Air Services | BEXAIR | Bahrain | ||
| BJA | Baja Air | BAJA AIR | Mexico | ||
| 8Q* | BAJ | Baker Aviation | RODEO | United States | |
| OGJ | Bakoji Airlines Services | BAKO AIR | Nigeria | ||
| V9 | BTC | BAL Bashkirian Airlines | BASHKIRIAN | Russia | |
| BEF | Balear Express | BALEAR EXPRESS | Spain | ||
| BLN | Bali International Air Service | BIAR | Indonesia | ||
| BAA | Balkan Agro Aviation | BALKAN AGRO | Bulgaria | ||
| LZ | LAZ | Balkan Bulgarian Airlines | BALKAN | Bulgaria | defunct |
| BHI | Balkh Airlines | SHARIF | Afghanistan | ||
| PNT | Balmoral Central Contracts | PORTNET | South Africa | ||
| BQ | BTL | Baltia Air Lines | BALTIA | United States | Callsign changed from "BALTIA FLIGHT" in 2015 [11] |
| BLL | Baltic Airlines | BALTIC AIRLINES | Russia | ||
| BLT | Baltic Aviation | BALTAIR | United States | ||
| BJC | Baltic Jet Aircompany | BALTIC JET | Latvia | ||
| BTH | Baltijas Helicopters | BALTIJAS HELICOPTERS | Latvia | ||
| CPJ | Baltimore Air Transport | CORPJET | United States | ||
| EAH | Baltimore Airways | EASTERN | United States | ||
| BTK | Baltyka | BALTYKA | Ukraine | ||
| QH | BAV | Bamboo Airways | BAMBOO | Vietnam | |
| QO | AJC | Bar Harbor Airlines | BAR HARBOR | United States | |
| BAX Global | |||||
| AUJ | Business Flight Salzburg | AUSTROJET | Austria | ||
| CWR | Beijing City International Jet | CITY WORLD | China | ||
| BJV | Beijing Vistajet Aviation | BEIJING VISTA | China | ||
| BHK | Blu Halkin | BLUEHAKIN | United Kingdom | ||
| BXJ | Brixtel Group | BRIXTEL JET | United States | ||
| BYG | Bygone Aviation | BYGONE | United States | ||
| BBJ | Blue Air Lines | BLUE KOREA | South Korea | ||
| BCJ | Blue Jet Charters | BLUE BOY | Poland | ||
| BNA | Bun Air Corporation | BUN AIR | United States | ||
| B3 | BTN | Bhutan Airlines | BHUTAN AIR | Bhutan | |
| BAF | Belgian Air Force | BELGIAN AIRFORCE | Belgium | ||
| BAK | Blackhawk Airways | BLACKHAWK | United States | ||
| L9 | BAL | Belle Air Europe | BELLEAIR EUROPE | Italy | Previously Britannia Airways |
| BAL | Britannia Airways | BRITANNIA | United Kingdom | Defunct | |
| BAM | Business Air Services | BUSINESS AIR | Canada | ||
| BAN | British Antarctic Survey | PENGUIN | United Kingdom | ||
| BAR | Bradly Air (Charter) Services | BRADLEY | Canada | ||
| BAU | Bissau Airlines | AIR BISSAU | Guinea-Bissau | ||
| BAV | Bay Aviation Ltd | BAY AIR | Bangladesh | ||
| BA | BAW | British Airways | SPEEDBIRD | United Kingdom | |
| BAX | Best Aero Handling Ltd | Russia | |||
| BAY | Bravo Airways | BRAVOAVIANCA | Ukraine | ||
| BBA | Bannert Air | BANAIR | Austria | ||
| BG | BBC | Biman Bangladesh Airlines | BANGLADESH | Bangladesh | |
| BO | BBD | Bluebird Nordic | BLUE CARGO | Iceland | |
| BBS | Beibars CJSC | BEIBARS | Kazakhstan | ||
| BBV | Bravo Airlines | BRAVO EUROPE | Spain | ||
| BO | BBW | BB Airways | BEEBEE AIRWAYS | Nepal | |
| BBZ | Bluebird Aviation | COBRA | Kenya | ||
| SI | BCI | Blue Islands | BLUE ISLAND | United Kingdom | |
| EO | BCL | British Caribbean Airways | United Kingdom | defunct | |
| BCR | British Charter | BACKER | United Kingdom | ||
| BCT | BCT Aviation | BOBCAT | United Kingdom | ||
| BCV | Business Aviation Center | BUSINESS AVIATION | Ukraine | ||
| WX | BCY | CityJet | CITY JET | Ireland | |
| BZ | BDA | Blue Dart Aviation | BLUE DART | India | |
| JA | BON | B&H Airlines | Air Bosna | Bosnia and Herzegovina | |
| BDF | Bissau Discovery Flying Club | BISSAU DISCOVERY | Guinea-Bissau | ||
| AYB | Belgian Army | BELGIAN ARMY | Belgium | ||
| BEA | Best Aviation Ltd | BEST AIR | Bangladesh | ||
| BED | Belgorod Air Enterprise | BELOGORYE | Russia | defunct | |
| BEH | Bel Air Helicopters | BLUECOPTER | Denmark | ||
| BEK | Berkut Air | BERKUT | Kazakhstan | ||
| BET | BETA - Brazilian Express Transportes Aéreos | BETA CARGO | Brazil | ||
| BFC | Basler Flight Service | BASLER | United States | ||
| BFG | Bear Flight | BEARFLIGHT | Sweden | ||
| J4 | BFL | Buffalo Airways | BUFFALO | Canada | |
| BFO | Bombardier | BOMBARDIER | Canada | ||
| BFR | Burkina Airlines | BURKLINES | Burkina Faso | ||
| BFS | Business Flight Sweden | BUSINESS FLIGHT | Sweden | ||
| 8H | BGH | BH Air | BALKAN HOLIDAYS | Bulgaria | |
| BGI | British Gulf International | BRITISH GULF | São Tomé and Príncipe | ||
| BGK | British Gulf International-Fez | GULF INTER | Kyrgyzstan | ||
| A8 | BGL | Benin Golf Air | BENIN GOLF | Benin | |
| BGM | Bugulma Air Enterprise | BUGAVIA | Russia | ||
| BGR | Budget Air Bangladesh | BUDGET AIR | Bangladesh | ||
| BGT | Bergen Air Transport | BERGEN AIR | Norway | ||
| U4 | BHA | Buddha Air | BUDDHA AIR | Nepal | |
| UH | BHL | Bristow Helicopters | BRISTOW | United Kingdom | |
| BHN | Bristow Helicopters Nigeria | BRISTOW HELICOPTERS | Nigeria | ||
| BHO | Bhoja Airlines | BHOJA | Pakistan | ||
| 4T | BHP | Belair Airlines | BELAIR | Switzerland | |
| BHR | Bighorn Airways | BIGHORN AIR | United States | ||
| BHT | Bright Air | BRIGHTAIR | Netherlands | ICAO code and call sign no longer allocated | |
| E6 | Bringer Air Cargo Taxi Aéreo | Brazil | |||
| BHY | Bosphorus European Airways | BOSPHORUS | Turkey | ||
| BID | Binair | BINAIR | Germany | ||
| BIG | Big Island Air | BIG ISLE | United States | ||
| BS | BIH | British International Helicopters | BRINTEL | United Kingdom | |
| BIL | Billund Air Center | BILAIR | Denmark | ||
| BIN | Boise Interagency Fire Center | BISON-AIR | United States | ||
| BIO | Bioflight A/S | BIOFLIGHT | Denmark | ||
| BIR | Bird Leasing | BIRD AIR | United States | ||
| BIZ | Bizjet Ltd | BIZZ | United Kingdom | ||
| BJS | Business Jet Solutions | SOLUTION | United States | ||
| B4 | BKA | Bankair | BANKAIR | United States | |
| BKF | BF-Lento OY | BAKERFLIGHT | Finland | ||
| BKK | Blink | BLINKAIR | United Kingdom | ||
| BKJ | Barken International | BARKEN JET | United States | ||
| PG | BKP | Bangkok Airways | BANGKOK AIR | Thailand | |
| BKV | Bukovyna | BUKOVYNA | Ukraine | ||
| BLB | Blue Bird Aviation | BLUEBIRD SUDAN | Sudan | ||
| BLC | Bellesavia | BELLESAVIA | Belarus | ||
| BLE | Blue Line | BLUE BERRY | France | ||
| KF | BLF | Blue1 | BLUEFIN | Finland | |
| BLG | Belgavia | BELGAVIA | Belgium | ||
| BLH | Blue Horizon Travel Club | BLUE HORIZON | United States | ||
| BLJ | Blue Jet | BLUEWAY | Spain | ||
| BLM | Blue Sky Airlines | BLUE ARMENIA | Armenia | defunct | |
| JV | BLS | Bearskin Lake Air Service | BEARSKIN | Canada | |
| B3 | BLV | Bellview Airlines | BELLVIEW AIRLINES | Nigeria | |
| BD | BMA | BMI | MIDLAND | United Kingdom | defunct |
| 2T | BMA | BermudAir | GOSLING | Bermuda | |
| BM | BMR | BMI Regional | MIDLAND | United Kingdom | |
| BMD | British Medical Charter | BRITISH MEDICAL | United Kingdom | ||
| BME | Briggs Marine Environmental Services | BRIGGS | United Kingdom | ||
| BMH | Bristow Masayu Helicopters | MASAYU | Indonesia | ||
| WW | BMI | Bmibaby | BABY | United Kingdom | defunct |
| CH | BMJ | Bemidji Airlines | BEMIDJI | United States | |
| 5Z | BML | Bismillah Airlines | BISMILLAH | Bangladesh | IATA code in use by another company |
| BMN | Bowman Aviation | BOWMAN | United States | ||
| BMW | BMW | BMW-FLIGHT | Germany | ||
| BMX | Banco de Mexico | BANXICO | Mexico | ||
| BND | Bond Offshore Helicopters | BOND | United Kingdom | ||
| BNE | Benina Air | BENINA AIR | Libya | ||
| BN | BNF | Braniff International Airways | Braniff | United States | defunct |
| BNG | BN Group Limited | VECTIS | United Kingdom | ||
| BNJ | Air Service Liège (ASL) | JET BELGIUM | Belgium | ||
| BNL | Blue Nile Ethiopia Trading | NILE TRADING | Ethiopia | ||
| BNR | Bonair Aviation | BONAIR | Canada | ||
| BNS | Bancstar - Valley National Corporation | BANCSTAR | United States | ||
| BNT | Bentiu Air Transport | BENTIU AIR | Sudan | ||
| BNV | Benane Aviation Corporation | BENANE | Mauritania | ||
| BNW | British North West Airlines | BRITISH NORTH | United Kingdom | ||
| BOD | Bond Air Services | UGABOND | Uganda | ||
| BOA | Boniair | KUMANOVO | North Macedonia | ||
| AB | BNZ | Bonza | BONZA | Australia | Defunct |
| BOE | Boeing | BOEING | United States | ||
| BOF | Bordaire | BORDAIR | Canada | ||
| BOO | Bookajet Limited | BOOKAJET | United Kingdom | ||
| BO | BOU | Bouraq Indonesia Airlines | BOURAQ | Indonesia | |
| BV | BPA | Blue Panorama Airlines | BLUE PANOROMA | Italy | |
| BPK | Berkhut ZK | VENERA | Kazakhstan | ||
| BPO | Bundespolizei-Fliegertruppe | PIROL | Germany | ||
| BPS | Budapest Aircraft Services/Manx2 | BASE | Hungary | ||
| BPT | Bonus Aviation | BONUS | United Kingdom | ||
| BPX | British Petroleum Exploration | Colombia | |||
| 7R | BRB | BRA-Transportes Aéreos | BRA-TRANSPAEREOS | Brazil | |
| BRD | Brock Air Services | BROCK AIR | Canada | ||
| BRE | Breeze Ltd | AVIABREEZE | Ukraine | ||
| 8E | BRG | Bering Air | BERING AIR | United States | |
| BRK | Briansk State Air Enterprise | BRIANSK-AVIA | Russia | ||
| BRN | Branson Airlines | BRANSON | United States | ||
| BRO | BASE Regional Airlines | COASTRIDER | Netherlands | ICAO code in use by another company, call sign no longer allocated | |
| BRS | Brazilian Air Force | BRAZILIAN AIR FORCE | Brazil | ||
| TH | BRT | British Regional Airlines | BRITISH | United Kingdom | defunct |
| B2 | BRU | Belavia Belarusian Airlines | BELARUS AVIA | Belarus | |
| BRV | Bravo Air Congo | BRAVO | Democratic Republic of the Congo | defunct | |
| BRW | Bright Aviation Services | BRIGHT SERVICES | Bulgaria | ||
| BRX | Buffalo Express Airlines | BUFF EXPRESS | United States | ||
| BRY | Burundayavia | BURAIR | Kazakhstan | ||
| BSC | Bistair - Fez | BIG SHOT | Kyrgyzstan | ||
| BSD | Blue Star Airlines | AIRLINES STAR | Mexico | ||
| BSI | Brasair Transportes Aéreos | BRASAIR | Brazil | ||
| BSJ | Blue Swan Aviation | BLUE SWAN | United Kingdom | ICAO Code and callsign (BSJ/BLUE SWAN) withdrawn | |
| BSM | Blue Sky Aviation | Lebanon | |||
| BSS | Bissau Aero Transporte | BISSAU AIRSYSTEM | Guinea-Bissau | ||
| BST | Best Air | TUNCA | Turkey | ||
| BSW | Blue Sky Airways | SKY BLUE | Czech Republic | ||
| GQ | BSY | Big Sky Airlines | BIG SKY | United States | |
| BTI | Air Baltic | Air Baltic | Latvia | ||
| ID | BTK | Batik Air | BATIK | Indonesia | |
| 4B | BTQ | Boutique Air | BOUTIQUE | United States | |
| BTR | Botir-Avia | BOTIR-AVIA | Kyrgyzstan | ||
| BTT | BT-Slavuta | BEETEE-SLAVUTA | Ukraine | ||
| Y6 | BTV | Batavia Air | BATAVIA | Indonesia | As of June 1, 2010, IATA code changed to Y6. |
| L9 | BTZ | Bristow U.S. LLC | BRISTOW | United States | |
| 1T | BUC | Bulgarian Air Charter | BULGARIAN CHARTER | Bulgaria | |
| BUL | Blue Airlines | BLUE AIRLINES | Democratic Republic of the Congo | ||
| BU | BUN | Buryat Airlines Aircompany | BURAL | Russia | |
| BUZ | Buzz Stansted | BUZZ | United Kingdom | ||
| BVA | Buffalo Airways | BUFFALO AIR | United States | ||
| BVC | Bulgarian Aeronautical Centre | BULGARIAN WINGS | Bulgaria | ||
| BVN | Baron Aviation Services | SHOW-ME | United States | ||
| J8 | BVT | Berjaya Air | BERJAYA | Malaysia | |
| B3 | BVU | Bellview Airlines, Sierra Leone | BELLVIEW AIRLINES | Sierra Leone | |
| BWD | Bluewest Helicopters-Greenland | BLUEWEST | Denmark | ||
| QW | BWG | Blue Wings | BLUE WINGS | Germany | defunct |
| BWI | Blue Wing Airlines | BLUE TAIL | Suriname | ||
| BWL | British World Airlines | BRITWORLD | United Kingdom | ||
| BXH | Bar XH Air | PALLISER | Canada | ||
| SN | BXI | Brussels Airlines | XENIA | Belgium | defunct as Brussels International Airlines in 2001 |
| BYA | Berry Aviation | BERRY | United States | ||
| BYC | Cambodia Bayon Airlines | Bayon Air | Cambodia | ||
| BYF | San Carlos Flight Center | BAY FLIGHT | United States | ||
| BYL | Bylina Joint-Stock Company | BYLINA | Russia | ||
| BYR | Berytos Airlines | Lebanon | |||
| BYE | Bayu Indonesia Air | BAYU | Indonesia | ||
| BZA | Bizair Fluggesellschaft | BERLIN BEAR | Germany | ||
| DB | BZH | Brit Air | BRITAIR | France | |
| BZZ | Butane Buzzard Aviation Corporation | BUZZARD | United Kingdom | ||
| JD | CBJ | Beijing Capital Airlines | CAPITAL JET | China | |
| CKM | BKS Air (Rivaflecha) | COSMOS | Spain | ||
| CLF | Bristol Flying Centre | CLIFTON | United Kingdom | ||
| CLN | Barnes Olsen Aeroleasing | SEELINE | United Kingdom | ||
| E9 | CXS | Boston-Maine Airways | CLIPPER CONNECTION | United States | Pan Am Clipper Connection Pan Am III |
| SN | BEL | Brussels Airlines | BEE-LINE | Belgium | |
| EBA | Bond Aviation | BOND AVIATION | Italy | ||
| EXB | Brazilian Army Aviation | BRAZILIAN ARMY | Brazil | ||
| EXP | Business Express Delivery | EXPRESS AIR | Canada | ||
| FOS | Bel Limited | Russia | |||
| GAA | Business Express | BIZEX | United States | ||
| HAW | Bangkok Aviation Center | THAI HAWK | Thailand | ||
| HAX | Benair | SCOOP | Norway | ||
| NT | IBB | Binter Canarias | BINTER | Spain | |
| IRJ | Bonyad Airlines | BONYAD AIR | Iran | ||
| IVR | Burundaiavia | RERUN | Kazakhstan | ||
| 0B | BLA | Blue Air | BLUE AIR | Romania | |
| KJ | LAJ | British Mediterranean Airways | BEE MED | United Kingdom | defunct |
| LBY | Belle Air | ALBAN-BELLE | Albania | ||
| LED | Blom Geomatics | SWEEPER | Norway | ||
| LTL | Benin Littoral Airways | LITTORAL | Benin | ||
| LXJ | Bombardier Business Jet Solutions | FLEXJET | United States | ||
| FB | LZB | Bulgaria Air | FLYING BULGARIA | Bulgaria | |
| MBR | Brazilian Navy Aviation | BRAZILIAN NAVY | Brazil | ||
| 8N | NKF | Barents AirLink | NORDFLIGHT | Sweden | previously Nordkalottflyg |
| NYB | Belgian Navy | BELGIAN NAVY | Belgium | ||
| OTA | Business Aviators | OUTLAW | United States | 2014 [10] | |
| OUF | Beijing Eofa International Jet | ELEMENT | China | 2014 [10] | |
| PEB | Benders Air | PALEMA | Sweden | ||
| POI | BGB Air | BOJBAN | Kazakhstan | ||
| PPS | Butte Aviation | PIPESTONE | United States | ||
| PVO | Bearing Supplies Limited | PROVOST | United Kingdom | ||
| RHD | Bond Air Services | RED HEAD | United Kingdom | ||
| RLR | Business Airfreight | RATTLER | United States | ||
| RRS | Boscombe Down DERA (Formation) | BLACKBOX | United Kingdom | ||
| SCJ | Business Jet Sweden | SCANJET | Sweden | ||
| SHT | British Airways Shuttle | SHUTTLE | United Kingdom | BA domestic services | |
| SKH | British Sky Broadcasting | SKYNEWS | United Kingdom | ||
| TBL | Bell Aliant Regional Communications | TELCO | Canada | ||
| TXB | Bell Helicopter Textron | TEXTRON | Canada | ||
| UKA | Buzzaway Limited | UKAY | United Kingdom | ||
| VLX | Biz Jet Charter | AVOLAR | United States | ||
| VOL | Blue Chip Jet | BLUE SPEED | Sweden | ||
| WFD | BAE Systems | AVRO | United Kingdom | Woodford Flight Test | |
| WTN | BAE Systems | TARNISH | United Kingdom | Warton Military Flight Ops | |
| XBO | Baseops International | United States | |||
| XDA | Bureau Veritas | France | |||
| XMS | British Airways Santa | SANTA | United Kingdom | Christmas charter flights | |
| ZBA | Boskovic Air Charters Limited | BOSKY | Kenya | ||
| JMP | Businesswings | JUMP RUN | Germany | ||
| OB | BOV | Boliviana de Aviación | BOLIVIANA | Bolivia | |
| YB | BRJ | Borajet | BORA JET | Turkey | |
| MX | MXY | Breeze Airways | MOXY | United States | |
| VL | LHX | City Airlines | CITYAIR | Germany | LH subsidiary Allocated in 2023 [12] |
| SRJ | C Air Jet Airlines | SYRJET | Syria | ||
| TIP | C and M Aviation | TRANSPAC | United States | ||
| ORO | C N Air | CAPRI | Spain | ||
| RWG | C&M Airways | RED WING | United States | ||
| RMU | C.S.P., Societe | AIR-MAUR | Mauritania | ||
| CJZ | Caliber Jet | CALIBER JET | United States | ||
| 4A | DYN | California Pacific Airlines | AERODYNAMICS | United States | defunct |
| QC | CRC | Camair-Co | CAMAIRCO | Cameroon | |
| QAI | Conquest Air | CHICKPEA | United States | 2014 [13] | |
| CBH | Corporate Eagle Management Services | CLUB HOUSE | United States | Allocated in 2014 [14] | |
| CRF | Croix Rouge Francais | CROIX ROUGE | France | 2014 [13] | |
| CAA | Civil Aviation Authority of the Czech Republic | INSPECTOR | Czech Republic | ||
| BKR | Civil Air Patrol South Carolina Wing | BOX KAR | United States | ||
| BFN | Compagnie Nationale Naganagani | Burkino Faso | |||
| AWX | Civil Aviation Authority Directorate of Airspace Policy | ALLWEATHER | United Kingdom | ||
| BBN | Civil Aviation Authority Airworthiness Division | BRABAZON | United Kingdom | ||
| ATQ | CHC Helicopters Nigeria | COLIBRI | Nigeria | ||
| APL | Corporativo Aereo Principal | AEREO PRINCIPAL | Mexico | ||
| AIO | Chief of Staff, United States Air Force | AIR CHIEF | United States | ||
| AID | Christian Konig - Century Airbirds | CENTURY AIRBIRD | Austria | ||
| Cambridge Recurrent Training | CAMBRIDGE | United Kingdom | |||
| California Department of Forestry and Fire Protection | CALFIRE | United States | |||
| Careflight Queensland | SAMARITAN | Australia | |||
| Castle Air Charter | CASTLEFILM | United Kingdom | |||
| Challenges Aviation | TIGER | United Kingdom | |||
| Challenges Limited | HERITAGE | United Kingdom | |||
| Cheqair | ASTON | United Kingdom | |||
| Clacton Aero Club | CLASSIC WINGS | United Kingdom | |||
| Coral Sun Airways | CORAL SUN | Kiribati | |||
| Cowan Group | COWAN | United States | |||
| SMW | Carpatair Flight Service | SMART WINGS | Romania | Was Carpatair Flight Training | |
| CCL | Cambodia Airlines | ANGKOR WAT | Cambodia | ||
| KR | KME | Cambodia Airways | GIANT IBIS | Cambodia | |
| CCB | Caricom Airways | DOLPHIN | Barbados | ||
| CYH | China Southern Airlines Henan | YUHAO | China | ||
| CFB | Chongqing Forebase General Aviation | FOREBASE | China | ||
| XCA | Colt Transportes Aereos | COLT | Brazil | ||
| GCY | CHC Global Operations International | HELIBIRD | United Kingdom | ||
| AUN | Common Sky | COMMON SKY | Austria | ||
| CBI | Cabi | CABI | Ukraine | ||
| CPI | Compagnia Aeronautica Italiana | AIRCAI | Italy | ||
| 5C | ICL | Challenge Airlines IL | CAL | Israel | ex CAL-Cargo Air Lines |
| CMR | CAM Air Management | CAMEO | United Kingdom | ||
| CTZ | CATA Línea Aérea | CATA | Argentina | ||
| CCF | CCF Manager Airline | TOMCAT | Germany | ||
| CED | CEDTA (Compañía Ecuatoriana De Transportes Aéreos) | CEDTA | Ecuador | ||
| HBI | CHC Denmark | HELIBIRD | Denmark | ||
| HEM | CHC Helicopter | HEMS | Australia | ||
| AW | SCH | CHC Airways | SCHREINER | Netherlands | formerly Schreiner Airways. ICAO code in use by another company, call sign no longer allocated |
| HKS | CHC Helikopter Service | HELIBUS | Norway | ||
| VCI | CI-Tours | CI-TOURS | Ivory Coast | ||
| CKC | CKC Services | United States | |||
| CMZ | CM Stair | CEE-EM STAIRS | Mauritania | ||
| CNT | Centre national d'études des télécommunications - C.N.E.T. | KNET | France | ||
| OAP | COAPA AIR | COAPA | Mexico | ||
| PDR | COMAV | SPEEDSTER | Namibia | ||
| CRH | CRI Helicopters Mexico | HELI-MEX | Mexico | ||
| IRO | CSA Air | IRON AIR | United States | ||
| CSE | CSE Aviation | OXFORD | United Kingdom | ||
| CTQ | CTK Network Aviation | CITYLINK | Ghana | ||
| CBR | Cabair College of Air Training | CABAIR | United Kingdom | ||
| CVE | Cabo Verde Express | KABEX | Cape Verde | ||
| CWD | Caernarfon Airworld | AMBASSADOR | United Kingdom | ||
| CXE | Caicos Express Airways | CAICOS | Turks and Caicos Islands | ||
| CCE | Cairo Air Transport Company | Egypt | |||
| CGC | Cal Gulf Aviation | CAL-GULF | São Tomé and Príncipe | ||
| REZ | Cal-West Aviation | CAL AIR | United States | ||
| CSL | California Air Shuttle | CALIFORNIA SHUTTLE | United States | ||
| 3C | CMV | Calima Aviación | CALIMA | Spain | |
| MO | CAV | Calm Air | CALM AIR | Canada | |
| R9 | CAM | Camai Air | AIR CAMAI | United States | Village Aviation |
| K6 | KHV | Cambodia Angkor Air | ANGKOR AIR | Cambodia | |
| UY | UYC | Cameroon Airlines | CAM-AIR | Cameroon | defunct |
| HSO | Campania Helicopteros De Transporte | HELIASTURIAS | Spain | ||
| C6 | CJA | CanJet | CANJET | Canada | |
| PIL | Canada Jet Charters | PINNACLE | Canada | ||
| CP | CDN | Canadian Airlines | CANADIAN | Canada | defunct |
| CTG | Canadian Coast Guard | CANADIAN COAST GUARD | Canada | ||
| HIA | Canadian Eagle Aviation | HAIDA | Canada | ||
| CFC | Canadian Forces | CANFORCE | Canada | ||
| BZD | Canadian Global Air Ambulance | BLIZZARD | Canada | ICAO Code and callsign no longer allocated | |
| CDN | Canadian Helicopters | CANADIAN | Canada | ||
| TKR | Canadian Interagency Forest Fire Centre | TANKER | Canada | ICAO Code and callsign no longer allocated | |
| XNC | Canadian National Telecommunications | Canada | ICAO Code and callsign no longer allocated | ||
| 7F | AKT | Canadian North | ARCTIC | Canada | Air Norterra |
| CP | CPC | Canadian Pacific Airlines | EMPRESS | Canada | ICAO Code and callsign no longer allocated |
| CDR | Canadian Regional Airlines | CANADIAN REGIONAL | Canada | ICAO Code and callsign no longer allocated | |
| CWH | Canadian Warplane Heritage Museum | WARPLANE HERITAGE | Canada | ||
| W2 | CWA | Canadian Western Airlines | CANADIAN WESTERN | Canada | |
| CWW | Canair | CANAIR | China | ||
| CUI | Cancun Air | CAN-AIR | Mexico | ||
| 9K | KAP | Cape Air | CAIR | United States | |
| CTO | Cape Air Transport | Australia | |||
| SEM | Cape Central Airways | SEMO | United States | ||
| CMY | Cape Smythe Air | CAPE SMYTHE AIR | United States | ||
| CPX | Capital Air Service | CAPAIR | United States | ||
| CPD | Capital Airlines | CAPITAL DELTA | Kenya | ||
| NCP | Capital Airlines Limited | CAPITAL SHUTTLE | Nigeria | ||
| PT | CCI | Capital Cargo International Airlines | CAPPY | United States | Allocation deleted 2013 |
| CCQ | Capital City Air Carriers | CAP CITY | United States | ||
| EGL | Capital Trading Aviation | PRESTIGE | United Kingdom | ||
| CEX | Capitol Air Express | CAPITOL EXPRESS | United States | ||
| CWZ | Capitol Wings Airline | CAPWINGS | United States | ||
| VAN | Caravan Air | CAMEL | Mauritania | ||
| CWN | Cardiff Wales Flying Club | CAMBRIAN | United Kingdom | ||
| FVA | Cardinal/Air Virginia | AIR VIRGINIA | United States | ||
| GOL | Cardolaar | CARGOLAAR | Namibia | ||
| CDI | Cards Air Services | CARDS | Philippines | ||
| CFH | CareFlight | CARE FLIGHT | Australia | ||
| CDM | Carga Aérea Dominicana | CARGA AEREA | Dominican Republic | ||
| EST | Carga Express Internacional | CARGAINTER | Mexico | ||
| GG | GGC | Cargo 360 | LONG-HAUL | United States | |
| MCX | Cargo Express | MAURICARGO | Mauritania | ||
| CRV | Cargo Ivoire | CARGOIV | Ivory Coast | ||
| CLM | Cargo Link (Caribbean) | CARGO LINK | Barbados | ||
| P3 | CLU | Cargo Logic Air | FIREBIRD | United Kingdom | |
| CTW | Cargo Three | THIRD CARGO | Panama | ||
| 2G | CRG | Cargoitalia | WHITE PELICAN | Italy | |
| W8 | CJT | Cargojet Airways | CARGOJET | Canada | |
| CV | CLX | Cargolux | CARGOLUX | Luxembourg | |
| C8 | ICV | Cargolux Italia | CARGO MED | Italy | |
| CGM | Cargoman | HOTEL CHARLIE | Oman | ||
| DEL | Carib Aviation | RED TAIL | Antigua and Barbuda | ||
| BCB | Carib Express | WAVEBIRD | Barbados | ||
| PWD | CARIBAIR | CARIBAIR | Dominican Republic | ||
| DCC | Caribbean Air Cargo | CARICARGO | Barbados | ||
| CLT | Caribbean Air Transport | CARIBBEAN | Netherlands | ICAO Code and callsign no longer allocated | |
| CLT | Club Aerocelta de Vuelo Con Motor | Spain | |||
| BW | BWA | Caribbean Airlines | CARIBBEAN AIRLINES | Trinidad and Tobago | |
| IQQ | Caribbean Airways | CARIBJET | Barbados | ||
| CSX | Choice Airways | CHOICE AIR | United States | ||
| TLC | Caribbean Express | CARIB-X | United States | ||
| 8B | GFI | Caribbean Star Airlines | CARIB STAR | Antigua and Barbuda | |
| CRB | Caricom Airways | CARIBBEAN COMMUTER | Suriname | ||
| CRT | Caribintair | CARIBINTAIR | Haiti | ||
| CVG | Carill Aviation | CARILL | United Kingdom | ||
| V3 | KRP | Carpatair | CARPATAIR | Romania | |
| CRR | Carranza | CARRANZA | Chile | defunct | |
| ULS | Carroll Air Service | ULSTER | United States | ||
| CMT | Casement Aviation | CASEMENT | United States | ||
| CSO | Casino Airline | CASAIR | United States | ||
| CSP | Casper Air Service | CASPER AIR | United States | ||
| RV | CPN | Caspian Airlines | CASPIAN | Iran | |
| CSJ | Castle Aviation | CASTLE | United States | ||
| CAZ | Cat Aviation | EUROCAT | Switzerland | ||
| CBT | Catalina Flying Boats | CATALINA AIR | United States | ||
| TEX | Catex | CATEX | France | ||
| KA | HDA | Cathay Dragon | DRAGON | Hong Kong | defunct IATA Code transferred to Aero Nomad Airlines |
| CX | CPA | Cathay Pacific | CATHAY | Hong Kong | |
| CJR | Caverton Helicopters | CAVERTON AIR | Nigeria | ||
| KX | CAY | Cayman Airways | CAYMAN | Cayman Islands | |
| 5J | CEB | Cebu Pacific | CEBU | Philippines | |
| CIL | Cecil Aviation | CECIL | United Kingdom | ||
| CEG | Cega Aviation | CEGA | United Kingdom | ||
| CEC | Celtic Airways | CELTAIR | United Kingdom | ||
| CWE | Celtic West | CELTIC | United Kingdom | ||
| CEV | Centre d'Essais en Vol | CENTEV | France | ||
| CNL | Centennial Airlines | WYO-AIR | United States | ||
| CNS | Cobalt Air LLC | CHRONOS | United States | ||
| CVO | Center Vol | CENTERVOL | Spain | ||
| CTS | Center-South | CENTER-SOUTH | Russia | ||
| CET | Centrafrican Airlines | CENTRAFRICAIN | Central African Republic | ||
| CAX | Central Air Express | CENTRAL EXPRESS | Democratic Republic of the Congo | ||
| CTL | Central Airlines | CENTRAL COMMUTER | United States | ||
| CNY | Central Airways | CENTRAL LEONE | Sierra Leone | ||
| ACN | Central American Airlines | AEROCENTRO | Nicaragua | ||
| YOG | Central Aviation | YOGAN AIR | United States | ||
| DRN | Central De Discos De Reynosa | DISCOS REYNOSA | Mexico | ||
| 2C | CMA | CMA-CGM AIRCARGO | FRENCH CARGO | France | |
| CHA | Central Flying Service | CHARTER CENTRAL | United States | ||
| CEM | Central Mongolia Airways | CENTRAL MONGOLIA | Mongolia | ||
| 9M | GLR | Central Mountain Air | GLACIER | Canada | |
| CQC | Central Queensland Aviation College | Australia | |||
| CSI | Central Skyport | SKYPORT | United States | ||
| CLW | Centralwings | CENTRALWINGS | Poland | ||
| DTV | Centre Airlines | DUTCH VALLEY | United States | ||
| CGS | Centre of Applied Geodynamica | GEO CENTRE | Russia | ||
| J7 | CVC | Centre-Avia | AVIACENTRE | Russia | |
| CCV | Centro De Helicopteros Corporativos | HELICORPORATIVO | Mexico | ||
| ACF | Centro de Formación Aeronáutica de Canarias | FORCAN | Spain | ||
| WE | CWC | Centurion Air Cargo | CHALLENGE CARGO | United States | |
| URY | Century Aviation | CENTURY AVIA | Mexico | ||
| HAI | Century Aviation International | Canada | |||
| XAD | Certified Air Dispatch | United States | |||
| CER | Cetraca Aviation Service | CETRACA | Democratic Republic of the Congo | ||
| IRU | Chabahar Airlines | CHABAHAR | Iran | ||
| GM | GSW | Chair Airlines | EIGER | Switzerland | |
| CLG | Chalair Aviation | CHALLAIR | France | ||
| OP | CHK | Chalk's International Airlines | CHALKS | United States | |
| CLS | Challenge Air Transport | AIRISTO | Germany | ||
| CHS | Challenge Aviation | CHALLENGE AVIATION | Australia | ||
| OFF | Challenge International Airlines | CHALLENGE AIR | United States | ||
| CHG | Challenge Airlines BE | Challenge | Belgium | ||
| CPH | Champagne Airlines | CHAMPAGNE | France | ||
| MG | CCP | Champion Air | CHAMPION AIR | United States | |
| NCH | Chanchangi Airlines | CHANCHANGI | Nigeria | ||
| 2Z | CGN | Chang An Airlines | CHANGAN | China | |
| CHN | Channel Island Aviation | CHANNEL | United States | ||
| WML | Chantilly Air | MARLIN | United States | ||
| CPL | Chaparral Airlines | CHAPARRAL | United States | ||
| S8 | CSU | Chari Aviation Services | CHARI SERVICE | Chad | |
| CAH | Charlan Air Charter | CHARLAN | South Africa | ICAO Code and callsign no longer allocated | |
| HMD | Charlie Hammonds Flying Service | HAMMOND | United States | ||
| CGD | Charlotte Air National Guard | United States | |||
| CHW | Charter Air | CHARTER WIEN | Austria | ||
| HRT | Chartright Air | CHARTRIGHT | Canada | ||
| RP* | CHQ | Chautauqua Airlines | CHAUTAUQUA | United States | Was US* |
| CBB | Cheboksary Airenterprise JSC | CHEBAIR | Russia | ||
| CHM | Chemech Aviation | Pakistan | |||
| CHZ | Cherline | CHERL | Russia | ||
| CMK | Chernomor-Avia | CHERAVIA | Russia | ||
| CBM | Cherokee Express | BLUE MAX | United States | ||
| CCY | Cherry Air | CHERRY | United States | ||
| CAB | Chesapeake Air Service | CHESAPEAKE AIR | United States | ||
| CVR | Chevron U.S.A | CHEVRON | United States | ||
| CYA | Cheyenne Airways | CHEYENNE AIR | United States | ||
| CGO | Chicago Air | WILD ONION | United States | ||
| C8 | WDY | Chicago Jet Group | WINDY CITY | United States | |
| RAT | Chief Rat Flight Services | RIVERRAT | South Africa | defunct | |
| CCH | Chilchota Taxi Aéreo | CHILCHOTA | Mexico | ||
| DES | Chilcotin Caribou Aviation | CHILCOTIN | Canada | ||
| CAD | Chilliwack Aviation | CHILLIWACKAIR | Canada | ||
| ETN | Chim-Nir Aviation | CHIMNIR | Israel | ||
| CI | CAL | China Airlines | DYNASTY | Taiwan | |
| CK | CKK | China Cargo Airlines | CARGO KING | China | |
| MU | CES | China Eastern Airlines | CHINA EASTERN | China | |
| G5 | HXA | China Express Airlines | CHINA EXPRESS | China | |
| CFA | China Flying Dragon Aviation | FEILONG | China | ||
| CTH | China General Aviation Corporation | TONGHANG | China | ||
| CAG | China National Aviation Corporation | CHINA NATIONAL | China | ||
| CJ | CBF | China Northern Airlines | CHINA NORTHERN | China | defunct. |
| WH | CNW | China Northwest Airlines | CHINA NORTHWEST | China | defunct |
| CHC | China Ocean Helicopter Corporation | CHINA HELICOPTER | China | ||
| 8Y | CYZ | China Postal Airlines | CHINA POST | China | |
| CZ | CSN | China Southern Airlines | CHINA SOUTHERN | China | |
| CXN | China Southwest Airlines | CHINA SOUTHWEST | China | defunct | |
| KN | CUA | China United Airlines | LIANHANG | China | |
| XO | CXH | China Xinhua Airlines | XINHUA | China | |
| 3Q | CYH | China Yunnan Airlines | YUNNAN | China | defunct |
| CGU | Chinguetti Airlines | CHINGUETTI | Mauritania | ||
| CEP | Chipola Aviation | CHIPOLA | United States | ||
| CPW | Chippewa Air Commuter | CHIPPEWA-AIR | United States | ||
| X7 | CHF | Chitaavia | CHITA | Russia | |
| OQ | CQN | Chongqing Airlines | CHONG QING | China | |
| CAS | Christman Air System | CHRISTMAN | United States | ||
| OEC | Christophorus Flugrettungsverein | CHRISTOPHORUS | Austria | ||
| CHO | Chrome Air Services | CHROME AIR | United States | ||
| CHU | Church Aircraft | CHURCHAIR | United States | ||
| A2 | CIU | Cielos Airlines | CIELOS | Peru | |
| QI | CIM | Cimber Sterling | CIMBER | Denmark | |
| C7 | CIN | Cinnamon Air | CINNAMON | Sri Lanka | |
| RRU | Cirrus | HELICIRRUS | Chile | defunct | |
| NTS | Cirrus Air | NITE STAR | United States | ||
| C9 | RUS | Cirrus Airlines | CIRRUS AIR | Germany | defunct |
| JTI | Cirrus Middle East | Lebanon | |||
| FIV | CitationAir | FIVE STAR | United States | ||
| XCX | Citibank | United States | |||
| HZX | Citic General Aviation | ZHONGXIN | China | ||
| SDR | City Airline | SWEDESTAR | Sweden | ||
| G3 | CIX | City Connexion Airlines | CONNEXION | Burundi | defunct |
| XBG | City of Bangor | United States | |||
| WX | BCY | CityJet | CITY-IRELAND | Ireland | |
| CAQ | Cityair (Chester) Limited | AIR CHESTER | United Kingdom | ||
| CII | Cityfly | CITYFLY | Italy | ||
| CJ | CFE | CityFlyer Express | FLYER | United Kingdom | Defunct, ICAO code in use by BA CityFlyer |
| CNB | Cityline Hungary | CITYHUN | Hungary | ||
| HSR | Citylink Airlines | HOOSIER | United States | ||
| CIW | Civair Airways | CIVFLIGHT | South Africa | ||
| CAP | Civil Air Patrol | CAP | United States | ||
| CT | CAT | Civil Air Transport | Mandarin | Taiwan | defunct |
| CIA | Civil Aviation Authority | CALIMERA | Slovakia | ||
| CIV | Civil Aviation Authority of New Zealand | CIVAIR | New Zealand | ||
| CBA | Civil Aviation Inspectorate of the Czech Republic | CALIBRA | Czech Republic | ||
| FMC | Claessens International Limited | CLAESSENS | United Kingdom | ||
| CLK | Clark Aviation | CLARKAIR | United States | ||
| CSF | Clasair | CALEDONIAN | United Kingdom | ||
| CLY | Clay Lacy Aviation | CLAY-LACY | United States | ||
| CGK | Click Airways | CLICK AIR | Kyrgyzstan | ||
| CLZ | Cloud 9 Air Charters | CLOUDLINE | South Africa | ||
| CLD | Clowes Estates Limited | CLOWES | United Kingdom | ||
| SDJ | Club 328 | SPACEJET | United Kingdom | ||
| 6P | ISG | Club Air | CLUBAIR | Italy | |
| BX | CST | Coast Air | COAST CENTER | Norway | |
| DQ | Coastal Air | U.S. Virgin Islands | United States | ||
| TCL | Coastal Air Transport | TRANS COASTAL | United States | Escape Aviation | |
| CNG | Coastal Airways | SID-AIR | United States | ||
| CSV | Coastal Travels | COASTAL TRAVEL | Tanzania | ||
| CHL | Cohlmia Aviation | COHLMIA | United States | ||
| OLR | Colaéreos | COLAEREOS | Ecuador | ||
| CLE | Colemill Enterprises | COLEMILL | United States | ||
| 9L | CJC | Colgan Air | COLGAN | United States | |
| CAE | Colibri Aviation | HUMMINGBIRD | Canada | ||
| YD | CAT | Cologne Air Transport GmbH | Germany | defunct since 1996 | |
| CCX | Colt International | United States | |||
| WCO | Columbia Helicopters | COLUMBIA HELI | United States | ||
| KLR | Columbus Air Transport | KAY-LER | United States | ||
| GHP | Colvin Aviation | GRASSHOPPER EX | United States | ||
| OH | COM | Comair | COMAIR | United States | |
| MN | CAW | Comair | COMMERCIAL | South Africa | |
| GCM | Comair Flight Services | GLOBECOM | South Africa | ||
| CDE | Comed Group | COMEX | United Kingdom | ||
| CVV | Comeravia | COMERAVIA | Venezuela | ||
| CRS | Comercial Aérea | COMERCIAL AEREA | Mexico | ||
| CMG | Comet Airlines | SUNSPY | Nigeria | ||
| FYN | Comfort Air | FLYNN | Germany | ||
| CMJ | Comfort Jet Services | COMFORT JET | Togo | ||
| CLA | Comlux Aviation | COMLUX | Switzerland | ||
| KAZ | Comlux Kazakhstan | KAZLUX | Kazakhstan | ||
| MLM | Comlux Malta | LUXMALTA | Malta | ||
| CXB | Comlux Aruba | STARLUX | Aruba | ||
| CMH | Commair Aviation | COMMODORE | United Kingdom | ||
| CTM | Commandement Du Transport Aerien Militaire Francais | COTAM | France | ||
| CML | Commander Air Charter | COMMANDAIR | Canada | ||
| CRM | Commander Mexicana | COMMANDERMEX | Mexico | [13] | |
| CME | Commerce Bank | COMMERCE BANK | United States | (Kansas City) Allocated in 2014 [15] | |
| CMS | Commercial Aviation | ACCESS | Canada | ||
| GAR | Commodore Aviation | Australia | |||
| CJS | Commonwealth Jet Service | COMMONWEALTH | United States | ||
| C5 | UCA | CommutAir | COMMUTAIR | United States | |
| KR | CWK | Comores Airlines | CONTICOM | Comoros | |
| CGR | Compagnia Generale Ripreseaeree | COMPRIP | Italy | ||
| CMM | Compagnie Aérienne du Mali | CAMALI | Mali | ||
| CPM | Compagnie Mauritanienne Des Transports | Mauritania | |||
| GIC | Compagnie de Bauxites de Guinee | CEBEGE | Guinea | ||
| AIF | Compañía Aérea de Valencia | Spain | |||
| ATF | Compañía Aerotécnicas Fotográficas | AEROTECNICAS | Spain | ||
| LCT | Compañía De Actividades Y Servicios De Aviación | STELLAIR | Spain | ||
| EJV | Compania Ejecutiva | EJECUTIVA | Mexico | ||
| HSE | Compania Helicopteros Del Sureste | HELISURESTE | Spain | ||
| MDR | Compania Mexicana De Aeroplanos | AEROPLANOS | Mexico | ||
| HSS | Compañía Transportes Aéreos Del Sur | TAS HELICOPTEROS | Spain | ||
| TAV | Compañía de Servicios Aéreos Tavisa | TAVISA | Spain | ||
| CYF | Company Flight | COMPANY FLIGHT | Denmark | ||
| CP | CPZ | Compass Airlines | COMPASS ROSE | United States | |
| CPS | Compass International Airways | COMPASS | United Kingdom | ||
| XCO | Compuflight Operations Service | United States | |||
| XCS | Compuserve Incorporated | United States | |||
| CRC | Conair Aviation | CONAIR-CANADA | Canada | ||
| COD | Concordavia | CONCORDAVIA | Ukraine | ||
| CNR | Condor Aero Services | CONAERO | United States | ||
| CIB | Condor | CONDOR BERLIN | Germany | ||
| DE | CFG | Condor Flugdienst | CONDOR | Germany | |
| COF | Confort Air | CONFORT | Canada | ||
| CAK | Congo Air | Bahamas | |||
| CGA | Congressional Air | CONGRESSIONAL | United States | ||
| ROY | Conifair Aviation | Canada | |||
| CCT | Connect Air | CONNECT | Canada | Allocated in 2014 [16] | |
| BSN | Connectair Charters | BASTION | Canada | ||
| CAC | Conquest Airlines | CONQUEST AIR | United States | ||
| CXO | Conroe Aviation Services | CONROE AIR | United States | ||
| VCH | Consorcio Helitec | CONSORCIO HELITEC | Venezuela | ||
| UZA | Constanta Airline | CONSTANTA | Ukraine | ||
| KIS | Contactair | CONTACTAIR | Germany | ||
| XCL | Contel ASC | United States | |||
| CO | COA | Continental Airlines | CONTINENTAL | United States | ICAO Code and callsign withdrawn, merged with United Airlines |
| CNW | Continental Airways | Moldovoa | 2014 [13] | ||
| CO | Continental Express | JETLINK | United States | ||
| CS | CMI | Continental Micronesia | AIR MIKE | United States | |
| CON | Continental Oil | CONOCO | United States | ||
| CS | CS | Cambrian Airways | Cambrian | United Kingdom | defunct 1974 |
| V0 | VCV | Conviasa | CONVIASA | Venezuela | |
| CKA | Cook Inlet Aviation | COOK-AIR | United States | ||
| SVY | Cooper Aerial Surveys | SURVEYOR | United Kingdom | ||
| CM | CMP | Copa Airlines | COPA | Panama | |
| CAT | Copenhagen Air Taxi | AIRCAT | Denmark | ||
| COP | Copper State Air Service | COPPER STATE | United States | ||
| AAQ | Copterline | COPTERLINE | Finland | Former name: Copter Action; former callsign: COPTER ACTION | |
| CQ | CCW | Central Charter | CENTRAL CHARTER | Czech Republic | |
| XC | CAI | Corendon Airlines | CORENDON | Turkey | Turistik Hava Tasimacilik |
| CD | CND | Corendon Dutch Airlines | DUTCH CORENDON | Netherlands | |
| CRA | Coronado Aerolíneas | CORAL | Colombia | ||
| CPB | Corpac Canada | PENTA | Canada | ||
| CNC | Corporación Aéreo Cencor | CENCOR | Mexico | ||
| CPG | Corporacion Aeroangeles | CORPORANG | Mexico | ||
| CGY | Corporacion Paraguaya De Aeronautica | Paraguay | |||
| CPT | Corporate Air | AIR SPUR | United States | ||
| CPR | Corporate Air | CORPAIR | United States | ||
| CPO | Corporate Aircraft Company | MOKAN | United States | ||
| COO | Corporate Airlink | CORPORATE | Canada | ||
| CKE | Corporate Aviation Services | CHECKMATE | United States | ||
| VHT | Corporate Flight International | VEGAS HEAT | United States | ||
| LF | VTE | Contour Airlines | VOLUNTEER | United States | |
| CJI | Corporate Jets | SEA JET | United States | ||
| SS | CRL | Corsairfly | CORSAIR | France | |
| XK | CCM | Corse Méditerranée | CORSICA | France | Name changed to Air Corsica |
| F5 | COZ | Cosmic Air | COSMIC AIR | Nepal | |
| COT | Costa Airlines | COAIR | Venezuela | defunct | |
| GW | CRG | Costa Rica Green Airways | Costa Rica | ||
| CHI | Cougar Helicopters | COUGAR | Canada | ||
| MGB | Coulson Flying Service | MOCKINGBIRD | United Kingdom | ||
| NSW | Country Connection Airlines | Australia | |||
| CIK | Country International Airlines | COUNTRY AIR | Kyrgyzstan | Defunct | |
| CSD | Courier Services | DELIVERY | United States | ||
| CUT | Court Helicopters | COURT AIR | South Africa | ||
| OU | Court Line | COURTLINE | United Kingdom | defunct | |
| CVL | Coval Air | COVAL | Canada | ||
| COW | COWI | COWI | Denmark | ||
| 7C | COY | Coyne Aviation | COYNE AIR | United Kingdom | |
| CFD | Cranfield University | AERONAUT | United Kingdom | ||
| CRE | Cree Airways | CREE AIR | Canada | ||
| ELM | Crelam | CRELAM | Mexico | ||
| CAN | Crest Aviation | CREST | United Kingdom | ||
| KRM | Crimea Universal Avia | TRANS UNIVERSAL | Ukraine | ||
| OU | CTN | Croatia Airlines | CROATIA | Croatia | |
| HRZ | Croatian Air Force | CROATIAN AIRFORCE | Croatia | ||
| CRX | Cross Aviation | CROSSAIR | United Kingdom | ||
| QE | ECC | Crossair Europe | Cigogne | Switzerland | |
| CWX | Crow Executive Air | CROW EXPRESS | United States | ||
| CKR | Crown Air Systems | CROWN AIR | United States | ||
| CRO | Crown Airways | CROWN AIRWAYS | United States | ||
| CRW | Crownair | REGAL | Canada | ||
| VCR | Cruiser Linhas Aéreas | VOE CRUISER | Brazil | ||
| CTY | Cryderman Air Service | CENTURY | United States | ||
| CYT | Crystal Shamrock Airlines | CRYSTAL-AIR | United States | ||
| IRO | CSA Air | IRON AIR | United States | ||
| CU | CUB | Cubana de Aviación | CUBANA | Cuba | |
| CTF | Cutter Aviation | CUTTER FLIGHT | United States | ||
| CBL | Cumberland Airways (Nicholson Air Service) | CUMBERLAND | United States | ||
| CTT | Custom Air Transport | CATT | United States | ||
| RGN | Cygnus Air | CYGNUS AIR | Spain | ||
| CYC | Cyprair Tours | CYPRAIR | Cyprus | ||
| CYS | Cypress Airlines | SKYBIRD | Canada | ||
| CY | CYP | Cyprus Airways | CYPRUS | Cyprus | |
| YK | KYV | Cyprus Turkish Airlines | AIRKIBRIS | Turkey | Ceased operations 2010 |
| CEF | Czech Air Force | CZECH AIR FORCE | Czech Republic | ||
| AHD | Czech Air Handling | AIRHANDLING | Czech Republic | ||
| OK | CSA | Czech Airlines | CSA-LINES | Czech Republic | |
| CIE | Czech Government Flying Service | CZECH REPUBLIC | Czech Republic | ||
| 8L | CGP | Cargo Plus Aviation | United Arab Emirates | ||
| HNL | CHC Helicopters Netherlands | MAPLELEAF | Netherlands | ||
| 5Z | KEM | CemAir | CEMAIR | South Africa | |
| JLH | Centro de Servicio Aeronautico | CESA | Mexico | ||
| FCB | Cobalt | NEW AGE | Cyprus | ||
| CVK | CAVOK Airlines | CARGO LINE | Ukraine | ||
| XG | CLI | Clickair | CLICKJET | Spain | Merge into Vueling |
| PN | CHB | West Air (China) | WEST CHINA | China | |
| CRN | Carson Air Ltd | CARSON | Canada | Air ambulance operator | |
| DJT | Dreamjet | DREAMJET | France | 2014 [17] | |
| DPJ | Delta Private Jets | JET CARD | United States | Changed from ELJ/ELITE JET in 2014 [18] | |
| DJR | Desert Jet | DESERT FLIGHT | United States | ||
| DLA | Air Dolomiti | DOLOMITI | Italy | ||
| DLC | Dehong South Asian General Aviation | SOARCOPTER | China | Was Ruili Jingcheng Helicopters | |
| DL | DLH | Deutsche Luft Hansa | DEUTSCHE LUFT HANSA | Germany | Became Lufthansa |
| DNS | Dniproaviaservis Company | Ukraine | |||
| DRF | Dream Flyers Training Center | Spain | |||
| DMF | DMCFLY | DEMLY | Mexico | ||
| NAU | Danaus Lineas Aereas | DANAUS | Mexico | ||
| GDF | DF Aviation | Ukraine | |||
| DDA | D & D Aviation | DUSTY | United States | ||
| DNK | D&K Aviation | DIRECT JET | United States | ||
| V5 | VPA | DanubeWings | VIP TAXI | Slovakia | Former names VIP Air and VIP Wings |
| DHE | DAP Helicopteros | HELIDAP | Chile | ||
| VLF | DFS UK Limited | VOLANTE | United Kingdom | ||
| WD | DSR | DAS Air Cargo | DAIRAIR | Uganda | |
| RKC | DAS Airlines | DAS CONGO | Democratic Republic of the Congo | ||
| DX | DTR | DAT Danish Air Transport | DANISH | Denmark | |
| ENT | DAT Enterprise Limited | DATENT | United Kingdom | defunct | |
| BDN | DERA Boscombe Down | GAUNTLET | United Kingdom | ||
| DSN | DESNA | DESNA | Ukraine | ||
| DET | DETA Air | SAMAL | Kazakhstan | ||
| DGO | DGO Jet | DGO JET | Mexico | ||
| DAE | DHL Aero Expreso | YELLOW | Panama | ||
| D0 | DHK | DHL Air Limited | WORLD EXPRESS | United Kingdom | DHL Air UK |
| DHV | DHL Aviation | WORLDSTAR | South Africa | ||
| ES | DHX | DHL International | DILMUN | Bahrain | |
| L3 | JOS | DHL de Guatemala | Guatemala | ||
| RSK | DSWA | REDSKIN | United States | ||
| D3 | DAO | Daallo Airlines | DALO AIRLINES | Djibouti | |
| N2 | DAG | Dagestan Airlines | DAGAL | Russia | |
| DHA | Dahla Airlines | Democratic Republic of Congo | |||
| CA | CCD | Dalian Airlines | XIANGJIAN | China | |
| DCS | DC Aviation | TWIN STAR | Germany | ||
| DCX | Daimler-Chrysler | DAIMLER | United States | ||
| DKA | Daka | Kazakhstan | |||
| DLR | Dala Air Services | DALA AIR | Nigeria | ||
| H8 | KHB | Dalavia | DALAVIA | Russia | |
| DXP | Dallas Express Airlines | DALLAS EXPRESS | United States | ||
| DAS | Damascene Airways | AIRDAM | Syrian Arab Republic | ||
| DSA | Danbury Airways | DANBURY AIRWAYS | United States | ||
| DOP | Dancopter | DANCOPTER | Denmark | ||
| DAF | Danish Air Force | DANISH AIRFORCE | Denmark | ||
| DD | DDL | Danish Air Lines | Denmark | defunct | |
| DAR | Danish Army | DANISH ARMY | Denmark | ||
| DNY | Danish Navy | DANISH NAVY | Denmark | ||
| DNU | Danu Oro Transportas | DANU | Lithuania | ||
| DRT | Darta | DARTA | France | ||
| 0D | DWT | Darwin Airline | DARWIN | Switzerland | |
| DSQ | Dasab Airlines | DASAB AIR | Uganda | ||
| DSH | Dash Air Charter | DASH CHARTER | United States | ||
| GOB | Dash Aviation | PILGRIM | United Kingdom | ||
| DGX | Dasnair | DASNA | Switzerland | ||
| DAB | Dassault Aviation | France | |||
| CVF | Dassault Falcon Jet Corporation | CLOVERLEAF | United States | ||
| DSO | Dassault Falcon Service | DASSAULT | France | ||
| DTN | Data International | DATA AIR | Sudan | ||
| XDT | Date Transformation Corp | United States | |||
| D5 | DAU | Dauair | DAUAIR | Germany | |
| DCO | David Crawshaw Consultants Limited | United Kingdom | |||
| DWN | Dawn Air | DAWN AIR | United States | ||
| DJS | DayJet | DAYJET | United States | ||
| DAY | Daya Aviation | DAYA | Sri Lanka | ||
| DHC | De Havilland | DEHAVILLAND | Canada | ||
| IAY | Deadalos Flugtbetriebs | IASON | Austria | ||
| DAA | Decatur Aviation | DECUR | United States | ||
| DKN | Deccan Charters | DECCAN | India | ||
| JDC | Deere and Company | JOHN DEERE | United States | ||
| DWR | Delaware Skyways | DELAWARE | United States | ||
| DEA | Delta Aerotaxi | JET SERVICE | Italy | ||
| SNO | Delta Air Charter | SNOWBALL | Canada | ||
| ELJ | Delta Private Jets | ELITE JET | United States | Changed to DPJ/JET CARD in 2014 [18] | |
| DL | DAL | Delta Air Lines | DELTA | United States | |
| KMB | Delta Engineering Aviation | KEMBLEJET | United Kingdom | ||
| DLI | Delta Express International | DELTA EXPRESS | Ukraine | ||
| DSU | Delta State University | DELTA STATE | United States | ||
| J7 | DNM | Denim Air | DENIM | Netherlands | Defunct |
| FEC | Denver Express | FALCON EXPRESS | United States | ||
| DJT | Denver Jet | DENVER JET | United States | ||
| FGC | Departament d'Agricultura de la Generalitat de Catalunya | FORESTALS | Spain | ||
| DRY | Deraya Air Taxi | DERAYA | Indonesia | ||
| DRX | Des R Cargo Express | Mauritania | |||
| MIZ | Desarrollo Milaz | MILAZ | Mexico | ||
| DTY | Destiny Air Services | DESTINY | Sierra Leone | ||
| 2A | Deutsche Bahn | Germany | |||
| 1I | AMB | Deutsche Rettungsflugwacht | CIVIL AIR AMBULANCE | Germany | |
| LFO | Deutsches Zentrum fur Luft-und Raumfahrt EV | LUFO | Germany | ||
| DIS | Di Air | DI AIR | Serbia | ||
| SPK | Diamond Aviation | SPARKLE | United States | ||
| DRB | Didier Rousset Buy | DIDIER | Chile | ||
| DGT | Digital Equipment Corporation | DIGITAL | United States | ||
| DIP | Diplomatic Freight Services | DIPFREIGHT | United Kingdom | ||
| ENA | Dirección General de Aviación Civil y Telecomunicasciones | ENA | Spain | ||
| DIA | Direct Air | BLUE SKY | United States | ||
| XAP | Direct Air trading as Midway Connection | MID-TOWN | United States | ||
| DCT | Direct Flight | United Kingdom | |||
| SXP | Direct Fly | EXPRESS SKY | Poland | defunct | |
| AW | DIR | Dirgantara Air Service | DIRGANTARA | Indonesia | |
| DCV | Discover Air | DISCOVER | United States | ||
| DH | DVA | Discovery Airways | DISCOVERY AIRWAYS | United States | |
| XDS | Dispatch Services | United States | |||
| DIX | Dix Aviation | DIX FLIGHT | Germany | ||
| DEE | Dixie Airways | TACAIR | United States | ||
| Z6 | UDN | Dniproavia | DNIEPRO | Ukraine | |
| FDN | Dolphin Air | FLYING DOLPHIN | United Arab Emirates | ||
| IXX | Dolphin Express Airlines | ISLAND EXPRESS | United States | ||
| DPL | Dome Petroleum | DOME | Canada | ||
| YU | ADM | Dominair | DOMINAIR | Dominican Republic | defunct; former IATA code: SS; former name: Aerolíneas Dominicanas, ICAO code no longer allocated |
| MYO | Dominguez Toledo (Grupo Mayoral) | MAYORAL | Spain | ||
| DO | DOA | Dominicana de Aviación | DOMINICANA | Dominican Republic | defunct |
| E3 | DMO | Domodedovo Airlines | DOMODEDOVO | Russia | defunct |
| DVB | Don Avia | DONSEBAI | Kazakhstan | ||
| DON | Donair Flying Club | DONAIR | United Kingdom | ||
| D9 | DNV | Donavia | DONAVIA | Russia | formerly Aeroflot-Don |
| 5D | UDC | DonbassAero | DONBASS AERO | Ukraine | |
| DZ | EPA | Donghai Airlines | DONGHAI AIR | China | |
| DAD | Dorado Air | DORADO AIR | Dominican Republic | ||
| DOR | Dornier | DORNIER | Germany | ||
| DAV | Dornier Aviation Nigeria | DANA AIR | Nigeria | ||
| DOM | Dos Mundos | DOS MUNDOS | Dominican Republic | ||
| DCA | Dreamcatcher Airways | DREAM CATCHER | United Kingdom | ||
| KB | DRK | Druk Air | ROYAL BHUTAN | Bhutan | |
| DRE | Drummond Island Air | MICHIGAN | United States | ||
| DUB | Dubai Airwing | DUBAI | United Arab Emirates | ||
| DBK | Dubrovnik Air | SEAGULL | Croatia | ||
| DUK | Ducair | LION KING | Luxembourg | ||
| DBJ | Duchess of Brittany (Jersey) Limited | DUCHESS | United Kingdom | ||
| LPD | UK Royal/HRH Duke of York | LEOPARD | United Kingdom | ||
| DUN | Dun'Air | DUNAIR | Mauritania | ||
| PHD | Duncan Aviation | PANHANDLE | United States | ||
| VVF | Dunyaya Bakis Hava Tasimaciligi | WORLDFOCUS | Turkey | ||
| DUO | Duo Airways | FLY DUO | United Kingdom | ||
| DJE | Durango Jet | DURANGO JET | Mexico | ||
| DNL | Dutch Antilles Express | DUTCH ANTILLES | Netherlands Antilles | ||
| DCE | Dutch Caribbean Express | DUTCH CARIBBEAN | Netherlands Antilles | ||
| DBR | Dutchbird | DUTCHBIRD | Netherlands | ICAO code allocated to another company, call sign no longer allocated | |
| DBR | Dobrolet LLC | DOBROLET | Russia | Defunct, ICAO code still allocated (2017) | |
| DFS | Dwyer Aircraft Services | DWYAIR | United States | ||
| XDY | Dynair Services | United States | |||
| DNR | Dynamair Aviation | DYNAMAIR | Canada | ||
| DYE | Dynamic Air | DYNAMIC | Netherlands | ICAO code and call sign no longer allocated | |
| DYA | Dynamic Airways | DYNAMIC AIR | United States | ||
| DI | BAG | Dba | SPEEDWAY | Germany | Merged into Air Berlin |
| HO | DKH | Juneyao Air | AIR JUNEYAO | China | |
| EAV | Eagle Airlines Luftverkehrsges | MAYFLOWER | Austria | ||
| ABU | Eagle Aviation Services | United States | |||
| ISL | Eastland Air Services (Flugfélag Austurlands) | EASTLAND | Iceland | 2022 | |
| EBF | Echo Airlines | Bahamas | 2014 [19] | ||
MQ | ENY | Envoy Air | ENVOY | United States | 2014 [19] |
| ENK | Executive Airlink | SUNBIRD | United States | Allocated in 2014 [20] | |
| EL | ELB | Ellinair | ELLINAIR HELLAS | Greece | |
| ELN | Eleron Aviation Company | ELERON | Ukraine | ||
| ECC | Eclair Aviation | ECLAIR | Czech Republic | ||
| ELU | Egyptian Leisure Airlines | EGYPTIAN LEISURE | Egypt | ||
| 9E | EDV | Endeavor Air | ENDEAVOR | United States | |
| MNU | Elite Airways | MAINER | United States | ||
| Europe Jet | EUROPE JET | Turkey | |||
| E1 | Everbread | United Kingdom | |||
| EHD | E H Darby Aviation | PLATINUM AIR | United States | ||
| 1C | Electronic Data Systems | Switzerland | |||
| 1Y | Electronic Data Systems | United States | |||
| EXW | Executive Airlines Services | ECHOLINE | Nigeria | ||
| EFS | EFAOS- Agencia De Viagens e Turismo | EFAOS | Angola | ||
| EFD | Eisele Flugdienst | EVER FLIGHT | Germany | ||
| FSD | EFS-Flugservice | FLUGSERVICE | Germany | ||
| EIS | EIS Aircraft | COOL | Germany | ||
| IAG | EPAG | EPAG | France | ||
| ESI | ESI Eliservizi Italiani | ELISERVIZI | Italy | ||
| EUY | EU Airways | EUROAIRWAYS | Ireland | ||
| VE | EUJ | EUjet | UNION JET | Ireland | defunct |
| ICR | Eagle Aero | ICARUS FLIGHTS | United States | ||
| FEI | Eagle Air | ARCTIC EAGLE | Iceland | ||
| Eagle Air | Indonesia | ||||
| EGR | Eagle Air | EAGLE SIERRA | Sierra Leone | ||
| EFL | Eagle Air | FLYING EAGLE | Tanzania | defunct 2002 | |
| H7 | EGU | Eagle Air | AFRICAN EAGLE | Uganda | |
| NZ | EAG | Eagle Airways | EAGLE | New Zealand | |
| EGX | Eagle Air Company | THAI EAGLE | Thailand | ||
| GYP | Eagle Aviation | GYPSY | United Kingdom | ||
| EGN | Eagle Aviation France | FRENCH EAGLE | France | ||
| EES | Eagle Express | Serbia | 2014 [19] | ||
| 9A | EZX | Eagle Express Air Charter | EAGLEXPRESS | Malaysia | |
| SEG | Eagle International | SEN-EAGLE | Senegal | ||
| EGJ | Eagle Jet Charter | EAGLE JET | United States | ||
| EMD | Eaglemed (Ballard Aviation) | EAGLEMED | United States | ||
| ERX | Earth Airlines Services | EARTH AIR | Nigeria | ||
| S9 | HSA | East African Safari Air | DUMA | Kenya | |
| EXZ | East African Safari Air Express | TWIGA | Kenya | ||
| E3 | EMU | East Asia Airlines | EAST ASIA | Macao | |
| ECT | East Coast Airways | EASTWAY | South Africa | ||
| ECJ | East Coast Jets | EASTCOAST JET | United States | ||
| EHA | East Hampton Aire | AIRE HAMPTON | United States | ||
| EKC | East Kansas City Aviation | BLUE GOOSE | United States | ||
| CTK | East Midlands Helicopters | COSTOCK | United Kingdom | ||
| DXH | East Star Airlines | EAST STAR | China | ||
| EWA | East-West Airlines | EASTWEST | Australia | defunct | |
| ZE | ESR | Eastar Jet | EASTAR | South Korea | |
| EAZ | Eastern Air | EASAIR | Zambia | ||
| EAX | Eastern Air Executive | EASTEX | United Kingdom | ||
| EA | EAL | Eastern Air Lines | EASTERN | United States | defunct |
| EAL | Eastern Air Lines | EASTERN | United States | 2015 [21] | |
| T3 | EZE | Eastern Airways | EASTFLIGHT | United Kingdom | |
| QF | EAQ | Eastern Australia Airlines | EASTERN | Australia | IATA dupe with parent QANTAS. Also uses 2 letter ICAO EA. |
| ECI | Eastern Carolina Aviation | EASTERN CAROLINA | United States | ||
| GNS | Eastern Executive Air Charter | GENESIS | United Kingdom | ||
| LIS | Eastern Express | LARISA | Kazakhstan | ||
| EME | Eastern Metro Express | EMAIR | United States | ||
| EPB | Eastern Pacific Aviation | EAST PAC | Canada | ||
| ESJ | Eastern SkyJets | EASTERN SKYJETS | United Arab Emirates | ||
| DK | ELA | Eastland Air | Australia | ||
| W9 | SGR | Eastwind Airlines | STINGER | United States | defunct |
| FYE | Easy Link Aviation Services | FLYME | Nigeria | ||
| EC | EJU | easyJet Europe | ALPINE | Austria | |
| DS | EZS | easyJet Switzerland | TOPSWISS | Switzerland | |
| U2 | EZY | easyJet UK | EASY | United Kingdom | |
| CMN | Eckles Aircraft | CIMMARON AIRE | United States | ||
| EJT | Eclipse Aviation | ECLIPSE JET | United States | ||
| ECQ | Eco Air | SKYBRIDGE | Nigeria | ||
| DEI | Ecoair | Algeria | |||
| NAK | École Nationale de l'Aviation Civile | ENAC SCHOOL | France | Formerly SFA prior to SEFA ATO being absorbed by the École Nationale de l'Aviation Civile. | |
| ECX | Ecomex Air Cargo | AIR ECOMEX | Angola | ||
| ECD | Ecotour | ECOTOUR | Mexico | ||
| XCC | Ecoturistica de Xcalak | XCALAK | Mexico | ||
| ECV | Ecuatoguineana De Aviación (EGA) | EQUATOGUINEA | Equatorial Guinea | ||
| EQC | Ecuatorial Cargo | ECUA-CARGO | Equatorial Guinea | ||
| ECU | Ecuavia | ECUAVIA | Ecuador | ||
| WK | EDW | Edelweiss Air | EDELWEISS | Switzerland | |
| SLO | Edgartown Air | SLOW | United States | ||
| EDC | Air Charter Scotland | SALTIRE | United Kingdom | Previously: Edinburgh Air Charter | |
| EDJ | Edwards Jet Center of Montana | EDWARDS | United States | ||
| EIJ | Efata Papua Airlines | EFATA | Indonesia | ||
| EUW | EFS European Flight Service | EUROWEST | Sweden | ||
| MS | MSR | Egyptair | EGYPTAIR | Egypt | |
| MSX | Egyptair Cargo | EGYPTAIR CARGO | Egypt | ||
| EGY | Egyptian Air Force | Egypt | |||
| EJX | Egyptian Aviation | Egypt | |||
| EMA | Egyptian Aviation Company | Egypt | |||
| EIX | Ei Air Exports | AIR EXPORTS | Ireland | ||
| EIR | Eirjet | EIRJET | Ireland | ||
| LY | ELY | El Al Israel Airlines | ELAL | Israel | |
| CMX | El Caminante Taxi Aéreo | EL CAMINANTE | Mexico | ||
| GLQ | El Quilada International Aviation | QUILADA | Sudan | ||
| ELS | El Sal Air | EL SAL | El Salvador | ||
| ESC | El Sol De América | SOLAMERICA | Venezuela | ||
| UZ | BRQ | El-Buraq Air Transport | BURAQAIR | Libya | |
| ELX | Elan Express | ELAN | United States | ||
| LBR | Elbe Air Transport | MOTION | Germany | ||
| NLK | Elbrus-Avia Air Enterprise | ELAVIA | Russia | ||
| DND | Eldinder Aviation | DINDER | Sudan | ||
| PDV | Elicar | ELICAR | Italy | ||
| EDO | Elidolomiti | ELIDOLOMITI | Italy | ||
| ELB | Elieuro | ELILOBARDIA | Italy | No longer used | |
| EFG | Elifriulia | ELIFRIULIA | Italy | ||
| ELH | Elilario Italia | LARIO | Italy | ||
| EOA | Elilombarda | LOMBARDA | Italy | ||
| MEE | Elimediterranea | ELIMEDITERRANEA | Italy | ||
| VUL | Elios | ELIOS | Italy | ||
| IEP | Elipiu' | ELIPIU | Italy | ||
| RSA | Elisra Airlines | ESRA | Sudan | ||
| EAI | Elite Air | ELAIR | Togo | ||
| EJD | Elite Jets | ELITE DUBAI | United Arab Emirates | ||
| FGS | Elitellina | ELITELLINA | Italy | ||
| ELT | Elliott Aviation | ELLIOT | United States | ||
| MGG | Elmagal Aviation Services | ELMAGAL | Sudan | ||
| ELR | Elrom Aviation and Investments | Israel | |||
| EAM | Embassy Airlines | EMBASSY AIR | Nigeria | ||
| EFT | Embassy Freight Company | EMBASSY FREIGHT | United States | ||
| EMB | Empresa Brasileira De Aeronáutica | EMBRAER | Brazil | ||
| XSL | Embry-Riddle Aeronautical University | SATSLAB | United States | Sesatlab Proof-of-Concept Flight | |
| EA | EAI | Emerald Airlines | GEMSTONE | Ireland | |
| JEM | Emerald Airways | GEMSTONE | United Kingdom | ||
| EWW | Emery Worldwide Airlines | EMERY | United States | ||
| EMT | Emetebe | EMETEBE | Ecuador | ||
| EK | UAE | Emirates Airlines | EMIRATES | United Arab Emirates | |
| SBC | Emoyeni Air Charter | SABIAN AIR | South Africa | Mount Air | |
| EMP | Empire Air Service | EMPIRE | United States | ||
| EM | CFS | Empire Airlines | EMPIRE AIR | United States | |
| MPR | Empire Aviation Services | Nigeria | |||
| ETP | Empire Test Pilots' School | TESTER | United Kingdom | ||
| AUO | Empresa (Aero Uruguay), S.A. | UNIFORM OSCAR | Uruguay | ||
| PRG | Empresa Aero-Servicios Parrague | ASPAR | Chile | ||
| CRN | Aero Caribbean | AEROCARIBBEAN | Cuba | Merged into Cubana de Aviación in 2015 | |
| VNA | Empresa Aviación Interamericana | EBBA | Uruguay | ||
| EU | EEA | Empresa Ecuatoriana De Aviación | ECUATORIANA | Ecuador | |
| CNI | Empresa Nacional De Servicios Aéreos | SERAER | Cuba | ||
| VNE | Empresa Venezolana | VENEZOLANA | Venezuela | ||
| GTV | Empresa de Aviación Aerogaviota | GAVIOTA | Cuba | ||
| XLT | Empressa Brasileira de Infra-Estrutura Aeroportuaria-Infraero | INFRAERO | Brazil | ||
| ENC | Endecots | ENDECOTS | Ecuador | ||
| ENI | Enimex | ENIMEX | Estonia | ||
| G8 | ENK | Enkor JSC | ENKOR | Russia | |
| EGV | Enrique Gleisner Vivanco | GLEISNER | Chile | ||
| ESE | Ensenada Vuelos Especiales | ENSENADA ESPECIAL | Mexico | ||
| OF | ENT | Enter Air | ENTER | Poland | |
| ENS | Entergy Services | ENTERGY SHUTTLE | United States | ||
| EWS | Enterprise World Airways | WORLD ENTERPRISE | Democratic Republic of the Congo | ||
| E0 | ESS | Eos Airlines | NEW DAWN | United States | |
| EKA | Equaflight Service | EQUAFLIGHT | Republic of the Congo | ||
| EQZ | Equatair Air Services (Zambia) | ZAMBIA CARGO | Zambia | ||
| EQT | Equatorial Airlines | Equatorial Guinea | |||
| ERH | Era Helicopters | ERAH | United States | ||
| IRY | Eram Air | ERAM AIR | Iran | ||
| ERF | Erfoto | ERFOTO | Portugal | ||
| ERE | Erie Airways | AIR ERIE | United States | ||
| B8 | ERT | Eritrean Airlines | ERITREAN | Eritrea | |
| EAD | Escola De Aviacao Aerocondor | AERO-ESCOLA | Portugal | ||
| CTV | Escuela De Pilotos Are Aviación | ARE AVIACION | Spain | ||
| EPC | Espace Aviation Services | ESPACE | Democratic Republic of the Congo | ||
| ERC | Esso Resources Canada | ESSO | Canada | ||
| E7 | ESF | Estafeta Carga Aérea | Mexico | ||
| EEF | Estonian Air Force | ESTONIAN AIR FORCE | Estonia | ||
| OV | ELL | Estonian Air | ESTONIAN | Estonia | |
| ETA | Estrellas Del Aire | ESTRELLAS | Mexico | ||
| ET | ETH | Ethiopian Airlines | ETHIOPIAN | Ethiopia | |
| MJM | Eti 2000 | ELCO ETI | Italy | ||
| EY | ETD | Etihad Airways | ETIHAD | United Arab Emirates | |
| ETM | Etram Air Wing | ETRAM | Angola | ||
| EVN | Euraviation | EURAVIATION | Italy | ||
| ECN | Euro Continental AIE | EURO CONTINENTAL | Spain | ||
| RZ | Euro Exec Express | Sweden | |||
| ESN | Euro Sun | EURO SUN | Turkey | ||
| EAK | Euro-Asia Air | EAKAZ | Kazakhstan | ||
| KZE | Euro-Asia Air International | KAZEUR | Kazakhstan | ||
| MM | MMZ | EuroAtlantic Airways | EUROATLANTIC | Portugal | |
| GOJ | EuroJet Aviation | GOJET | United Kingdom | ||
| EUP | Pan Europeenne Air Service | SAVOY | France | ||
| EUU | Euroamerican Air | EUROAMERICAN | Uruguay | ||
| ECY | Euroceltic Airways | ECHELON | United Kingdom | ||
| EUC | Eurocontrol | Belgium | |||
| ECF | Eurocopter | EUROCOPTER | France | ||
| UI | ECA | Eurocypria Airlines | EUROCYPRIA | Cyprus | |
| GJ | EEZ | Eurofly | E-FLY | Italy | |
| EEU | Eurofly Service | EUROFLY | Italy | ||
| EUG | Euroguineana de Aviación | EUROGUINEA | Equatorial Guinea | ||
| ERJ | Eurojet Italia | JET ITALIA | Italy | ||
| JLN | Eurojet Limited | JET LINE | Malta | ||
| RDP | Eurojet Romania | JET-ARROW | Romania | ||
| EJS | Eurojet Servis | EEJAY SERVICE | Czech Republic | ||
| K2 | ELO | Eurolot | EUROLOT | Poland | |
| 3W | EMX | Euromanx Airways | EUROMANX | Austria | |
| GED | Europe Air Lines | LANGUEDOC | France | ||
| 5O | FPO | Europe Airpost | FRENCH POST | France | |
| EUT | European 2000 Airlines | FIESTA | Malta | ||
| EAG | European Aeronautical Group UK | United Kingdom | defunct | ||
| EA | EAL | European Air Express | STAR WING | Germany | |
| QY | BCS | European Air Transport | POSTMAN | Belgium | |
| E7 | EAF | European Aviation Air Charter | EUROCHARTER | United Kingdom | |
| EBJ | European Business Jets | United Kingdom | |||
| ECB | European Coastal Airlines | COASTAL CLIPPER | Croatia | ||
| ETV | European Executive | EURO EXEC | United Kingdom | ||
| EXC | European Executive Express | ECHO EXPRESS | Sweden | ||
| EBG | Eurosense | EUROSENSE | Bulgaria | ||
| ESX | Euroskylink | CATFISH | United Kingdom | ||
| EW | EWG | Eurowings | EUROWINGS | Germany | |
| 4Y | OCN | Eurowings Discover | OCEAN | Germany | |
| E6 | EWL | Eurowings Europe | Black Pearl | Malta | |
| BR | EVA | EVA Air | EVA | Taiwan | |
| EVE | Evelop Airlines | EVELOP | Spain | ||
| EVK | Everett Aviation | EVERETT | Kenya | [19] | |
| EVT | Everett Limited | Tanzania | |||
| EZ | EIA | Evergreen International Airlines | EVERGREEN | United States | |
| VTS | Everts Air Alaska/Everts Air Cargo | EVERTS | United States | ||
| EVL | Evolem Aviation | EVOLEM | France | ||
| ZD | EWR | Ewa Air | MAYOTTE AIR | France | |
| EMN | Examiner Training Agency | AGENCY | United Kingdom | ||
| JN | XLA | Excel Airways | EXPO | United Kingdom | |
| XEL | Excel Charter | HELI EXCEL | United Kingdom | ||
| GZA | Excellent Air | EXCELLENT AIR | Germany | ||
| MB | EXA | Execair Aviation | CANADIAN EXECAIRE | Canada | |
| VCN | Execujet Charter | AVCON | Switzerland | ||
| EJO | Execujet Middle East | MIDJET | United Arab Emirates | ||
| VMP | Execujet Scandinavia | VAMPIRE | Denmark | ||
| LFL | Executive Air | LIFE FLIGHT | Zimbabwe | ||
| EAC | Executive Air Charter | EXECAIR | United States | ||
| XAF | Executive Air Fleet | United States | |||
| ECS | Executive Aircraft Charter and Charter Services | ECHO | Ireland | ||
| XAH | Executive Aircraft Services | United Kingdom | |||
| OW | EXK | Executive Airlines | EXECUTIVE EAGLE | United States | American Eagle |
| EXU | Executive Airlines | SACAIR | Spain | ||
| JTR | Executive Aviation Services | JESTER | United Kingdom | ||
| EXE | Executive Flight | EXEC | United States | ||
| TRI | Executive Flight Operations Ontario Government | TRILLIUM | Canada | ||
| EXJ | Executive Jet Charter | United Kingdom | |||
| EJM | Executive Jet Management | JET SPEED | United States | ||
| TEA | Executive Turbine Aviation | TRAVELMAX | South Africa | ||
| EXF | Eximflight | EXIMFLIGHT | Mexico | ||
| EXN | Exin | EXIN | Poland | ||
| EXR | Expertos En Carga | EXPERTOS ENCARGA | Mexico | ||
| FXA | Express Air | EFFEX | United States | ||
| EIC | Express International Cargo | EXCARGO | São Tomé and Príncipe | ||
| XPL | Express Line Aircompany | EXPRESSLINE | United States | ||
| XNA | Express Net Airlines | EXPRESSNET | United States | ||
| EO | LHN | Express One International | LONGHORN | United States | defunct |
| XTO | Express Tours | EXPRESS TOURS | Canada | ||
| EV | ASQ | ExpressJet | ACEY | United States | |
| XSL | Excel-Aire Service | EXCELAIRE | United States | ||
| LTD | Executive Express Aviation/JA Air Charter | LIGHT SPEED | United States | ||
| XSR | Executive Flight Services | AIRSHARE | United States | ||
| EPR | Express Airways | EMPEROR | Slovenia | ||
| XRO | ExxAero | CRAMER | Netherlands | ||
| JTM | Exxavia Limited | SKYMAN | Ireland | ||
| EZJ | Ezjet GT | GUYANA JET | Guyana | ||
| 8K | EVS | Exploits Valley Air Services | EVAS | Canada | |
| FRX | Fort Aero | FORT AERO | Estonia | ||
| PBR | Fast Air | POLAR BEAR | Canada | ||
| SRE | Fly Jetstream Aviation | STREAMJET | South Africa | ||
| FTZ | Fastjet | GREY BIRD | Tanzania | ||
| FAP | F Air | FAIR SCHOOL | Czech Republic | ||
| FFL | ForeFlight | FOREFLIGHT | United States | 3rd party Privacy ICAO Address (PIA) callsign used to obscure true airplane registrations | |
| EYE | F.S. Air Service | SOCKEYE | United States | ||
| IFA | FAI Air Service | RED ANGEL | Germany | ||
| FLC | FINFO Flight Inspection Aircraft | FLIGHT CHECK | United States | ||
| FKI | FLM Aviation Mohrdieck | KIEL AIR | Germany | ||
| DCM | FLTPLAN (anonymized service) | DOT COM | United States | 3rd party Privacy ICAO Address (PIA) callsign used to obscure true airplane registrations | |
| FLW | FLowair Aviation | QUICKFLOW | France | ||
| FMG | FMG Verkehrsfliegerschule Flughafen Paderborn-Lippstadt | HUSKY | Germany | ||
| FRA | FR Aviation | RUSHTON | United Kingdom | ||
| FSB | FSB Flugservice & Development | SEABIRD | Germany | ||
| LEJ | FSH Luftfahrtunternehmen | LEIPZIG FAIR | Germany | ||
| FBA | Fab Air | FAB AIR | Kyrgyzstan | ||
| FCS | Facts Air | MEXFACTS | Mexico | ||
| FAV | Fair Aviation | FAIRAVIA | South Africa | ||
| FWD | Fair Wind Air Charter | FAIR WIND | United Arab Emirates | ||
| FLS | Fairlines | FAIRLINE | Netherlands | Defunct | |
| FFC | Fairoaks Flight Centre | FAIROAKS | United Kingdom | ||
| FWY | Fairways Corporation | FAIRWAYS | United States | ||
| FCN | Falcon Air | FALCON | Sweden | ||
| FAR | Falcon Air | FALCAIR | Slovenia | ||
| FAO | Falcon Air Express | PANTHER | United States | ||
| FAU | Falcon Airline | FALCON AIRLINE | Nigeria | ||
| FBU | French Bee | FRENCH BEE | France | ||
| IH | Falcon Aviation | Sweden | |||
| FVS | Falcon Aviation Services | FALCON AVIATION | United Arab Emirates | ||
| FJC | Falcon Jet Centre | FALCONJET | United Kingdom | ||
| FAW | Falwell Aviation | FALWELL | United States | ||
| FE | FEA | Far Eastern Air Transport | Far Eastern | Taiwan | |
| FD | Royal Flying Doctor Service | FLYDOC | Australia | ||
| FDL | Farmingdale State University | FARMINGDALE STATE | United States | ||
| FAH | Farnair Hungary | BLUE STRIP | Hungary | ||
| FRN | Farnair Netherlands | FARNED | Netherlands | Defunct, ICAO code in use by another company | |
| FAT | ASL Airlines Switzerland | FARNER | Switzerland | Previously: Farnair Switzerland | |
| RAF | Farnas Aviation Services | FARNAS | Sudan | ||
| HBL | Faroecopter | HELIBLUE | Denmark | ||
| F6 | RCK | FaroeJet | ROCKROSE | Faroe Islands | |
| FRW | Farwest Airlines | FARWEST | United States | ||
| F3 | FSW | Faso Airways | FASO | Burkina Faso | |
| FHL | Fast Helicopters | FINDON | United Kingdom | ||
| FAY | Fayban Air Services | FAYBAN AIR | Nigeria | ||
| SKM | Fayetteville Flying Service and Scheduled Skyways System | SKYTEM | United States | ||
| FDR | Federal Air | FEDAIR | South Africa | ||
| FLL | Federal Airlines | FEDERAL AIRLINES | Sweden | ||
| DCN | Federal Armed Forces | DIPLOMATIC CLEARANCE | Germany | ||
| FRM | Federal Armored Service | FEDARM | United States | ||
| NHK | Federal Aviation Administration | NIGHTHAWK | United States | ||
| FX | FDX | FedEx Express | FEDEX | United States | |
| FNK | Feniks Airline | AURIKA | Kazakhstan | ||
| FER | Feria Aviación | FERIA | Spain | ||
| N8 | HGK | Fika Salaama Airlines | SALAAMA | Uganda | |
| 4S | FNC | Finalair Congo | FINALAIR CONGO | Republic of the Congo | |
| FAK | Financial Airxpress | FACTS | United States | ||
| FBF | Fine Airlines | FINE AIR | United States | ||
| FTR | Finist'air | FINISTAIR | France | ||
| AY | FIN | Finnair | FINNAIR | Finland | |
| FC | WBA | Finncomm Airlines | WESTBIRD | Finland | |
| FNF | Finnish Air Force | FINNFORCE | Finland | ||
| FIH | FinnHEMS | FINNHEMS | Finland | [22] | |
| FY | FFM | Firefly | FIREFLY | Malaysia | |
| 7F | FAB | First Air | FIRST AIR | Canada | |
| JRF | First Air Transport | Japan | |||
| FCC | First Cambodia Airlines | FIRST CAMBODIA | Cambodia | ||
| FCA | Fly-Coop Air Service | COOPAIR | Hungary | ||
| MBL | First City Air | FIRST CITY | United Kingdom | ||
| GGA | First Flying Squadron | JAWJA | United States | ||
| FIR | First Line Air | FIRSTLINE AIR | Sierra Leone | ||
| FTS | First Sabre | FIRST SABRE | Mexico | ||
| 8F | FFR | Fischer Air | FISCHER | Czech Republic | |
| FFP | Fischer Air Polska | FLYING FISH | Poland | ||
| 8D | EXV | FitsAir | EXPOAVIA | Sri Lanka | |
| FSX | Flagship Express Services | FLAG | United States | ||
| F8 | FLE | Flair Airlines | FLAIR | Canada | |
| WAF | Flamenco Airways | FLAMENCO | United States | ||
| FMR | Flamingo Air | FLAMINGO AIR | United States | ||
| FLN | Flamingo Air-Line | ILIAS | Kazakhstan | ||
| FSH | Flash Airlines | FLASH | Egypt | ||
| BWY | Fleet Requirements Air Direction Unit | BROADWAY | United Kingdom | ||
| FLR | Fleetair | FLEETAIR | South Africa | ||
| FXY | Flexair | FLEXY | Netherlands | Defunct | |
| FXT | Flexflight | Denmark | |||
| TUD | Flight Alaska | TUNDRA | United States | ||
| FCK | FCS Flight Calibration Services | NAV CHECKER | Germany | ||
| VOR | Flight Calibration Services Ltd. | FLIGHT CAL | United Kingdom | ||
| FCV | Flight Centre Victoria | NAVAIR | Canada | ||
| FCP | Nelson Aviation College Ltd | FLIGHTCORP | New Zealand | Nelson Aviation College Archived 2017-06-07 at the Wayback Machine | |
| FDP | Flight Dispatch Services | Poland | |||
| FLX | Flight Express, Inc. | FLIGHT EXPRESS | United States | ||
| CFI | Flight Inspection Center of the General Administration of Civil Aviation in China | CHINA JET | China | ||
| LTS | Flight Inspections and Systems | SPECAIR | Russia | ||
| IVJ | Flight International | INVADER JACK | United States | ||
| MIT | Flight Line | MATCO | United States | ||
| FOI | Flight Ops International | United States | |||
| OPT | Flight Options | OPTIONS | United States | ||
| CLB | Flight Precision Limited | CALIBRATOR | United Kingdom | ||
| FSL | Flight Safety Limited | FLIGHTSAFETY | United Kingdom | ||
| FSU | Flight Support Sweden | Sweden | |||
| CCK | Flight Trac | CABLE CHECK | United States | ||
| AYR | Flight Training Europe | CYGNET | Spain | ||
| FWQ | Flight West Airlines | UNITY | Australia | ||
| KLO | Flight-Ops International | KLONDIKE | Canada | ||
| CSK | Flightcraft | CASCADE | United States | ||
| FEX | Flightexec | FLIGHTEXEC | Canada | ||
| B5 | FLT | Flightline | FLIGHTLINE | United Kingdom | defunct |
| FTL | Flightline | FLIGHT-AVIA | Spain | ||
| FPS | Flightpass Limited | FLIGHTPASS | United Kingdom | ||
| FSR | Flightstar Corporation | FLIGHTSTAR | United States | ||
| KDZ | Flightworks | KUDZU | United States | Avior Technologies Operations | |
| FAZ | Flint Aviation Services | FLINT AIR | United States | ||
| KWX | Florida Aerocharter | KAY DUB | United States | Allocated in 2014 | |
| OJY | Florida Air | OHJAY | United States | ||
| FAS | Florida Air Cargo | FLORIDA CARGO | United States | Allocated in 2014 | |
| PA | FCL | Florida Coastal Airlines | FLORIDA COASTAL | United States | |
| FFS | Florida Department of Agriculture | FORESTRY | United States | ||
| FJS | Florida Jet Service | FLORIDAJET | United States | ||
| RF | FWL | Florida West International Airways | FLO WEST | United States | merged into Atlas Air Worldwide Holdings; defunct as of 28 February 2017, IATA code now allocated to another user |
| FFG | Flugdienst Fehlhaber | WITCHCRAFT | Germany | ||
| FLU | Flugschule Basel | YELLOW FLYER | Switzerland | ||
| EZB | Flugschule Eichenberger | EICHENBURGER | Switzerland | ||
| FWZ | Flugwerkzeuge Aviation Software | Austria | |||
| VNX | Fly Advance | VANCE | United States | Allocated in 2014 [23] | |
| F2 | FLM | Fly Air | FLY WORLD | Turkey | |
| 8W | EDR | Fly All Ways | BIRDVIEW | Suriname | |
| G6 | ACY | Fly Arna | ARNA | Armenia | |
| FCT | Fly CI Limited | DEALER | United Kingdom | ||
| FEE | Fly Europa Limited | FLY EURO | United Kingdom | ||
| FXL | Fly Excellent | FLY EXCELLENT | Sweden | ||
| 9Y | FGE | Fly Georgia | GEORGIA WING | Georgia | |
| NVJ | Fly International Airways | NOUVINTER | Tunisia | ||
| OJ | FJM | Fly Jamaica Airways | GREENHEART | Jamaica | defunct |
| 9P | FJL | Fly Jinnah | Okaab | Pakistan | |
| FIL | Fly Line | FLYLINE | Spain | ||
| SH | FLY | Fly Me Sweden | FLYBIRD | Sweden | |
| FP | PVV [24] [25] | Fly Pro | Sunday | Moldova | |
| FRB | Fly Rak | RAKWAY | United Arab Emirates | ||
| 6P | IAD | Fly Wex | FLYWEX | Italy | |
| F6 | VAW | Fly2Sky | SOFIA JET | Bulgaria | |
| FYA | Flyant | FLYANT | Spain | ||
| D7 | XFA | FlyAsianXpress | FAX AIR | Malaysia | |
| F7 | BBO | Flybaboo | BABOO | Switzerland | |
| BE | BEE | Flybe | JERSEY | United Kingdom | Formerly Jersey European Airways |
| FO | FBZ | Flybondi | BONDI | Argentina | |
| FCE | Flycolumbia | FLYCOLUMBIA | Spain | ||
| FT | FEG | FlyEgypt | SKY EGYPT | Egypt | |
| GVG | Flygaktiebolaget Gota Vingar | BLUECRAFT | Sweden | ||
| Y2 | GSM | Flyglobespan | GLOBESPAN | United Kingdom | defunct |
| FPA | Flygprestanda | Sweden | |||
| SX | TOR | FlyGTA Airlines | HOMERUN | Canada | |
| ETS | Flygtransporter I Nykoping | EXTRANS | Sweden | ||
| INU | Flyguppdraget Backamo | INSTRUCTOR | Sweden | ||
| W3 | FYH | Flyhy Cargo Airlines | FLY HIGH | Thailand | |
| FCR | Flying Carpet Company | FLYING CARPET | Lebanon | ||
| FYG | Flying Service | FLYING GROUP | Belgium | ||
| FGP | Flying-Research Aerogeophysical Center | FLYING CENTER | Russia | ||
| TE | LIL | FlyLal | LITHUANIA AIR | Lithuania | defunct |
| FLK | Flylink Express | FLYLINK | Spain | ||
| XY | KNE | Flynas | NAS EXPRESS | Saudi Arabia | |
| LF | NDC | FlyNordic | NORDIC | Sweden | defunct |
| FP | FRE | FlyPelican | PELICAN | Australia | Pelican Airlines Pty Ltd since 1 June 2015 |
| FS | FOX | Flyr | GREENSTAR | Norway | |
| FTM | Flyteam Aviation | FLYTEAM | United Kingdom | ||
| VK | FVK | FlyViking | BALDER | Norway | defunct |
| FMI | FMI Air | FIRST MYANMAR | Myanmar | ||
| FKS | Focus Air | FOCUS | United States | Omega Air Holdings | |
| FOP | Fokker | Netherlands | Flight Operations | ||
| NOF | Fonnafly | FONNA | Norway | ||
| FOB | Ford Motor Company | FORDAIR | United Kingdom | ||
| VY | FOS | Formosa Airlines | Taiwan | defunct | |
| FOR | Formula One Management | FORMULA | United Kingdom | ||
| FHS | Forth and Clyde Helicopter Services | HELISCOT | United Kingdom | ||
| FXC | Fortunair Canada | AIR FUTURE | Canada | ||
| BN | Forward Air International Airlines | United States | |||
| FSA | Foster Aviation | FOSTER-AIR | United States | ||
| JFY | Foster Yeoman | YEOMAN | United Kingdom | ||
| FTE | Fotografia F3 | FOTOGRAFIA | Spain | ||
| 5F | FIA | FlyOne | FIA | Moldova | Allocated in 2016 |
| 3F | FIE | FlyOne Armenia | ARMRIDER | Armenia | |
| HK | FSC | Four Star Aviation / Four Star Cargo | FOUR STAR | United States | Virgin Islands |
| WDS | Four Winds Aviation | WINDS | United States | ||
| FXR | Foxair | WILDFOX | Italy | ||
| FDO | France Douanes | FRENCH CUSTOM | France | ||
| FH | FHY | Freebird Airlines | FREEBIRD AIR | Turkey | |
| SJ | FOM | Freedom Air | FREE AIR | New Zealand | defunct |
| FP | FRE | Freedom Air | FREEDOM | United States | Aviation Services |
| FFF | Freedom Air Services | INTER FREEDOM | Nigeria | ||
| FRL | Freedom Airlines | FREEDOM AIR | United States | ICAO Code and callsign withdrawn | |
| FAS | Freedom Airways | FREEDOM AIRWAYS | Cyprus | ||
| FWC | Freeway Air | FREEWAY | Netherlands | Defunct | |
| FRG | Freight Runners Express | FREIGHT RUNNERS | United States | ||
| FAF | Force Aerienne Francaise | FRENCH AIR FORCE | France | ||
| FMY | Aviation Legere De L'Armee De Terre | FRENCH ARMY | France | ||
| FNY | France Marine Nationale | FRENCH NAVY | France | ||
| FRR | Fresh Air | FRESH AIR | Nigeria | ||
| BZY | Fresh Air Aviation | BREEZY | United States | 2015 [26] | |
| FAE | Freshaer | WILDGOOSE | United Kingdom | ||
| FAL | Friendship Air Alaska | FRIENDSHIP | United States | ||
| FLF | Friendship Airlines | FRIEND AIR | Uganda | ||
| FGY | Froggy Corporate Aviation | Australia | |||
| F9 | FFT | Frontier Airlines | FRONTIER FLIGHT | United States | |
| ITR | Frontier Commuter | OUT BACK | United States | ||
| 2F | FTA | Frontier Flying Service | FRONTIER-AIR | United States | |
| FNG | Frontier Guard | FINNGUARD | Finland | ||
| FUJ | Fujairah Aviation Centre | FUJAIRAH | United Arab Emirates | ||
| CFJ | Fujian Airlines | FUJIAN | China | ||
| GAX | Full Express | GRAND AIRE | United States | ||
| FAM | Fumigación Aérea Andaluza | FAASA | Spain | ||
| FFY | Fun Flying Thai Air Service | FUN FLYING | Thailand | ||
| ROG | Fundació Rego | REGO | Spain | ||
| FUN | Funtshi Aviation Service | FUNTSHI | Democratic Republic of the Congo | ||
| FGL | Futura Gael | Applewood | Ireland | defunct | |
| FH | FUA | Futura International Airways | FUTURA | Spain | defunct |
| FZ | FDB | Flydubai | SKYDUBAI | UAE | |
| FWK | Flightworks | United States | |||
| ACT | Flight Line | AMERICAN CHECK | United States | ||
| FRF | Fleet Air International | FAIRFLEET | Hungary | ||
| FUM | Fuxion Line Mexico | FUNLINE | Mexico | ||
| FWR | FlightAware | FLIGHT AWARE | United States | 3rd party Privacy ICAO Address (PIA) callsign used to obscure true airplane registrations | |
| GML | G & L Aviation | GEEANDEL | South Africa | ||
| DBC | Gemini Air Group | DIAMOND BACK | United States | Allocated in 2014 [27] | |
| GOP | Gospa Air | GOSPA AIR | Mexico | ||
| HGT | GMJ Air Shuttle | HIGHTECH | United States | Private air shuttle for Intel Corporation Employees | |
| GRE | Greenlandcopter | Denmark | |||
| GMQ | Germania Express | CORGI | Germany | ||
| KNM | GB Helicopters | KINGDOM | United Kingdom | ||
| GCW | Global Air Crew | GLOBALCREW | Denmark | ||
| GBH | Global Avia Handling | Russia | |||
| Y5 | GMR | Golden Myanmar Airlines | GOLDEN MYANMAR | Myanmar | |
| EXH | G5 Executive | BATMAN | Switzerland | ||
| MTA | GAK/Mitchell Aero | GAK AVIATION | United States | ||
| GGS | GATSA | GATSA | Mexico | ||
| GBX | GB Airlink | ISLAND TIGER | United States | ||
| GT | GBL | GB Airways | GEEBEE AIRWAYS | United Kingdom | |
| GCS | GCS Air Service | GALION | United States | ||
| FFU | GEC Marconi Avionics | FERRANTI | United Kingdom | ||
| GCC | GECAS | GECAS | Ireland | ||
| GEN | GENSA | GENSA-BRASIL | Brazil | ||
| GET | Get High | AIR FLOW | Portugal | ||
| GET | GETRA | GETRA | Equatorial Guinea | ICAO Code no longer allocated | |
| GFW | GFW Aviation | Australia | |||
| GGT | Trans Island Airways | THUNDERBALL | Bahamas | ||
| GHI | GH Stansted Limited | United Kingdom | |||
| Z5 | GMG | GMG Airlines | GMG | Bangladesh | |
| GPE | GP Express Airlines | REGIONAL EXPRESS | United States | ||
| GPR | GPM Aeroservicio | GPM AEROSERVICIO | Mexico | ||
| GIB | GR-Avia | GRAVIA | Guinea | ||
| BMK | GST Aero Aircompany | MURAT | Kazakhstan | ||
| GTX | GTA Air | BIG-DEE | United States | ||
| GAH | Ga-Ma Helicoptere | GAMHELICO | France | ||
| GBE | Gabon Express | GABEX | Gabon | ||
| GRT | Gabon-Air-Transport | Gabon | |||
| GIG | Gacela Air Cargo | GACELA AIR | Mexico | ||
| GFC | Gail Force Express | GAIL FORCE | United States | ||
| GNJ | Gain Jet Aviation | HERCULES JET | Greece | ||
| SWF | Galair International | GALAIR | United Kingdom | ||
| GLS | Galaircervis | GALS | Ukraine | ||
| 7O | GAL | Galaxy Air | GALAXY | Kyrgyzstan | |
| GXY | Galaxy Airlines | GALAX | Japan | ||
| GAS | Galena Air Service | GALENA AIR SERVICE | United States | ||
| 1G | Galileo International | United States | |||
| GMA | Gama Aviation | GAMA | United Kingdom | ||
| GCH | Gama Aviation Switzerland | GAMA SWISS | Switzerland | ||
| GC | GNR | Gambia International Airlines | GAMBIA INTERNATIONAL | Gambia | |
| NML | Gambia New Millennium Air | NEWMILL | Gambia | ||
| GMJ | Gamisa Aviación | GAMISA | Spain | ||
| G7 | GNF | Gandalf Airlines | Gandalf | Italy | |
| GAN | Gander Aviation | GANAIR | Canada | ||
| GSA | Garden State Airlines | GARDEN STATE | United States | ||
| AHM | Garrison Aviation | AIR HURON | Canada | ||
| GA | GIA | Garuda Indonesia | INDONESIA | Indonesia | |
| GHS | Gatari Hutama Air Services | GATARI | Indonesia | ||
| EGO | Gauteng Air Cargo | GAUTENG | South Africa | ||
| GVN | Gavina | GAVINA | Spain | ||
| 4G | GZP | Gazpromavia | GAZPROMAVIA | Russia | |
| GEE | Geesair | GEESAIR | Canada | ||
| GLX | Gelix Airlines | RUSSIAN BIRD | Russia | ||
| GR | GCO | Gemini Air Cargo | GEMINI | United States | |
| GAB | Gendall Air | GENDALL | Canada | ||
| GDB | Gendarmerie Belge | BELGIAN GENERMERIE | Belgium | ||
| FGN | National Gendarmerie | FRANCE GENDARME | France | ||
| SWK | General Aerospace | SKYWALKER | Canada | ||
| GWS | General Airways | GENAIR | South Africa | ||
| GNZ | General Aviation | GONZO | Poland | ||
| GTH | General Aviation Flying Services | GOTHAM | United States | ||
| XGA | General Aviation Terminal | Canada | |||
| GMC | General Motors | GENERAL MOTORS | United States | ||
| GNX | Genex | Belarus | |||
| GSL | Geographic Air Surveys | SURVEY-CANADA | Canada | ||
| A9 | TGZ | Georgian Airways | TAMAZI | Georgia | |
| FGA | Georgian Aviation Federation | GEORGIA FED | Georgia | ||
| GGF | Georgian Cargo Airlines Africa | GEORGIAN AFRICA | Senegal | ||
| QB | GFG | Georgian National Airlines | NATIONAL | Georgia | |
| Great Barrier Airlines | New Zealand | Not ICAO allocated – GBA issued for domestic use by the Civil Aviation Authority of New Zealand | |||
| GAF | German Air Force | GERMAN AIR FORCE | Germany | ||
| GAM | German Army | GERMAN ARMY | Germany | ||
| GNY | German Navy | GERMAN NAVY | Germany | ||
| HE | LGW | German Airways | WALTER | Germany | Former name: Luftfahrtgesellschaft Walter |
| GHY | German Sky Airlines | GERMAN SKY | Germany | ||
| ST | GMI | Germania | GERMANIA | Germany | |
| 4U | GWI | Germanwings | GERMAN WINGS | Germany | |
| GDN | Gerry's Dnata | Pakistan | |||
| GFD | Gesellschaft Fur Flugzieldarstellung | KITE | Germany | ||
| GP | RIV | APG Airlines | RIVERA | France | |
| GES | Gestair | GESTAIR | Spain | ||
| GTR | Gestar | STAR GESTAR | Chile | ||
| GJT | Gestión Aérea Ejecutiva | BANJET | Spain | ||
| GHT | Ghadames Air Transport | Libya | |||
| GH | GLP | Globus Airlines | GLOBUS | Russia | |
| GH | GHA | Ghana Airways | GHANA | Ghana | defunct |
| G0 | GHB | Ghana International Airlines | GHANA AIRLINES | Ghana | |
| NTC | Gibson Aviation | NIGHT CHASE | United States | ||
| RPS | Global Air Charter | RESPONSE | United States | ||
| GAG | Greybird Pilot Academy | GEEBIRD | Denmark | ||
| DMJ | Global Air | DAMOJH | Mexico | defunct | |
| GBS | Global Air Services Nigeria | GLOBAL SERVE | Nigeria | ||
| GLC | Global Aircargo | Bahrain | |||
| Global Airways (Turks and Caicos) | Turks and Caicos Islands | ||||
| BSP | Global Airways (BSP) | Democratic Republic of Congo | |||
| GLB | Global Airways (GLB) | GLO-AIR | United States | Air Castle Corporation | |
| GBB | Global Aviation Operations | GLOBE | South Africa | ||
| GAK | Global Aviation and Services Group | AVIAGROUP | Libya | ||
| GGZ | Global Georgian Airways | GLOBAL GEORGIAN | Georgia | ||
| GLJ | Global Jet Austria | GLOBAL JET AUSTRIA | Austria | ||
| NSM | Global Jet Corporation | THUNDERCLOUD | United States | ||
| SVW | Global Jet Luxembourg | SILVER ARROWS | Luxembourg | ||
| GSK | Global Sky Aircharter | GLOBAL SKY | United States | ||
| GSS | Global Supply Systems | JET LIFT | United Kingdom | ||
| XGS | Global System | United States | |||
| XGW | Global Weather Dynamics | United States | |||
| GLW | Global Wings | Japan | |||
| GJA | Globe Jet | Lebanon | |||
| GAC | GlobeAir | DREAM TEAM | Austria | ||
| 6G | RLX | Go2Sky | RELAX | Slovakia | |
| G8 | GOW | GoAir | GOAIR | India | |
| GK | Go One Airways | United Kingdom | Defunct? | ||
| G7 | GJS | GoJet Airlines | LINDBERGH | United States | |
| GGE | Gobierno De Guinea Ecuatorial | Equatorial Guinea | |||
| GOF | Gof-Air | GOF-AIR | Mexico | ||
| GOI | Gofir | SWISS HAWK | Switzerland | ||
| G3 | GLO | Gol Transportes Aéreos | GOL TRANSPORTE | Brazil | Brazilian low-cost airline. |
| GBT | Gold Belt Air Transport | GOLD BELT | Canada | defunct | |
| GDA | GoldAir | AIR PARTNER | United Kingdom | ||
| GDK | Goldeck-Flug | GOLDECK FLUG | Austria | ||
| DC | GAO | Golden Air | GOLDEN | Sweden | |
| GDD | Golden Airlines | GOLDEN AIRLINES | United States | ||
| GPA | Golden Pacific Airlines | GOLDEN PAC | United States | ||
| GRS | Golden Rule Airlines | GOLDEN RULE | Kyrgyzstan | ||
| GLD | Golden Star Air Cargo | GOLDEN STAR | Sudan | ||
| GOS | Goldfields Air Services | Australia | |||
| GAQ | Golfe Air Quebec | GOLFAIR | Canada | ||
| GLE | Goliaf Air | GOLIAF AIR | São Tomé and Príncipe | ||
| GOM | Gomel Airlines | GOMEL | Belarus | ||
| 5Z | GON | Gonini Air Services | GONINI | Suriname | defunct |
| RDR | Goodridge (UK) Limited | RED STAR | United Kingdom | ||
| G1 | Gorkha Airlines | GORKHA AIRLINES | Nepal | ?ICAO | |
| GOR | Gorlitsa Airlines | GORLITSA | Ukraine | ||
| HKG | Government Flying Service | HONGKONG GOVERNMENT | Hong Kong SAR of China | ||
| GRZ | Government of Zambia Communications Flight | COM FLIGHT | Zambia | ||
| HLD | Grampian Flight Centre | GRANITE | United Kingdom | ||
| GAV | Granada Aviación | GRANAVI | Spain | ||
| GAE | Grand Aire Express | GRAND EXPRESS | United States | ||
| GND | Grand Airways | GRAND VEGAS | United States | ||
| CVU | Grand Canyon Airlines | CANYON VIEW | United States | ||
| GV | GUN | Grant Aviation | HOOT | United States | |
| LMK | Grantex Aviation | LANDMARK | United Kingdom | ||
| GRA | Great American Airways | GREAT AMERICAN | United States | Defunct | |
| GRA | Guardian Air Asset Management | FLEX | South Africa | issued in 2017 | |
| ZK | GLA | Great Lakes Airlines | LAKES AIR | United States | |
| GLU | Great Lakes Airways (Uganda) | LAKES CARGO | Uganda | ||
| GRP | Great Plains Airlines | GREAT PLAINS | United States | ||
| IJ | GWL | Great Wall Airlines | GREAT WALL | China | |
| GWA | Great Western Air | G-W AIR | United States | ||
| HB | HGB | Greater Bay Airlines | GREATER BAY | Hong Kong | |
| HNA | Greek Navy | HELLENIC NAVY | Greece | ||
| GFF | Griffin Aviation | GRIFFIN AIR | Cyprus | ||
| GXA | Grixona | GRIXONA | Moldova | ||
| GZD | Grizodubova Air Company | GRIZODUBOVA AIR | Russia | ||
| HTG | Grossmann Air Service | GROSSMANN | Austria | ||
| GSJ | Grossmann Jet Service | GROSSJET | Czech Republic | ||
| GHV | Ground Handling Service de Mexico | GROUND HANDLING | Mexico | ||
| GPM | Grup Air-Med | GRUPOMED | Spain | ||
| EJC | Grupo De Aviación Ejecutiva | GRUPOEJECUTIVA | Mexico | ||
| TAT | Grupo TACA | TACA-COSTARICA | Costa Rica | ||
| VMM | Grupo Vuelos Mediterraneo | VUELOS MED | Spain | ||
| GMT | Grupo Aéreo Monterrey | GRUPOMONTERREY | Mexico | ||
| GSY | Guard Systems | GUARD AIR | Norway | ||
| G6 | BSR | Guine Bissaur Airlines | BISSAU AIRLINES | Guinea-Bissau | |
| GIJ | Guinea Airways | GUINEA AIRWAYS | Guinea | ||
| GNC | Guinea Cargo | GUINEA CARGO | Equatorial Guinea | ||
| J9 | GIF | Guinee Airlines | GUINEE AIRLINES | Guinea | defunct |
| GEA | Guinea Ecuatorial Airlines | GEASA | Equatorial Guinea | ||
| GIQ | Guinee Paramount Airlines | GUIPAR | Guinea | ||
| CGH | Guizhou Airlines | GUIZHOU | China | ||
| GUS | Guja | GUJA | Mexico | ||
| G8 | GUJ | Gujarat Airways | GUJARATAIR | India | |
| TSU | Gulf & Caribbean Cargo / Contract Air Cargo | TRANSAUTO | United States | ||
| GUF | Gulf African Airlines | GULF AFRICAN | The Gambia | ||
| GF | GFA | Gulf Air | GULF AIR | Bahrain | |
| GAT | Gulf Air Inc | GULF TRANS | United States | ||
| GCN | Gulf Central Airlines | GULF CENTRAL | United States | ||
| SFY | Gulf Flite Center | SKY FLITE | United States | ||
| GPC | Gulf Pearl Air Lines | AIR GULFPEARL | Libya | ||
| GLF | Gulfstream Aerospace | GULFSTREAM TEST | United States | ||
| GFS | Gulfstream Airlines | GULFSTAR | United States | ||
| GFT | Gulfstream International Airlines | GULF FLIGHT | United States | ||
| GUL | Gull Air | GULL-AIR | United States | ||
| GUM | Gum Air | GUM AIR | Suriname | ||
| GDH | Guneydogu Havacilik Isletmesi | RISING SUN | Turkey | ||
| GY | Guyana Airways 2000 | ||||
| GWN | Gwyn Aviation | GWYN | United Kingdom | ||
| H4 | Héli Sécurité Helicopter Airlines | France | |||
| EO | ALX | Hewa Bora Airways | ALLCONGO | Democratic Republic of the Congo | |
| AHT | HTA Helicopteros | HELIAPRA | Portugal | ||
| ETI | H-Bird Aviation Services AB | JETHAWK | Sweden | ||
| HSN | H.S.AVIATION CO., LTD. | H.S.AVIATION | Thailand | ||
| HAY | Hamburg Airways | HAMBURG AIRWAYS | Germany | defunct | |
| HCK | Heli-Charter | HELI-CHARTER | United Kingdom | ||
| HTB | Helix-Craft Aviation | HELIX-CRAFT | Panama | 2014 [28] | |
| HAF | Hellenic Air Force | HELLENIC AIR FORCE | Greece | ||
| HRN | Heron Luftfahrt | HERONAIR | Germany | ||
| HYP | Hyperion Aviation | HYPERION | Malta | ||
| HFM | Hi Fly Malta | MOONRAKER | Malta | ||
| A5 | HOP | Hop! | AIR HOP | France | |
| HLA | HC Airlines | HEAVYLIFT | United Kingdom | ||
| HWD | HPM Investments | FLITEWISE | United Kingdom | ||
| KTR | HT Helikoptertransport | COPTER TRANS | Sweden | ||
| Hacienda Airlines | United States | defunct - 1957 to July 10, 1962 | |||
| FMS | Hadison Aviation | HADI | United States | ||
| H6 | HAG | Hageland Aviation Services | HAGELAND | United States | |
| POW | Hagondale Limited | AIRNET | United Kingdom | ||
| HR | HHN | Hahn Air | ROOSTER | Germany | |
| H1 | Hahn Air Systems | Germany | |||
| HU | CHH | Hainan Airlines | HAINAN | China | |
| 1R | Hainan Phoenix Information Systems | China | |||
| HLS | Haiti Air Freight | Haiti | |||
| 2T | HAM | Haiti Ambassador Airlines | Haiti | ||
| HTI | Haiti International Air | HAITI INTERNATIONAL | Haiti | ||
| HRB | Haiti International Airline | HAITI AIRLINE | Haiti | ||
| HNR | Haiti National Airlines (HANA) | HANAIR | Haiti | ||
| HTN | Haiti North Airline | Haiti | |||
| HTC | Haiti Trans Air | HAITI TRANSAIR | Haiti | ||
| HBC | Haitian Aviation Line | HALISA | Haiti | ||
| HAJ | Hajvairy Airlines | HAJVAIRY | Pakistan | ||
| HKL | Hak Air | HAK AIRLINE | Nigeria | ||
| HLH | Hala Air | HALA AIR | Sudan | ||
| HCV | Halcyonair | CREOLE | Cape Verde | ||
| 4R | HHI | Hamburg International | HAMBURG JET | Germany | |
| HJL | Hamlin Jet | BIZJET | United Kingdom | ||
| HMM | Hamra Air | HAMRA | United Arab Emirates | ||
| WVA | Hand D Aviation | WABASH VALLEY | United States | ||
| HGR | Hangar 8 | HANG | United Kingdom | ||
| HGD | Hangard Aviation | HANGARD | Mongolia | ||
| HAN | Hansung Airlines | HANSUNG AIR | Republic of Korea | ||
| X3 | HLX | Hapag-Lloyd Express | YELLOW CAB | Germany | Became TUI fly Deutschland in 2007 |
| HF | HLF | Hapagfly | HAPAG LLOYD | Germany | Became TUI fly Deutschland in 2007 |
| HB | HAR | Harbor Airlines | HARBOR | United States | |
| HQ | HMY | Harmony Airways | HARMONY | Canada | |
| NBR | Haughey Air | NORBROOK | United Kingdom | ||
| PYN | Haverfordwest Air Charter Services | POYSTON | United Kingdom | ||
| HAV | Havilah Air Services | HAVILAH | Nigeria | ||
| HA | HAL | Hawaiian Airlines | HAWAIIAN | United States | |
| HP | Hawaiian Pacific Airlines | United States | defunct | ||
| HKR | Hawk Air | AIR HAW | Argentina | ||
| HMX | Hawk De Mexico | HAWK MEXICO | Mexico | ||
| BH | Hawkair | Canada | defunct since 2016 | ||
| HKI | Hawkaire | HAWKEYE | United States | ||
| HZL | Hazelton Airlines | HAZELTON | Australia | Defunct. | |
| HN | HVY | Heavylift Cargo Airlines | HEAVY CARGO | Australia | |
| HVL | Heavylift International | HEAVYLIFT INTERNATIONAL | United Arab Emirates | ||
| NS | HBH | Hebei Airlines | HEBEI AIR | China | |
| HDC | Helcopteros De Cataluna | HELICATALUNA | Spain | ||
| HCB | Helenair (Barbados) | HELEN | Barbados | ||
| HCL | Helenair Corporation | HELENCORP | Saint Lucia | ||
| HHP | Helenia Helicopter Service | HELENIA | Denmark | ||
| HLR | Heli Air Services | HELI BULGARIA | Bulgaria | ||
| ALJ | Heli Ambulance Team | ALPIN HELI | Austria | ||
| HEB | Heli Bernina | HELIBERNINA | Switzerland | ||
| HFR | Heli France | HELIFRANCE | France | ||
| HYH | Heli Hungary | HELIHUNGARY | Hungary | ||
| HLM | Heli Medwest De Mexico | HELIMIDWEST | Mexico | ||
| HLI | Heli Securite | HELI SAINT-TROPEZ | France | ||
| HTP | Heli Trip | HELI TRIP | Mexico | ||
| HLU | Heli Union Heli Prestations | HELI UNION | France | ||
| MCM | Heli-Air-Monaco | HELI AIR | Monaco | ||
| HHE | Heli-Holland | HELI HOLLAND | Netherlands | ||
| HRA | Heli-Iberica | ERICA | Spain | ||
| HIF | Heli-Iberica Fotogrametria | HIFSA | Spain | ||
| HIG | Heli-Inter Guyane | INTER GUYANNE | France | ||
| HLK | Heli-Link | HELI-LINK | Switzerland | ||
| HMC | Heliamerica De Mexico | HELIAMERICA | Mexico | ||
| HEA | Heliavia-Transporte Aéreo | HELIAVIA | Portugal | ||
| CDY | Heliaviation Limited | CADDY | United Kingdom | ||
| HIB | Helibravo Aviacao | HELIBRAVO | Portugal | ||
| HLC | Helicap | HELICAP | France | ||
| COV | Helicentre Coventry | HELICENTRE | United Kingdom | ||
| HEL | Helicol | HELICOL | Colombia | ||
| HCP | Helicopter | HELI CZECH | Czech Republic | ||
| JKY | Helicopter & Aviation Services | JOCKEY | United Kingdom | ||
| MVK | Helicopter Training & Hire | MAVRIK | United Kingdom | ||
| HAP | Helicopteros Aero Personal | HELIPERSONAL | Mexico | ||
| HAA | Helicopteros Agroforestal | AGROFORESTAL | Chile | ||
| HNT | Helicopteros Internacionales | HELICOP INTER | Mexico | ||
| HEN | Helicópteros Y Vehículos Nacionales Aéreos | HELINAC | Mexico | ||
| HHH | Helicsa | HELICSA | Spain | ||
| JB | JBA | Helijet | HELIJET | Canada | |
| HDR | Helikopterdrift | HELIDRIFT | Norway | ||
| SCO | Helikopterservice Euro Air | SWEDCOPTER | Sweden | ||
| OCE | Heliocean | HELIOCEAN | France | ||
| ZU | HCY | Helios Airways | HELIOS | Cyprus | defunct since 7 November 2006 |
| HLP | Helipistas | HELIPISTAS | Spain | ||
| HPL | Heliportugal | HELIPORTUGAL | Portugal | ||
| HEC | Heliservicio Campeche | HELICAMPECHE | Mexico | ||
| HSU | Helisul | HELIS | Portugal | ||
| HSI | Heliswiss | HELISWISS | Switzerland | ||
| HLT | Helitafe | HELITAFE | Mexico | ||
| HIT | Helitalia | HELITALIA | Italy | ||
| OFA | Helitaxi Ofavi | OFAVI | Mexico | ||
| HLT | Helitours | HELITOURS | Sri Lanka | ||
| 9I | HTA | Helitrans | SCANBIRD | Norway | |
| HTS | Helitrans Air Service | HELITRANS | United States | ||
| HLW | Heliworks | HELIWORKS | Chile | ||
| HJ | HEJ | Hellas Jet | HELLAS JET | Greece | ceased operation in 2010 |
| HW | FHE | Hello | FLYHELLO | Switzerland | |
| HLG | Helog | HELOG | Switzerland | ||
| 2L | OAW | Helvetic Airways | HELVETIC | Switzerland | |
| HMS | Hemus Air | HEMUS AIR | Bulgaria | ||
| HAC | Henebury Aviation | Australia | |||
| SSH | Heritage Flight (Valley Air Services) | SNOWSHOE | United States | ||
| MRX | Herman's Markair Express | SPEEDMARK | United States | ||
| HED | Heritage Aviation Developments | FLAPJACK | United Kingdom | ||
| UD | HER | Hex'Air | HEX AIRLINE | France | |
| HHS | Hi-Jet Helicopter Services | HIJET | Suriname | ||
| 5K | HFY | Hi Fly | SKY FLYER | Portugal | |
| HLB | High-Line Airways | HIGH-LINE | Canada | ||
| HWY | Highland Airways | HIWAY | United Kingdom | ||
| H9 | HIM | Himalaya Airlines | HIMALAYA | Nepal | |
| H7 | HYM | HiSky | SKY MOLDOVA | Moldova | |
| H4 | HYS | HiSky Europe | SKY EUROPE | Romania | |
| HSH | Hispánica de Aviación | HASA | Spain | ||
| HIS | Hispaniola Airways | HISPANIOLA | Dominican Republic | ||
| VM | VMS | His Majesty King Maha Vajiralongkorn | VICTOR MIKE [29] | Thailand | holding airline, renamed on his accession.[ citation needed ] |
| HGA | Hogan Air | HOGAN AIR | United States | ||
| NTH | Hokkaido Air System | NORTH AIR | Japan | ||
| ABH | Hokuriki-Koukuu Company | Japan | |||
| H5 | HOA | Hola Airlines | HOLA | Spain | |
| HIN | Holding International Group | HOLDING GROUP | Mexico | ||
| HOL | Holiday Airlines (US Airline) | HOLIDAY | United States | ||
| HC | HCC | Holidays Czech Airlines | CZECH HOLIDAYS | Czech Republic | |
| HTR | Holstenair Lubeck | HOLSTEN | Germany | ||
| HMV | Homac Aviation | HOMAC | Luxembourg | ||
| HAS | Honduras Airlines | HONDURAS AIR | Honduras | ||
| HX | CRK | Hong Kong Airlines | BAUHINIA | Hong Kong | |
| RH | HKC | Hong Kong Air Cargo | MASCOT | Hong Kong | |
| UO | HKE | Hong Kong Express Airways | HONGKONG SHUTTLE | Hong Kong | |
| A6 | HTU | Hongtu Airlines | HONGLAND | China | |
| HEX | Honiara Cargo Express | HONIARA CARGO | Solomon Islands | ||
| H1 | Hooters Air | Hooters Air | United States | The airline was established in 2003 and started operations on March 6, 2003. On April 17, 2006, Hooters Air ceased operations, halting scheduled Public Charter service and refunding tickets. | |
| HPJ | Hop-A-Jet | HOPA-JET | United States | ||
| HH | Hope Air | HOPE AIR | Canada | ||
| QX | QXE | Horizon Air | HORIZON AIR | United States | |
| KOK | Horizon Air Service | KOKO | United States | ||
| HSM | Horizon Air for Transport and Training | ALOFUKAIR | Libya | ||
| HOR | Horizon Air-Taxi | HORIZON | Switzerland | ||
| BN | HZA | Horizon Airlines | HORIZON | Australia | defunct |
| HPS | Horizon Plus | HORIZON PLUS | Bangladesh | ||
| HUD | Horizons Unlimited | HUD | United States | ||
| HOZ | Horizontes Aéreos | HORIZONTES AEREOS | Mexico | ||
| HDI | Hoteles Dinamicos | DINAMICOS | Mexico | ||
| HHO | Houston Helicopters | HOUSTON HELI | United States | ||
| GGV | Houston Jet Services | GREGG AIR | Austria | ||
| OZU | Hozu-Avia | HOZAVIA | Kazakhstan | ||
| HUB | Hub Airlines | HUB | United States | ||
| HUS | Huessler Air Service | HUESSLER | United States | ||
| GMH | Hughes Aircraft Company | HUGHES EXPRESS | United States | ||
| HJ | USW | HumoAir | AKSAR | Uzbekistan | |
| HUV | Hunair Hungarian Airlines | SILVER EAGLE | Hungary | ||
| HUF | Hungarian Air Force | HUNGARIAN AIRFORCE | Hungary | ||
| HW | UBD | FlyErbil | HAWLER | Iraqi Kurdistan | |
| HYA | Hyack Air | HYACK | Canada | ||
| HYC | Hydro Air Flight Operations | HYDRO CARGO | South Africa | ||
| HYD | Hydro-Québec | HYDRO | Canada | ||
| HKB | Hawker Beechcraft | CLASSIC | United States | ||
| MR | MML | Hunnu Air | TRANS MONGOLIA | Mongolia | |
| RPX | HD Air Ltd | RAPEX | United Kingdom | ||
| SRD | HM Coastguard | COASTGUARD | United Kingdom | ||
| SRG | HM Coastguard | RESCUE | United Kingdom | Search and Rescue | |
| WHR | Hummingbird Helicopter Service | WHIRLEYBIRD | United States | ||
| I4 | EXP | Island Air Express | ISLAND EXPRESS | United States | 2014 [30] |
| IWL | Island Wings | Bahamas | 2014 [30] | ||
| IK | KAR | Ikar | IKAR | Russian Federation | |
| ICN | Iconair | Pakistan | |||
| IAC | INTERCHARTER | Romania | |||
| ITC | International Air Carrier Association | Belgium | |||
| IDG | IDG Technology Air | INDIGO | Czech Republic | ||
| IFL | IFL Group | EIFEL | United States | ||
| RDE | II Lione Alato Arl | FLIGHT RED | United Kingdom | ||
| IJM | IJM International Jet Management | JET MANAGEMENT | Austria | ||
| IKK | IKI International Airlines | IKIAIR | Japan | ||
| IKN | IKON FTO | IKON | Germany | ||
| BLU | IMP Aviation Services | BLUENOSE | Canada | ||
| XGG | IMP Group Aviation Services | Canada | |||
| 1F | INFINI Travel Information | Japan | Computer Reservation System | ||
| IPA | IPEC Aviation | IPEC | Australia | ||
| IPM | IPM Europe | SHIPEX | United Kingdom | ||
| LVB | IRS Airlines | SILVERBIRD | Nigeria | ||
| ISD | ISD Avia | ISDAVIA | Ukraine | ||
| 1U | ITA Software | United States | Computer reservation system | ||
| FDF | IVV Femida | Russia | |||
| IB | IBE | Iberia Airlines | IBERIA | Spain | |
| II | CSQ | IBC Airways | CHASQUI | United States | |
| I2 | IBS | Iberia Express | IBEREXPRESS | Spain | Charter service, low cost carrier for EU flights of Iberia operating only A320s |
| IBR | Ibertour Servicios Aéreos | IBERTOUR | Spain | ||
| IBT | Ibertrans Aérea | IBERTRANS | Spain | ||
| TY | IWD | Iberworld | IBERWORLD | Spain | |
| FW | IBX | Ibex Airlines | IBEX | Japan | |
| IBC | Ibicenca Air | IBICENCA | Spain | ||
| AKI | Ibk-Petra | Sudan | |||
| 0C | IBL | IBL Aviation | CATOVAIR | Mauritius | |
| BBL | IBM Euroflight Operations | BLUE | Switzerland | ||
| YYY | ICAO | Used by airlines without a specific code | |||
| C3 | IPR | Independent Carrier (ICAR) | ICAR | Ukraine | |
| ICA | Icaro | ICARFLY | Italy | ||
| ICD | Icaro Air | ICARO | Ecuador | Defunct 2011 | |
| IUS | Icarus | ICARUS | Italy | ||
| CIC | ICC Canada | AIR TRADER | Canada | ||
| ICJ | Icejet | ICEJET | Iceland | ||
| HC | Iceland Express | Iceland | defunct | ||
| FI | ICE | Icelandair | ICEAIR | Iceland | |
| ICG | Icelandic Coast Guard | ICELAND COAST | Iceland | ||
| RAC | Icar Air | TUZLA AIR | Bosnia and Herzegovina | ||
| FRC | Icare Franche Compte | FRANCHE COMPTE | France | ||
| IFM | Ifly | ICOPTER | Greece | ||
| IKR | Ikaros DK | IKAROS | Denmark | ||
| CIO | Il Ciocco International Travel Service | CIOCCO | Italy | ||
| ILV | Il-Avia | ILAVIA | Russia | ||
| IDL | Ildefonso Redriguez | ILDEFONSO | Mexico | ||
| V8 | IAR | Iliamna Air Taxi | ILIAMNA AIR | United States | |
| ILP | Ilpo Aruba Cargo | Aruba | |||
| ILL | Ilyich-Avia | ILYICHAVIA | Ukraine | ||
| IMR | Imaer | IMAER | Portugal | ||
| ITX | Imair Airlines | IMPROTEX | Azerbaijan | ||
| PNX | Imperial Airways | PHOENIX | United States | ICAO code in use by another company, call sign no longer allocated | |
| IMG | Imperial Cargo Airlines | IMPERIAL AIRLINES | Ghana | ||
| IMT | Imtrec Aviation | IMTREC | Cambodia | ||
| DH | IDE | Independence Air | INDEPENDENCE AIR | United States | defunct |
| IDP | Independent Air Freighters | INDEPENDENT | Australia | ||
| I7 | IOA | IndiaOne Air | INDIA FIRST | India | |
| 6E | IGO | IndiGo | IFLY | India | InterGlobe Aviation |
| IIL | India International Airways | INDIA INTER | India | ||
| IFC | Indian Air Force | INDIAN AIRFORCE | India | ||
| IC | IAC | Indian Airlines | INDAIR | India | |
| IDR | Indicator Company | INDICATOR | Hungary | ||
| I9 | IBU | Indigo Airlines | INDIGO BLUE | United States | |
| VP | AXC | Indochina Airlines | AIRSPUP | Vietnam | defunct |
| IDA | Indonesia Air Transport | INTRA | Indonesia | ||
| QZ | AWQ | Indonesia AirAsia | WAGON AIR | Indonesia | |
| IO | IAA | Indonesian Airlines | INDO LINES | Indonesia | |
| IPN | Industri Pesawat Terbang Nusantara | NUSANTARA | Indonesia | ||
| ITN | Industrias Titan | TITANLUX | Spain | ||
| FFI | Infinit Air | INFINIT | Spain | ||
| INS | Inflite The Jet Centre | United Kingdom | |||
| IVA | Innotech Aviation | INNOTECH | Canada | ||
| INC | Insel Air International | INSELAIR | Netherlands Antilles | ||
| ICC | Institut Cartogràfic de Catalunya | CARTO | Spain | ||
| INT | Intair | INTAIRCO | Canada | ||
| INL | Intal Avia | INTAL AVIA | Kyrgyzstan | ||
| FFL | Intavia Limited | United Kingdom | |||
| XRA | Intensive Air | INTENSIVE | South Africa | ||
| ITW | Inter Air | INTER WINGS | Bulgaria | ||
| INX | Inter Express | INTER-EURO | Turkey | ||
| IIC | Inter Island Air Charter | Bahamas | 2014 [30] | ||
| H4 | IIN | Inter Island Airways | Cape Verde | ||
| CAR | Inter RCA | QUEBEC ROMEO | Central African Republic | ||
| NTT | Inter Tropic Airlines | INTER-TROPIC | Sierra Leone | ||
| TCU | Inter Tropical Aviation | TROPAIR | Suriname | Defunct 2001 | |
| ITA | Inter-Air | CAFEX | United States | ||
| ICN | Inter-Canadian | INTER-CANADIAN | Canada | ||
| UGL | Inter-Island Air | UGLY VAN | United States | ||
| IMA | Inter-Mountain Airways | INTER-MOUNTAIN | United States | ||
| ITS | Inter-State Aviation | INTER-STATE | United States | ||
| D6 | ILN | Interair South Africa | INLINE | South Africa | |
| NTE | Interaire | INTERMEX | Mexico | ||
| ZA | SUW | Interavia Airlines | ASTAIR | Russia | |
| IVT | Interaviatrans | INTERAVIA | Ukraine | ||
| JY | IWY | InterCaribbean Airways | ISLANDWAYS | Turks and Caicos Islands | Name changed from Interisland Airways Limited and Air Turks & Caicos |
| RS | ICT | Intercontinental de Aviación | CONTAVIA | Colombia | |
| ICP | Intercopters | CHOPER | Spain | ||
| IFT | Interflight | INTERFLIGHT | United Kingdom | ||
| IJT | Interflight (Learjet) | United Kingdom | |||
| RFL | Interfly | INFLY | Italy | ||
| IFF | Interfreight Forwarding | INTERFREIGHT | Sudan | ||
| IGN | Interguide Air | DIVINE AIR | Nigeria | ||
| ISN | Interisland Airlines | TRI-BIRD | Philippines | ||
| IWY | Interisland Airways Limited | ISLANDWAYS | Turks and Caicos Islands | Name changed to Air Turks and Caicos | |
| 4O | AIJ | Interjet | ABC AEROLINEAS | Mexico | |
| IHE | Interjet Helicopters | INTERCOPTER | Greece | ||
| IJW | Interjet Inc. | JET WEST | United States | 2015 [31] | |
| ID | ITK | Interlink Airlines | INTERLINK | South Africa | |
| IAK | International Air Cargo Corporation | AIR CARGO EGYPT | Egypt | ||
| EXX | International Air Corporation | EXPRESS INTERNATIONAL | United States | ||
N/A | NCC | T3 Aviation, Inc. | STARFLEET | United States | 2020 [32] |
| IAX | International Air Services | INTERAIR SERVICES | Liberia | ||
| IBY | International Business Aircraft | CENTRAL STAGE | United States | ||
| ICS | International Charter Services | INTERSERVI | Mexico | ||
| ICX | International Charter Xpress | INTEX | United States | Defunct 1994 | |
| RED | International Committee of the Red Cross | RED CROSS | Switzerland | ||
| IIG | International Company for Transport, Trade and Public Works | ALDAWLYH AIR | Libya | ||
| IFX | International Flight Training Academy | IFTA | United States | ||
| IJA | International Jet Aviation Services | I-JET | United States | ||
| HSP | International Jet Charter | HOSPITAL | United States | The Flying Hospital | |
| THN | International Security Assistance Force | ATHENA | Canada | ||
| RSQ | International SOS Windhoek | SKYMEDIC | Namibia | ||
| ISF | International Stabilisation Assistance Force | United Kingdom | |||
| ITH | International Trans-Air | INTRANS NIGERIA | Nigeria | ||
| IPT | Interport Corporation | INTERPORT | United States | ||
| IKY | Intersky Bulgary | GENERAL SKY | Bulgaria | ||
| 3L | ISK | Intersky | INTERSKY | Austria | Defunct |
| I4 | FWA | Interstate Airlines | FREEWAYAIR | Netherlands | Defunct |
| ITU | Intervuelos | INTERLOS | Mexico | ||
| INV | Inversija | INVER | Latvia | ||
| IND | Iona National Airways | IONA | Ireland | ||
| IOA | Iowa Airways | IOWA AIR | United States | ||
| IR | IRA | Iran Air | IRANAIR | Iran | |
| EP | IRC | Iran Aseman Airlines | ASEMAN | Iran | |
| B9 | IRB | Iran Airtour | AIRTOUR | Iran | |
| IRG | Iranian Naft Airlines | NAFT | Iran | ||
| IA | IAW | Iraqi Airways | IRAQI | Iraq | |
| BIS | Irbis Air | IRBIS | Kazakhstan | ||
| IRL | Irish Air Corps | IRISH | Ireland | ||
| RDK | Irish Air Transport | IRISH TRANS | Ireland | ||
| XMR | Irish Aviation Authority | AUTHORITY | Ireland | ||
| IH | MZA | Irtysh Air | IRTYSH AIRLINES | Kazakhstan | Old IATA code: IT; old ICAO code: IRT |
| KCE | Irving Oil | KACEY | Canada | ||
| ISI | Island Air | ISLANDMEX | Mexico | ||
| ILF | Island Air Charters | ISLAND FLIGHT | United States | ||
| XYZ | Island Air Express | RAINBIRD | United States | ||
| ISA | Island Airlines | United States | |||
| SOY | Island Aviation | SORIANO | Philippines | ||
| DQA | Island Aviation Services | Maldives | |||
| IOM | Island Aviation and Travel | ISLE AVIA | United Kingdom | ||
| 2S | SDY | Island Express | SANDY ISLE | United States | |
| MTP | Island Helicopters | METROCOPTER | United States | ||
| ILC | ILAS Air | Japan | |||
| IAJ | Islandair Jersey | JARLAND | United Kingdom | ||
| CN | Islands Nationair | Papua New Guinea | |||
| ICB | Icebird Airline | ICEBIRD | Iceland | ||
| IF | ISW | Islas Airways | PINTADERA | Spain | |
| IGS | Isle Grande Flying School | ISLA GRANDE | United States | ||
| WC | ISV | Islena De Inversiones | Honduras | ||
| IOS | Isles of Scilly Skybus | SCILLONIA | United Kingdom | ||
| IAI | Israel Aircraft Industries | ISRAEL AIRCRAFT | Israel | ||
| IAF | Israeli Air Force | Israel | |||
| 6H | ISR | Israir | ISRAIR | Israel | |
| IST | Istanbul Airlines | ISTANBUL | Turkey | ||
| AZ | ITY | ITA Airways | ITARROW | Italy | |
| FS | ACL | Itali Airlines | SPADA | Italy | Former name: Transporti Aerei Italiani; former IATA Code: 9X*; former ICAO code: ACO |
| IAM | Italian Air Force | ITALIAN AIRFORCE | Italy | ||
| IEI | Italian Army | ITALIAN ARMY | Italy | ||
| GCI | Italian Coast Guard | ITALIAN COAST GUARD | Italy | ||
| MMI | Italian Navy | ITALIAN NAVY | Italy | ||
| IFS | Italy First | RIVIERA | Italy | ||
| GI | IKA | Itek Air | ITEK-AIR | Kyrgyzstan | ?ICAO confirmed; IATA not |
| IVS | Ivoire Aero Services | IVOIRE AERO | Ivory Coast | ||
| IVW | Ivoire Airways | IVOIRAIRWAYS | Ivory Coast | ||
| IJE | Ivoire Jet Express | IVOIRE JET | Ivory Coast | ||
| OIC | Iwamoto Crane Co Ltd | Japan | |||
| IXR | Ixair | X-BIRD | France | ||
| H9 | IZM | Izair | IZMIR | Turkey | |
| IZA | Izhavia | IZHAVIA | Russia | ||
| JTN | JET TEST | United States | |||
| JGJ | Jinggong Jet | GLOBAL JINGGONG | China | 2014, [33] 2023 [34] | |
| JNY | Journey Aviation | ROCKBAND | United States | 2023: Callsign "ROCKBAND"; [34] Former Call Sign/Telephony Designator: UNIJET-ROCKBAND (2014 [33] ) | |
| JKR | Justice Air Charter | JOKER | United States | Trading name for Reliant Aviation, allocated in 2014 [35] | |
| JWD | Jayawijaya Dirgantara | Indonesia | |||
| JCB | JCB (heavy equipment manufacturer) | JAYSEEBEE | United Kingdom | ||
| RFX | J P Hunt Air Carriers | REFLEX | United States | J P Hunt Air Carriers | |
| XM | J-Air | J AIR | Japan | ||
| JC | JEX | JAL Express | JANEX | Japan | |
| JO | JAZ | JALways | JALWAYS | Japan | |
| JDA | JDAviation | JAY DEE | United Kingdom | ||
| JDP | JDP Lux | RED PELICAN | Luxembourg | ||
| JHM | JHM Cargo Expreso | Costa Rica | |||
| TQM | JM Family Aviation | TACOMA | United States | ||
| MT | JMC | JMC Airlines | JAYEMMSEE | United Kingdom | |
| 1M | JSC Transport Automated Information Systems | Russia | |||
| JSJ | JS Air | JS CHARTER | Pakistan | ||
| JES | JS Aviation | JAY-ESS AVIATION | Mexico | ||
| JCK | Jackson Air Services | JACKSON | Canada | ||
| JI | JAE | Jade Cargo International | JADE CARGO | China | defunct |
| JAW | Jamahiriya Airways | JAW | Libya | ||
| JMB | Jambo Africa Airlines | JAMBOAFRICA | Democratic Republic of Congo | ||
| WWW | Janet | JANET | United States | de facto name | |
| FJX | Jet Sky Cargo and Air Charter | Kenya | |||
| JAK | Jana-Arka | YANZAR | Kazakhstan | ||
| JAX | Janair | JANAIR | United States | ||
| 3X | JAC | Japan Air Commuter | COMMUTER | Japan | |
| JSV | Japan Aircraft Service | Japan | |||
| JL | JAL | Japan Airlines | JAPANAIR | Japan | Japan Airlines International |
| JL | JAL | Japan Airlines Domestic | J-BIRD | Japan | defunct |
| EG | JAA | Japan Asia Airways | ASIA | Japan | defunct |
| NU | JTA | Japan Transocean Air | JAI OCEAN | Japan | |
| JA | JAT | JetSMART | ROCKSMART | Chile | |
| JZ | JAP | JetSMART Perú | RED SMART | Peru | |
| WJ | JES | JetSMART Argentina | SMARTBIRD | Argentina | |
| JU | JAT | Jat Airways | JAT | Serbia | |
| VJ | JTY | Jatayu Airlines | JATAYU | Indonesia | |
| J9 | JZR | Jazeera Airways | JAZEERA | Kuwait | |
| 7C | JJA | Jeju Air | JEJU AIR | Republic of Korea | |
| JNY | Jenney Beechcraft | JENAIR | United States | ||
| XLD | Jeppesen Data Plan | United States | |||
| JPN | Jeppesen UK | JETPLAN | United Kingdom | ||
| O2 | JEA | OLT Express | JETA | Poland | defunct, funded by acquisition of Jet Air and YES Airways |
| JSI | Jet Air Group | SISTEMA | Russia | JSC | |
| 9W | JAI | Jet Airways | JET AIRWAYS | India | |
| QJ | Jet Airways | United States | |||
| JTX | Jet Aspen Air Lines | JET ASPEN | United States | ||
| PP | PJS | Jet Aviation | JETAVIATION | Switzerland | |
| BZF | Jet Aviation Business Jets | BIZFLEET | United States | ||
| JAS | Jet Aviation Flight Services | JET SETTER | United States | ||
| JCF | Jet Center Flight Training | JET CENTER | Spain | ||
| JCT | Jet Charter | JET CHARTER | United States | ||
| JCX | Jet Connection | JET CONNECT | Germany | defunct | |
| DWW | Jet Courier Service | DON JUAN | United States | ||
| JED | Jet East International | JET EAST | United States | defunct | |
| JEI | Jet Executive International Charter | JET EXECUTIVE | Germany | ||
| RZA | Jet Fighter Flights | RAZOR | Australia | ||
| CFT | Jet Freighters | CASPER FREIGHT | United States | ||
| JGD | Jet G&D Aviation | JET GEE-AND-DEE | Israel | ||
| MJL | Jet Line International | MOLDJET | Moldova | ||
| JEK | Jet Link | JET OPS | Israel | ||
| HTL | Jet Linx Aviation | HEARTLAND | United States | ||
| JTL | Jet Linx Aviation | JET LINX | United States | ||
| JNR | Jet Norte | JET NORTE | Mexico | ||
| JRN | Jet Rent | JET RENT | Mexico | ||
| JDI | Jet Story | JEDI | Poland | Formerly: Jet Service | |
| 3K | JSA | Jetstar Asia Airways | JETSTAR ASIA | Singapore | |
| JDI | Jet Story | JEDI | Poland | former Blue Jet | |
| JSM | Jet Stream | JET STREAM | Moldova | ||
| VTB | Jet Stream Charter KFT. | SUXAIR | Hungary | 2023 [34] | |
| JSS | Jet Stream International | Pakistan | 2023 [34] | ||
| JTF | Jet Time | JETFIN | Finland | 2014, [33] 2023 [34] | |
| JTC | Jet Trans Aviation | JETRANS | Ghana | ||
| JTT | Jet-2000 | MOSCOW JET | Russia | ||
| OPS | Jet-Ops | OPS-JET | United Arab Emirates | ||
| JSH | Jet-stream | STREAM AIR | Hungary | ||
| LS | EXS | Jet2.com | CHANNEX | United Kingdom | Formerly Channel Express |
| JFU | Jet4You | ARGAN | Morocco | ||
| OSW | JetAfrica Eswatini | BEVO | Eswatini | ||
| B6 | JBU | JetBlue Airways | JETBLUE | United States | |
| JMG | JetMagic | JET MAGIC | Ireland | Defunct | |
| JMK | Jetmagic | Malta | Defunct, Not Many Flights | ||
| JF | JAA | Jet Asia Airways | JET ASIA | Thailand | |
| JAF | Jetairfly | BEAUTY | Belgium | ||
| JTL | Jetall Holdings | FIREFLY | Canada | ||
| JAG | Jetalliance | JETALLIANCE | Austria | ||
| 0J | JCS | Jetclub | JETCLUB | Switzerland | |
| QNZ | Jetconnect | QANTAS JETCONNECT | New Zealand | ||
| UEJ | Jetcorp | JETCORP | United States | (United Executive Jet) | |
| JCC | Jetcraft Aviation | JETCRAFT | Australia | ||
| JXA | Jetex Aviation | Lebanon | |||
| JEF | Jetflite | JETFLITE | Finland | ||
| JFL | Jetfly Airlines | LINEFLYER | Austria | ||
| JFA | Jetfly Aviation | MOSQUITO | Luxembourg | ||
| JIC | Jetgo International | JIC-JET | Thailand | ||
| JLX | Jetlink Express | KEN JET | Kenya | ||
| JLH | Jetlink Holland | Netherlands | Defunct, ICAO code in use by another company | ||
| JNL | JetNetherlands | JETNETHERLANDS | Netherlands | ||
| JNV | Jetnova de Aviación Ejecutiva | JETNOVA | Spain | ||
| JPO | Jetpro | JETPRO | Mexico | ||
| MDJ | Jetran Air | JETRAN AIR | Romania | ||
| JRI | Jetrider International | JETRIDER | United Kingdom | ||
| JEJ | Jets Ejecutivos | MEXJETS | Mexico | ||
| JEP | Jets Personales | JET PERSONALES | Spain | ||
| JSE | Jets Y Servicios Ejecutivos | SERVIJETS | Mexico | ||
| SG | JGO | JetsGo | JETSGO | Canada | defunct |
| JQ | JST | Jetstar | JETSTAR | Australia | |
| GK | JJP | Jetstar Japan | ORANGE LINER | Japan | |
| JM | JKT | Jetstar Hong Kong Airways | KAITAK | China | |
| JXT | Jetstream Executive Travel | VANNIN | United Kingdom | ||
| RSP | JetSuite | REDSTRIPE | United States | ||
| JPQ | Jett Paqueteria | JETT PAQUETERIA | Mexico | ||
| JX | JEC | Jett8 Airlines Cargo | TAIPAN | Singapore | defunct |
| JO | JTD | Jettime | JETTIME | Denmark | |
| JTN | Jet Test Intl. | JET TEST | United States | ||
| JWY | Jetways of Iowa | JETWAYS | United States | ||
| GX | JXX | JetX Airlines | JETBIRD | Iceland | |
| JIB | Jibair | JIBAIRLINE | Djibouti | ||
| JSW | Jigsaw Project | JIGSAW | United Kingdom | Bristow Helicopters | |
| HKN | Jim Hankins Air Service | HANKINS | United States | ||
| RAS | Jim Ratliff Air Service | SHANHIL | United States | ||
| LJ | JNA | Jin Air | JIN AIR | South Korea | |
| JDG | Joanas Avialinijos | LADYBLUE | Lithuania | ||
| JBR | Job Air | JOBAIR | Czech Republic | ||
| JHN | Johnson Air | AIR JOHNSON | United States | ||
| JON | Johnsons Air | JOHNSONSAIR | Ghana | ||
| JMJ | Johnston Airways | JOHNSTON | United States | ||
| JMM | Joint Military Commission | JOICOMAR | Sudan | ||
| JMT | Jomartaxi Aereo | JOMARTAXI | Mexico | ||
| ODI | Jonsson, H Air Taxi | ODINN | Iceland | ||
| R5 | JAV | Jordan Aviation | JORDAN AVIATION | Jordan | |
| J4 | JCI | Jordan International Air Cargo | Jordan | ||
| JVK | Jorvik | ISLANDIC | Iceland | ||
| ENZ | Jota Aviation | ENZO | United Kingdom | ||
| JNJ | Journey Jet | JOURNEY JET | Thailand | ||
| XE | JSX | JSX (airline) | BIGSTRIPE | United States | |
| JUR | Ju-Air | JUNKERS | Switzerland | ||
| JFS | Juanda Flying School | JAEMCO | Indonesia | ||
| JUC | Juba Cargo Services & Aviation Company | JUBA CARGO | Sudan | ||
| 6J | JUB | Jubba Airways | JUBBA | Somalia | |
| DKE | Jubilee Airways | DUKE | United Kingdom | ||
| HO | DKH | Juneyao Airlines | AIR JUNEYAO | China | 2023 [34] |
| JSY | Jung Sky | Croatia | |||
| MEY | Justair Scandinavia | MELODY | Sweden | ||
| DOJ | Justice Prisoner and Alien Transportation System | JUSTICE | United States | ||
| KSA | K S Avia | SKY CAMEL | Latvia | ||
| KCR | Kolob Canyons Air Services | KOLOB | United States | ||
| KW | KHK | Kharkiv Airlines | SUNRAY | Ukraine | |
| KGZ | Kyrgyz Airlines | BERMET | Kyrgyzstan | ||
| KDC | K D Air Corporation | KAY DEE | Canada | ||
| KMI | K-Mile Air | KAY-MILE AIR | Thailand | ||
| KD | KLS | Kalstar Aviation | KALSTAR | Indonesia | |
| KD | KNI | KD Avia | KALININGRAD AIR | Russia | |
| WA | KLC | KLM Cityhopper | CITY | Netherlands | |
| KLH | KLM Helicopter | KLM HELI | Netherlands | ||
| KL | KLM | KLM | KLM | Netherlands | |
| N2 | QNK | Kabo Air | KABO | Nigeria | |
| KMC | Kahama Mining Corporation | KAHAMA | Tanzania | ||
| KI | KAI | KaiserAir | KAISER | United States | Operates B737-500, B737-700, B737-800 |
| K4 | CKS | Kalitta Air | CONNIE | United States | Operates B747-400's, B767-300ER's, B777F |
| K9 | KFS | Kalitta Charters | KALITTA | United States | Operates Lear 25s, 35s, 36s Falcon 20s, CL601 |
| CB* | KII | Kalitta Charters II | DRAGSTER | United States | Operates B727-200's, DC9-15 & 30, B737-400's |
| KES | Kallat El Saker Air Company | KALLAT EL SKER | Libya | ||
| RQ | KMF | Kam Air | KAMGAR | Afghanistan | |
| E2 | KMP | Kampuchea Airlines | KAMPUCHEA | Cambodia | IATA was KT |
| KIZ | Kanaf-Arkia Airlines | Israel | |||
| KHE | Kanfey Ha'emek Aviation | KANFEY HAEMEK | Israel | ||
| KSU | Kansas State University | K-STATE | United States | ||
| V2 | AKT | Karat | AVIAKARAT | Russia | |
| KRB | Karibu Airways Company | KARIBU AIR | Tanzania | ||
| KLG | Karlog Air Charter | KARLOG | Denmark | defunct | |
| KAJ | Karthago Airlines | KARTHAGO | Tunisia | ||
| KAE | Kartika Airlines | KARTIKA | Indonesia | ||
| KTV | Kata Transportation | KATAVIA | Sudan | ||
| KTK | Katekavia | KATEKAVIA | Russia | ||
| KAT | Kato Airline | KATO-AIR | Norway | ||
| KV | MVD | Kavminvodyavia | AIR MINVODY | Russia | |
| XKA | Kavouras Inc | United States | |||
| KRN | Kaz Agros Avia | ANTOL | Kazakhstan | ||
| KAW | Kaz Air West | KAZWEST | Kazakhstan | ||
| KAO | Kazan Aviation Production Association | KAZAVAIA | Russia | ||
| KPH | Kazan Helicopters | KAMA | Russia | ||
| KKA | Kazavia | KAKAIR | Kazakhstan | ||
| KZS | Kazaviaspas | SPAKAZ | Kazakhstan | ||
| 3Q | KCH | KC International Airlines | CAM AIR | Cambodia | |
| JFK | Keenair Charter - | KEENAIR | United Kingdom | ||
| KLX | Kelix Air | KELIX | Nigeria | ||
| FKL | Kelner Airways | KELNER | Canada | ||
| KW | KFA | Kelowna Flightcraft Air Charter | FLIGHTCRAFT | Canada | |
| KDA | Kendell Airlines | KENDELL | Australia | defunct | |
| M5 | KEN | Kenmore Air | KENMORE | United States | |
| KBA | Kenn Borek Air | BOREK AIR | Canada | ||
| KAH | Kent Aviation | DEKAIR | Canada | ||
| KQ | KQA | Kenya Airways | KENYA | Kenya | |
| KVS | Kevis | KEVIS | Kazakhstan | ||
| ZN | KEY | Key Airlines | KEY AIR | United States | |
| KG | LYM | Key Lime Air | KEY LIME | United States | |
| FTP | Keystone Aerial Surveys | FOOTPRINT | United States | ||
| BZ | KEE | Keystone Air Service | KEYSTONE | Canada | |
| K6 | KZW | Khalifa Airways | KHALIFA AIR | Algeria | |
| WKH | Kharkov Aircraft Manufacturing Company | WEST-KHARKOV | Ukraine | ||
| KHR | Khazar | KHAZAR | Turkmenistan | ||
| KHP | Khoezestan Photros Air Lines | PHOTROS AIR | Iran | ||
| KRV | Khoriv-Avia | KHORIV-AVIA | Ukraine | ||
| X9 KO | KHO | Khors Aircompany | AIRCOMPANY KHORS | Ukraine | defunct |
| KHY | Khyber Afghan Airlines | KHYBER | Afghanistan | ||
| UAK | Kiev Aviation Plant | AVIATION PLANT | Ukraine | ||
| KNG | King Aviation | KING | United Kingdom | ||
| BEZ | Kingfisher Air Services | SEA BREEZE | United States | ||
| IT | KFR | Kingfisher Airlines | KINGFISHER | India | Defunct Since 2012 IATA Code transferred to Tigerair Taiwan |
| 4I | KNX | Knighthawk Air Express | KNIGHT FLIGHT | Canada | |
| KAS | Kingston Air Services | KINGSTON AIR | Canada | ||
| KIP | Kinnarps | KINNARPS | Sweden | ||
| KNS | Kinshasa Airways | KINSHASA AIRWAYS | Democratic Republic of the Congo | defunct | |
| KTA | Kirov Air Enterprise | VYATKA-AVIA | Russia | ||
| Y9 | IRK | Kish Air | KISHAIR | Iran | |
| KR | KHA | Kitty Hawk Aircargo | AIR KITTYHAWK | United States | defunct |
| 2K | KHC | Kitty Hawk Airways | CARGO HAWK | United States | defunct |
| KP | KIA | Kiwi International Air Lines | KIWI AIR | United States | |
| KRA | Kiwi Regional Airlines | REGIONAL | New Zealand | ||
| KY | KNA | Kunming Airlines | KUNMING AIR | China | ICAO code KNA was used by Knight Air |
| KHX | Knighthawk Express | RIZZ | United States | ||
| KGT | Knights Airlines | KNIGHT-LINER | Nigeria | ||
| KOA | Koanda Avacion | KOANDA | Spain | ||
| OYE | Koda International | KODA AIR | Nigeria | ||
| 7K | KGL | Kogalymavia Air Company | KOGALYM | Russia | |
| KOM | Kom Activity | COMJET | Netherlands | ||
| KMA | Komiaviatrans State Air Enterprise | KOMI AVIA | Russia | ||
| 8J | KMV | Komiinteravia | KOMIINTER | Russia | |
| KNM | Komsomolsk-on-Amur Air Enterprise | KNAAPO | Russia | ||
| KOB | Koob-Corp - 96 KFT | AUTOFLEX | Hungary | ||
| KE | KAL | Korean Air | KOREANAIR | South Korea | |
| KMG | Kosmas Air | KOSMAS CARGO | Serbia | ||
| KSM | Kosmos | KOSMOS | Russia | ||
| KOS | Kosova Airlines | KOSOVA | Serbia | ||
| WOK | Kovar Air | WOKAIR | Czech Republic | ||
| 7B | KJC | Krasnojarsky Airlines | KRASNOJARSKY AIR | Russia | defunct |
| KFC | Kremenchuk Flight College | KREMENCHUK | Ukraine | ||
| KRG | Krimaviamontag | AVIAMONTAG | Ukraine | ||
| KRO | Kroonk Air Agency | KROONK | Ukraine | ||
| K9 | KRI | Krylo Airlines | Krylo | Russia | |
| KYM | Krym | CRIMEA AIR | Ukraine | ||
| OPC | Krystel Air Charter | OPTIC | United Kingdom | ||
| GW | KIL | Kuban Airlines | AIR KUBAN | Russia | |
| VD | KPA | Kunpeng Airlines | KUNPENG | China | |
| KZA | Kurzemes Avio | Russia | |||
| KBV | Kustbevakningen | SWECOAST | Sweden | ||
| KU | KAC | Kuwait Airways | KUWAITI | Kuwait | |
| GO | KZU | Kuzu Airlines Cargo | KUZU CARGO | Turkey | |
| QVR | Kvadro Aero | PEGASO | Kyrgyzstan | ||
| KWN | Kwena Air | KWENA | South Africa | ||
| N5 | KGZ | Kyrgyz Airlines | BERMET | Kyrgyzstan | |
| KTC | Kyrgyz Trans Avia | DINARA | Kyrgyzstan | ||
| QH | LYN | Kyrgyzstan | ALTYN AVIA | Kyrgyzstan | Name changed to Air Kyrgyzstan |
| R8 | KGA | Kyrgyzstan Airlines | KYRGYZ | Kyrgyzstan | |
| DAM | Kyrgyzstan Department of Aviation | FLIGHT RESCUE | Kyrgyzstan | under the Ministry of Emergency Situation | |
| KGB | Kyrgz General Aviation | KEMIN | Kyrgyzstan | ||
| FK | KEW | Keewatin Air | BLIZZARD | Canada | |
| JS | KOR | Air Koryo | AIR KORYO | North Korea | |
| AOE | Livingstone Executive | LIVINGSTONE AIR | Italy | ||
| LZF | Lease Fly | SKYLEASE | Portugal | ||
| LHB | Liebherr Geschaeftreiseflugzeug | FAMILY | Germany | ||
| LLD | Lloyd Aviation | Venezuela | |||
| LGA | Logistic Air | LOGAIR | Malaysia | ||
| LGC | Legacy Air | LEGACY AIR | Thailand | ||
| JKA | LeTourneau University | JACKET | United States | ||
| LTY | Liberty Air | SKYDECK | Netherlands | ||
| LWL | Lowlevel | CUB DRIVER | Portugal | ||
| LAX | Laminar Air | Spain | |||
| YL | LWA | Libyan Wings | LIBYAN WINGS | Libya | |
| YQ | LCT | TAR Aerolineas | TAR | Mexico | |
| LAH | L A Helicopter | STAR SHIP | United States | ||
| LJY | L J Aviation | ELJAY | United States | ||
| LRB | L R Airlines | LADY RACINE | Czech Republic | ||
| PHO | L&L Flygbildteknik | PHOTOFLIGHT | Sweden | ||
| LEX | L'Express Airlines | LEX | United States | ||
| FNT | L-3 Communications Flight International Aviation | FLIGHT INTERNATIONAL | United States | ||
| JF | LAB | L.A.B. Flying Service | LAB | United States | |
| LR | LRC | LACSA | LACSA | Costa Rica | |
| LDE | LADE - Líneas Aéreas Del Estado | LADE | Argentina | ||
| KG | BNX | LAI - Línea Aérea IAACA | AIR BARINAS | Venezuela | |
| 4M | DSM | LATAM Argentina | LAN AR | Argentina | |
| JJ | TAM | LATAM Brasil | TAM | Brazil | |
| UC | LCO | LATAM Cargo Chile | LAN CARGO | Chile | |
| LA | LAN | LATAM Chile | LAN CHILE | Chile | |
| 4C | ARE | LATAM Colombia | LAN COLOMBIA | Colombia | |
| LNC | LAN Dominicana | LANCANA | Dominican Republic | ||
| LU | LXP | LATAM Express | LANEX | Chile | |
| PZ | LAP | LATAM Paraguay | PARAGUAYA | Paraguay | |
| LP | LPE | LATAM Peru | LANPERU | Peru | |
| NI | LANICA | Nicaragua | |||
| LSA | LANSA | INTERNACIONAL | Dominican Republic | ||
| APT | LAP Colombia - Líneas Aéreas Petroleras, S.A. | LAP | Colombia | ||
| LCB | LC Busre | BUSRE | Peru | ||
| L5 | Línea Aérea Cuencana | Ecuador | |||
| LO | LOT | LOT Polish Airlines | POLLOT | Poland | "POLLOT" is not used in practice. "LOT" is used in almost all cases. |
| JKA | LeTourneau University | JACKET | United States | ||
| XO | LTE | LTE International Airways | FUN JET | Spain | |
| L3 | LTO | LTU Austria | BILLA TRANSPORT | Austria | |
| LT | LTU | LTU International | LTU | Germany | |
| JFC | LTV Jet Fleet Corporation | JET-FLEET | United States | ||
| LUK | LUKoil-Avia | LUKOIL | Russia | ||
| ASK | La Ronge Aviation Services | AIR SASK | Canada | ||
| LVT | La Valenciana Taxi Aéreo | TAXIVALENCIANA | Mexico | ||
| SKQ | Labcorp | SKYLAB | United States | ||
| LAL | Labrador Airways | LAB AIR | Canada | ||
| N6 | JEV | Lagun Air | Spain | ||
| HCA | Lake Havasu Air Service | HAVASU | United States | ||
| LKL | Lakeland Aviation | LAKELAND | United States | ||
| LKR | Laker Airways | LAKER | United States | ||
| LBH | Laker Airways (Bahamas) | LAKER BAHAMAS | United States | ||
| LMR | Lamra | LAMAIR | Sudan | ||
| TCR | Lanaes Aereas Trans Costa Rica | TICOS | Costa Rica | ||
| ISL | Landsflug | ISLANDIA | Iceland | ||
| PAP | Langtry Flying Group | PROFLIGHT | United Kingdom | ||
| IK | LKN | Lankair | Lankair | Sri Lanka | |
| QL | RLN | Lankan Cargo | AERO LANKA | Sri Lanka | |
| LZA | Lanza Air | AEROLANZA | Spain | ||
| LZT | Lanzarote Aerocargo | BARAKA | Spain | ||
| QV | LAO | Lao Airlines | LAO | Lao People's Democratic Republic | |
| LKA | Lao Capricorn Air | NAKLAO | Lao People's Democratic Republic | ||
| LLL | Lao Skyway | LAVIE | Lao People's Democratic Republic | ||
| L7 | LPN | Laoag International Airlines | LAOAG AIR | Philippines | |
| LRD | Laredo Air | LAREDO AIR | United States | ||
| OTN | LASTP | LASTP | São Tomé and Príncipe | ||
| LTC | LatCharter | LATCHARTER | Latvia | defunct | |
| LAF | Latvian Air Force | LATVIAN AIRFORCE | Latvia | ||
| NG | LDA | Lauda Air | LAUDA AIR | Austria | |
| OE [36] | LDM | LaudaMotion | LAUDA MOTION | Austria | |
| LDI | Lauda Air Italy | LAUDA ITALY | Italy | ||
| LEP | Laughlin Express | LAUGHLIN EXPRESS | United States | ||
| LSU | Laus | LAUS AIR | Croatia | ||
| LAR | Lawrence Aviation | LAWRENCE | United States | ||
| LAY | Layang-Layang Aerospace | LAYANG | Malaysia | ||
| LPL | Lease-a-Plane International | LEASE-A-PLANE | United States | ||
| LQ | LAQ | Lebanese Air Transport | LAT | Lebanon | |
| LAT | Lebanese Air Transport (charter) | LEBANESE AIR | Lebanon | ||
| LAD | Lebanon Airport Development Corporation | LADCO-AIR | United States | ||
| LEB | Lebap | LEBAP | Turkmenistan | ||
| LCA | Leconte Airlines | LECONTE | United States | ||
| LI | LIA | Leeward Islands Air Transport | LIAT | Antigua and Barbuda | |
| LGD | Legend Airlines | LEGENDARY | United States | ||
| LWD | Leisure Air | LEISURE WORLD | United States | ||
| LEN | Lentini Aviation | LENTINI | United States | ||
| LOR | Leo-Air | LEO CHARTER | South Africa | ||
| LEL | Leonsa De Aviación | LEONAVIA | Spain | ||
| LL | LVL | Level | LEVEL | Spain | |
| LYW | Libyan Airlines | LIBYAN AIRWAYS | Libya | ||
| LN | LAA | Libyan Arab Airlines | LIBAIR | Libya | |
| LCR | Libyan Arab Air Cargo | LIBAC | Libya | ||
| LIQ | Lid Air | Sweden | |||
| LTA | LIFT Academy | LIFT | United States | ||
| LCG | Lignes Aeriennes Congolaises | CONGOLAISE | Democratic Republic of the Congo | ||
| LKD | Lignes Aeriennes Du Tchad | LATCHAD | Chad | ||
| LME | Lignes Mauritaniennes Air Express | LIMAIR EXPRESS | Mauritania | ||
| GCB | Lignes Nationales Aeriennes - Linacongo | LINACONGO | Republic of the Congo | ||
| GDQ | Lincoln Air National Guard | United States | |||
| LRT | Lincoln Airlines | Australia | |||
| LSY | Lindsay Aviation | LINDSAY AIR | United States | ||
| NOT | Línea Aérea Costa Norte | COSTA NORTE | Chile | ||
| LMC | Línea Aérea Mexicana de Carga | LINEAS DECARGA | Mexico | ||
| L7 | LNP | Línea Aérea SAPSA | SAPSA | Chile | |
| NEG | Línea Aérea de Fumig Aguas Negras | AGUAS NEGRAS | Chile | ||
| QL | LER | Línea Aérea de Servicio Ejecutivo Regional | LASER | Venezuela | |
| LSE | Línea De Aeroservicios | Chile | |||
| TUY | Línea Turística Aereotuy | AEREOTUY | Venezuela | ||
| ALR | Líneas Aéreas Alaire S.L. | AEROLAIRE | Spain | ||
| ZE | LCD | Líneas Aéreas Azteca | LINEAS AZTECA | Mexico | defunct |
| LCN | Líneas Aéreas Canedo LAC | CANEDO | Bolivia | ||
| LCM | Líneas Aéreas Comerciales | LINEAS COMERCIALES | Mexico | ||
| EDD | Líneas Aéreas Ejectuivas De Durango | LINEAS DURANGO | Mexico | ||
| EDR | Líneas Aéreas Eldorado | ELDORADRO | Colombia | ||
| FED | Líneas Aéreas Federales | FEDERALES | Argentina | ||
| LMN | Líneas Aéreas Monarca | LINEAS MONARCA | Mexico | ||
| LIJ | Líneas Aéreas San Jose | LINEAS JOSE | Mexico | ||
| UMA | Líneas Aéreas del Humaya | HUMAYA | Mexico | ||
| LEC | Linex | LECA | Central African Republic | ||
| SMS | Linhas Aéreas Santomenses | SANTOMENSES | São Tomé and Príncipe | ||
| TM | LAM | Linhas Aéreas de Moçambique | MOZAMBIQUE | Mozambique | |
| LAW | Link Airways of Australia | Australia | |||
| WGT | Volkswagen AirService GmbH | WORLDGATE | United Kingdom | ||
| JT | LNI | Lion Air | LION INTER | Indonesia | |
| LEU | Lions-Air | LIONSAIR | Switzerland | ||
| LYF | Lithuanian Air Force | LITHUANIAN AIRFORCE | Lithuania | safety department | |
| LRA | Little Red Air Service | LITTLE RED | Canada | ||
| LM | LVG | Livingston Energy Flight | LIVINGSTON | Italy | Ceased operations 2010 |
| LT | SNG | LJ Air | SNOW EAGLE | China | |
| LB | LLB | Lloyd Aéreo Boliviano | LLOYDAEREO | Bolivia | |
| LNA | Lnair Air Services | ELNAIR | Spain | ||
| XLG | Lockheed Air Terminal | United States | |||
| LAC | Lockeed Aircraft Corporation | LOCKHEED | United States | ||
| XDD | Lockheed DUATS | United States | |||
| CBD | Lockheed Martin Aeronautics | CATBIRD | United States | ||
| LNG | Lockheed Martin Aeronautics Company | LIGHTNING | United States | ||
| LM | LOG | Loganair | LOGAN | United Kingdom | Gained the code LM after beginning independent operations (2017) |
| CLV | Lom Praha Flying School | AEROTRAINING | Czech Republic | ||
| LMS | Lomas Helicopters | LOMAS | United Kingdom | ||
| LCY | London City Airport Jet Centre | LONDON CITY | United Kingdom | ||
| LNX | London Executive Aviation | LONEX | United Kingdom | ||
| LOV | London Flight Centre (Stansted) | LOVEAIR | United Kingdom | ||
| LHC | London Helicopter Centres | MUSTANG | United Kingdom | ||
| LSS | Lone Star Airlines | LONE STAR | United States | ||
| ORA | Long Island Airlines | LONG ISLAND | United States | ||
| GI | LHA | Longhao Airlines | AIR CANTON | China | |
| LGT | Longtail Aviation | LONGTAIL | Bermuda | ||
| GJ | CDC | Loong Air | LOONG AIR | China | |
| LRR | Lorraine Aviation | LORRAINE | France | ||
| LSC | Los Cedros Aviación | CEDROS | Chile | ||
| TAS | Lotus Air | LOTUS FLOWER | Egypt | ||
| LTW | Luchtvaartmaatschappij Twente | TWENTAIR | Netherlands | ||
| LKE | Lucky Air | LUCKY AIR | China | ||
| LUT | Luft Carago | LUGO | South Africa | ||
| LVD | Luftfahrt-Vermietungs-Dienst | AIR SANTE | Austria | ||
| LH | DLH | Lufthansa | LUFTHANSA | Germany | |
| LH | GEC | Lufthansa Cargo | LUFTHANSA CARGO | Germany | |
| CL | CLH | Lufthansa CityLine | HANSALINE | Germany | |
| L1 | Lufthansa Systems | Germany | |||
| LHT | Lufthansa Technik | LUFTHANSA TECHNIK | Germany | ||
| LTF | Lufttaxi Fluggesellschaft | Garfield | Germany | ||
| L5 | LTR | Lufttransport | LUFT TRANSPORT | Norway | |
| LHS | Luhansk | ENTERPRISE LUHANSK | Ukraine | ||
| UNY | Lund University School of Aviation | UNIVERSITY | Sweden | ||
| LG | LGL | Luxair | LUXAIR | Luxembourg | |
| LXA | Luxaviation | RED LION | Luxembourg | ||
| LUV | Luxembourg Air Rescue | LUX RESCUE | Luxembourg | ||
| LFE | Luxflight Executive | LUX EXPRESS | Luxembourg | ||
| LXO | Luxor Air | Egypt | |||
| LUZ | Luzair | LISBON JET | Portugal | ||
| 5V | UKW | Lviv Airlines | UKRAINE WEST | Ukraine | |
| LYD | Lydd Air | LYDDAIR | United Kingdom | ||
| LCH | Lynch Flying Service | LYNCH AIR | United States | ||
| L2 | LYC | Lynden Air Cargo | LYNDEN | United States | |
| LWG | Luxwing | LUXWING | Malta | ||
| Y9 | DAT | Lynx Air | DAUNTLESS | Canada | |
| LXF | Lynx Air International | LYNX FLIGHT | United States | ||
| L4 | SSX | Lynx Aviation | SHASTA | United States | Part of Frontier Airlines |
| LYX | Lynx Aviation | LYNX AIR | Pakistan | ||
| Z8 | AZN | Línea Aérea Amaszonas | Bolivia | ||
| MJ | LPR | Líneas Aéreas Privadas Argentinas | LAPA | Argentina | defunct |
| LAU | Líneas Aéreas Suramericanas | SURAMERICANO | Colombia | ||
| LT | SNG | LongJiang Airlines | SNOW EAGLE | China | |
| LYB | Lynden Air Cargo | HIGHLANDS | Papua New Guinea | ||
| Q2 | DQA | Maldivian (airline) | SKYSURFER | Maldives | |
| MMH | McMahon Helicopter | NIGHT RIDER | United States | 2015 [37] | |
| HOG | Mahogany Air Charters | HOGAN AIR | Zambia | 2014 [38] | |
| MTS | Med Jets | MED SERVICE | Mexico | 2014 [38] | |
| MSF | Minsheng International Jet | MEINSHENG | China | 2014 [38] | |
| MXS | Millon Express | MILLON EXPRESS | United States | Trading name for Sunrise Airlines allocated in 2014 [39] | |
| MHF | Maritime Helicopters | AIR MARITIME | United States | Allocated 2014 [40] | |
| BF | MRK | MarkAir | MARKAIR | United States | 1984-1995 |
| WD | MWM | Modern Transporte Aereo De Carga | MODERNAIR | Brazil | |
| MSJ | Magnum Air | MAGNUM AIR | Philippines | ||
| MWI | Malawian Airlines 2014 | MALAWIAN | Malawi | ||
| MYP | Mann Yadanarpon Airlines | MANN ROYAL | Myanmar | ||
| RDK | Memorial Hermann Hospital System | RED DUKE | United States | Houston, Texas | |
| MLV | Multiservicios Aereos Del Valle | MULTI VALLE | Mexico | ||
| MMJ | Macau Jet International | MACAUJET | China | ||
| MXF | Maximum Flight Advantages | MAXFLIGHT | United States | ||
| OD | MXD | Malindo Airways | MALINDO EXPRESS | Malaysia | |
| MJC | Mandarin Air | AIR MANDA | China | ||
| PLG | MBK-S | PILGRIM | Russia | ||
| DZR | Midwest Aviation | DOZER | United States | ||
| MSN | Milenium Air Servicios Aereos Integrados | Mexico | |||
| MFB | Mountain Flyers 80 | MOUNTAINHELI | Switzerland | ||
| HTL | My Fair Jet | HOTLINE | Austria | ||
| JNH | M & N Aviation | JONAH | United States | ||
| MCF | MAC Fotografica | MAC FOTO | Spain | ||
| MRG | MANAG'AIR | MANAG'AIR | France | ||
| AQ | MPJ | MAP-Management and Planung | MAPJET | Austria | |
| TFG | MAS Airways | TRAFALGAR | United Kingdom | ||
| M7 | MAA | MasAir | MAS CARGA | Mexico | |
| MY | MWG | MASwings | MASWINGS | Malaysia | |
| IN | MAK | MAT Macedonian Airlines | MAKAVIO | Macedonia | Defunct |
| MCC | MCC Aviation | DISCOVERY | South Africa | ||
| MGA | MG Aviación | MAG AVACION | Spain | ||
| JLA | MIA Airlines | SALLINE | Romania | ||
| OM | MGL | MIAT Mongolian Airlines | MONGOL AIR | Mongolia | |
| MNC | MIT Airlines | MUNCIE | Canada | ||
| MKA | MK Airline | KRUGER-AIR | Ghana | ||
| MB | MNB | MNG Airlines | BLACK SEA | Turkey | |
| EBF | MSR Flug-Charter | SKYRUNNER | Germany | ||
| MCV | MTC Aviación | MTC AVIACION | Mexico | ||
| MAQ | Mac Aviation | MAC AVIATION | Spain | ||
| MCN | Mac Dan Aviation Corporation | MAC DAN | United States | ||
| MTD | MacKnight Airlines | Australia | |||
| CC | MCK | Macair Airlines | Australia | ||
| MCS | Macedonian Airlines | MACAIR | Greece | ||
| MDH | Madina Air | MADINA AIR | Libya | ||
| DM | DAN | Maersk Air | MAERSKAIR | Denmark | Defunct |
| VB | MSK | Maersk Air UK | BLUESTAR | United Kingdom | Defunct, later became Duo Airways |
| MJB | Magic Blue Airlines | MAGIC BLUE | Netherlands | ||
| MGR | Magna Air | MAGNA AIR | Austria | ||
| MLH | Mahalo Air | MAHALO | United States | ||
| W5 | IRM | Mahan Air | MAHAN AIR | Iran | |
| M2 | MZS | Mahfooz Aviation | MAHFOOZ | Gambia | |
| MAT | Maine Aviation | MAINE-AV | United States | ||
| MAJ | Majestic Airlines | MAGIC AIR | United States | ||
| AKM | Mak Air | MAKAIR | Kazakhstan | ||
| MLG | Malagasy Airlines | Madagascar | |||
| MLX | Malawi Express | MALAWI EXPRESS | Malawi | ||
| MKK | Malaya Aviatsia Dona | AEROKEY | Russia | ||
| MH | MAS | Malaysia Airlines | MALAYSIAN | Malaysia | |
| DB | MLT | Maleth-Aero | Malta | ||
| MAE | Mali Air | MALI AIREXPRESS | Austria | ||
| VXP | Mali Air Express | AVION EXPRESS | Mali | ||
| MTZ | Mali Airways | MALI AIRWAYS | Mali | ||
| MLC | Malila Airlift | MALILA | Democratic Republic of the Congo | ||
| MLS | Mall Airways | MALL-AIRWAYS | United States | ||
| LOD | Malmoe Air Taxi | LOGIC | Sweden | ||
| TF | SCW | Malmö Aviation | SCANWING | Sweden | |
| MAY | Malta Air | Malta | 2019 | ||
| R5 | MAC | Malta Air Charter | MALTA CHARTER | Malta | Defunct? |
| MWS | Malta Wings | MALTA WINGS | Malta | ||
| MA | MAH | Malév Hungarian Airlines | MALEV | Hungary | defunct |
| MLB | Manaf International Airways | MANAF | Burundi | ||
| RI | MDL | Mandala Airlines | MANDALA | Indonesia | |
| AE | MDA | Mandarin Airlines | MANDARIN | Taiwan | |
| JE | MNO | Mango | TULCA | South Africa | |
| MHN | Manhattan Air | MANHATTAN | United Kingdom | ||
| MTO | Marathon Airlines | MARATHON | Greece | ||
| MNR | Mann Air | TEEMOL | United Kingdom | ||
| MAN | Mannion Air Charter | MANNION | United States | ||
| MTS | Mantrust Asahi Airways | MANTRUST | Indonesia | ||
| MNX | Manx Airlines | MANX | United Kingdom | ||
| MAD | Maple Air Services | MAPLE AIR | Canada | ||
| MAR | March Helicopters | MARCH | United Kingdom | ||
| MCP | Marcopolo Airways | MARCOPOLO | Afghanistan | ||
| MGI | Marghi Air | MARGHI | Nigeria | ||
| MRK | Markair | MARKAIR | United States | ||
| MKO | Markoss Aviation | GOSHAWK | United Kingdom | ||
| 6V | MRW | Mars RK | AVIAMARS | Ukraine | |
| MCE | Marshall Aerospace | MARSHALL | United Kingdom | ||
| M7 | MSL | Marsland Aviation | MARSLANDAIR | Sudan | |
| XMA | Martin Aviation Services | United States | |||
| MBE | Martin-Baker | MARTIN | United Kingdom | ||
| MP | MPH | Martinair | MARTINAIR | Netherlands | |
| MRA | Martinaire | MARTEX | United States | ||
| MFA | Martyn Fiddler Associates | SEAHORSE | United Kingdom | ||
| MVN | Marvin Limited | MARVIN | United Kingdom | ||
| TRP | Maryland State Police | TROOPER | United States | ||
| MTH | Massachusetts Institute of Technology | RESEARCH | United States | ||
| MSY | Massey University School of Aviation | MASSEY | New Zealand | ||
| MSW | Master Airways | MASTER AIRWAYS | Serbia | ||
| MPL | Master Planner | United States | |||
| LMJ | Masterjet | MASTERJET | Portugal | ||
| Q4 | Mastertop Linhas Aéreas | Brazil | |||
| MIA | Mauria | MAURIA | Mauritania | ||
| MNV | Mauritanienne Aerienne Et Navale | NAVALE | Mauritania | ||
| MRF | Mauritanienne Air Fret | MAUR-FRET | Mauritania | ||
| MWY | Mauritanienne Airways | MAURITANIENNE | Mauritania | ||
| MDE | Mauritanienne De Transport Aerien | MAURI-TRANS | Mauritania | ||
| MVR | Maverick Airways | MAV-AIR | United States | ||
| H5 | MVL | Mavial Magadan Airlines | Mavial | Russia | |
| MAI | Max Avia | MAX AVIA | Kyrgyzstan | ||
| MSF | Max Sea Food | MAXESA | El Salvador | ||
| MAX | Max-Aviation | MAX AVIATION | Canada | ||
| 8M | MXL | Maxair | MAXAIR | Sweden | |
| MXU | Maximus Air Cargo | CARGO MAX | United Arab Emirates | ||
| MY | MXJ | Maxjet Airways | MAX-JET | United States | Defunct |
| MXS | Maxsus-Avia | MAXSUS-AVIA | Uzbekistan | ||
| MXP | May Air Xpress | BEECHNUT | United States | ||
| MW | MYD | Maya Island Air | MYLAND | Belize | |
| 7M | MYI | Mayair | MAYAIR | Mexico | |
| MBS | Mbach Air | MBACHI AIR | Malawi | Ground Services | |
| MCH | McAlpine Helicopters | MACLINE | United Kingdom | ||
| MKL | McCall Aviation | MCCALL | United States | ||
| DAC | McDonnell Douglas | DACO | United States | ||
| MDS | McNeely Charter Services | MID-SOUTH | United States | ||
| MEK | Med-Trans of Florida | MED-TRANS | United States | ||
| MDM | Medavia | MEDAVIA | Malta | ||
| MRZ | Medical Air Rescue Services | MARS | Zimbabwe | ||
| MCL | Medical Aviation Services | MEDIC | United Kingdom | ||
| MDF | Mediterranean Air Freight | MED-FREIGHT | Greece | ||
| MDY | Mediterranean Airways | Egypt | |||
| MEJ | Medjet International | MEDJET | United States | ||
| MGK | Mega | MEGLA | Kazakhstan | ||
| MEL | Mega Linhas Aéreas | MEGA AIR | Brazil | ||
| M8 | MKN | Mekong Airlines | MEKONG AIRLINES | Cambodia | Defunct |
| IM | MNJ | Menajet | MENAJET | Lebanon | |
| Mercer Airlines | United States | Defunct | |||
| MXX | Merchant Express Aviation | MERCHANT | Nigeria | ||
| MEC | Mercury Aircourier Service | MERCAIR | United States | ||
| POV | Meridian | AIR POLTAVA | Ukraine | ||
| MRD | Meridian Air Cargo | MERIDIAN | United States | ||
| MHL | Meridian Airlines | HASSIMAIR | Nigeria | ||
| DSL | Meridian Aviation | DIESEL | United Kingdom | ||
| MEM | Meridian Limited | MERIDIAN CHERRY | Ukraine | ||
| IG | ISS | Meridiana | MERIDIANA | Italy | Callsign was MERAIR |
| MEI | Merlin Airways | AVALON | United States | ||
| MZ | MNA | Merpati Nusantara Airlines | MERPATI | Indonesia | |
| YV | ASH | Mesa Airlines | AIR SHUTTLE | United States | |
| XJ | MES | Mesaba Airlines | MESABA | United States | |
| MSQ | Meta Linhas Aéreas | META | Brazil | ||
| MET | Meteorological Research Flight | METMAN | United Kingdom | METMAN1 callsign currently used by FAAM Airborne Laboratory, operated by Airtask Group | |
| MER | Methow Aviation | METHOW | United States | ||
| MVI | Metro Business Aviation | United Kingdom | |||
| MEX | Metro Express | EAGLE EXPRESS | United States | ||
| MTR | Metroflight | METRO | United States | ||
| MTJ | Metrojet | METROJET | Hong Kong | ||
| PIX | Metropix UK | METROPIX | United Kingdom | ||
| MPS | Metropolis | METRO REGIONAL | Netherlands | Metropolis Noord 1 | |
| MXB | Mex Blue | MEX BLUE | Mexico | ||
| MJT | Mex-Jet | MEJETS | Mexico | ||
| GJ | MXC | Mexicargo | MEXICARGO | Mexico | defunct |
| MXA | Mexicana de Aviación | MEXICANA | Mexico | ||
| MXT | México Transportes Aéreos | TRANSMEX | Mexico | ||
| HUR | Miami Air Charter | HURRICANE CHARTER | United States | ||
| LL | BSK | Miami Air International | BISCAYNE | United States | Previous IATA Code "GL" |
| OWL | Miami Valley Aviation | NIGHT OWL | United States | ||
| MPT | Miapet-Avia | MIAPET | Armenia | ||
| BIB | Michelin Air Services | France | |||
| WIZ | Micromatter Technology Solutions | WIZARD | United Kingdom | ||
| NYL | Mid Airlines | NILE | Sudan | ||
| MPA | Mid-Pacific Airlines | MID PAC | United States | ||
| MJR | Midamerica Jet | MAJOR | United States | ||
| ME | MEA | Middle East Airlines | CEDAR JET | Lebanon | |
| MID | Midland Airport Services | United Kingdom | |||
| MFR | Midline Air Freight | MIDLINE FREIGHT | United States | ||
| MIS | Midstate Airlines | MIDSTATE | United States | ||
| JI | MDW | Midway Airlines (1993–2003) | MIDWAY | United States | defunct |
| ML | MDW | Midway Airlines (1976–1991) | MIDWAY | United States | defunct |
| FLA | Midway Express | PALM | United States | ||
| FAX | Midwest Air Freighters | FAIRFAX | United States | ||
| YX | MEP | Midwest Airlines | MIDEX | United States | |
| MY | MWA | Midwest Airlines (Egypt) | Egypt | ||
| NIT | Midwest Aviation | NIGHTTRAIN | United States | ||
| MWT | Midwest Aviation Division | MIDWEST | United States | ||
| HTE | Midwest Helicopters De Mexico | HELICOPTERSMEXICO | Mexico | ||
| MJ | MLR | Mihin Lanka | MIHIN LANKA | Sri Lanka | |
| MAB | Millardair | MILLARDAIR | Canada | ||
| RJM | Millen Corporation | MILLEN | United Kingdom | ||
| MLK | Millennium Air | NIGERJET | Nigeria | ||
| DLK | Millennium Airlines | DEKKANLANKA | Sri Lanka | ||
| MFS | Miller Flying Services | MILLER TIME | United States | ||
| OXO | Million Air | MILL AIR | United States | ||
| MIM | Mimino | MIMINO | Russia | ||
| NAB | Mina Airline Company | Egypt | |||
| OMR | Minair | ORMINE | Central African Republic | ||
| EBE | Minebea Technologies | MINEBEA | United States | ||
| MAZ | Mines Air Services Zambia | MINES | Zambia | ||
| MNL | Miniliner | MINILINER | Italy | ||
| MNS | Ministic Air | MINISTIC | Canada | ||
| WDG | Ministry of Agriculture, Fisheries and Food | WATCHDOG | United Kingdom | ||
| LIR | Minsk Aircraft Overhaul Plant | LISLINE | Belarus | ||
| MIC | Mint Airways | MINT AIRWAYS | Spain | ||
| MIR | Miramichi Air Service | MIRAMICHI | Canada | ||
| MIF | Miras | MIRAS | Kazakhstan | ||
| MOS | Misr Overseas Airways | Egypt | |||
| MAF | Mission Aviation Fellowship | MISSI | Indonesia | ||
| MSN | Missionair | MISIONAIR | Spain | ||
| MRN | Missions Gouvernemtales Francaises | MARIANNE | France | ||
| BDG | Mississippi State University | BULLDOG | United States | ||
| XV | MVA | Mississippi Valley Airlines | VALAIR | United States | |
| M4 | MSA | Mistral Air | AIRMERCI | Italy | renamed Poste Air Cargo |
| MJF | MJET | EM-EXPRESS | Austria | ||
| MBO | Mobil Oil | MOBIL | Canada | ||
| MXE | Mocambique Expresso | MOZAMBIQUE EXPRESS | Mozambique | ||
| MFZ | Mofaz Air | MOFAZ AIR | Malaysia | ||
| MOW | Mohawk Airlines | MOHAWK AIR | United States | ||
| MW | MUL | Mokulele Airlines | MUKULELE | United States | Callsign and code changed from BUG/SPEEDBUGGY in 2013 |
| MLE | Moldaeroservice | MOLDAERO | Moldova | ||
| 2M | MDV | Moldavian Airlines | MOLDAVIAN | Moldova | |
| MVG | Moldova | MOLDOVA-STATE | Moldova | ||
| RRV | Mombasa Air Safari | SKYROVER | Kenya | ||
| ZB | MON | Monarch Airlines | MONARCH | United Kingdom | defunct October 2017 |
| MNH | Monarch Airlines | MONARCH AIR | United States | ||
| 8I | Myway Airlines | Italy | |||
| MFC | Moncton Flying Club | EAST WIND | Canada | ||
| MDB | Monde Air Charters | MONDEAIR CARGO | United Kingdom | ||
| MTI | Monerrey Air Taxi | MONTERREY AIR | Mexico | ||
| MKY | Monky Aerotaxis | MONKY | Mexico | ||
| YM | MGX | Montenegro Airlines | MONTENEGRO | Montenegro | former callsign was "MONTAIR" |
| 5M | MNT | Montserrat Airways | MONTSERRAT | Montserrat | |
| MNY | Mooney Aircraft Corporation | MOONEY FLIGHT | United States | ||
| MAL | Morningstar Air Express | MORNINGSTAR | Canada | ||
| MSS | Morris Air Service | WASATCH | United States | ||
| MRO | Morrison Flying Service | MORRISON | United States | ||
| 3R | GAI | Moskovia Airlines | GROMOV AIRLINE | Russia | JSC |
| MPI | Mosphil Aero | MOSPHIL | Philippines | ||
| M9 | MSI | Motor Sich Airlines | MOTOR SICH | Ukraine | |
| NM | NZM | Mount Cook Airline | MOUNTCOOK | New Zealand | |
| MTN | Mountain Air Cargo | MOUNTAIN | United States | ||
| N4 | MTC | Mountain Air Company | MOUNTAIN LEONE | Sierra Leone | |
| PKP | Mountain Air Express | PIKES PEAK | United States | ||
| BRR | Mountain Air Service | MOUNTAIN AIR | United States | ||
| MBI | Mountain Bird | MOUNTAIN BIRD | United States | ||
| MHA | Mountain High Aviation | MOUNTAIN HIGH | United States | ||
| MPC | Mountain Pacific Air | MOUNTAIN PACIFIC | Canada | ||
| MTV | Mountain Valley Air Service | MOUNTAIN VALLEY | United States | ||
| MDN | Mudan Airlines | Somali Republic | |||
| CMJ | Mudanjiang General Aviation | MUDANJIANG | China | ||
| MTX | Multi Taxi | MULTITAXI | Mexico | ||
| WBR | Multi-Aero | WEBER | United States | ||
| MFT | Multiflight | YORKAIR | |||
| MNZ | Murmansk Aircompany | MURMAN AIR | Russia | ||
| MUA | Murray Air | MURRAY AIR | United States | ||
| MMR | Musrata Air Transport | MUSRATA AIR | Libya | ||
| MAW | Mustique Airways | MUSTIQUE | Barbados | ||
| Z9 | MYM | MYAirline | MYAIR | Malaysia | defunct |
| MYW | MyWay Airlines | MYSKY | Georgia | ||
| VZ | MYT | MyTravel Airways | KESTREL | United Kingdom | Defunct, callsign now used by Thomas Cook Airlines |
| UB | UBA | Myanma Airways | UNIONAIR | Myanmar | |
| 8M | MMA | Myanmar Airways International | MYANMAR | Myanmar | |
| MAV | Minoan Air | MINOAN | Greece | ||
| MYA | Myflug | MYFLUG | Iceland | ||
| VKG | MyTravel Airways | VIKING | Denmark | defunct; callsign now used by Thomas Cook Airlines Scandinavia | |
| AAD | Mann Air Ltd | Ambassador | United Kingdom | t/a Ambassador | |
| M2 | MHV | MHS Aviation GmbH | SNOWCAP | Germany | |
| MTU | Middle Tennessee State University | BLUE RAIDER | United States | 2019 [41] | |
| NP | NIA | Nile Air | NILE BIRD | Egypt | |
| SIQ | National Center for Atmospheric Research | SCIENCE QUEST | United States | ||
| NEJ | Netjets Business Aviation | NET BUSINESS | China | ||
| NHV | NHV Aviation | Ghana | |||
| NHC | Northern Helicopter | NORTHERN | Germany | ||
| DMD | Namdeb Diamond Corporation | DIAMONDJET | Namibia | ||
6N | NIN | Niger Airlines | NIGER AIRLINES | Niger | |
| N5 | FEY | Fly Easy | FLYEASY | India | |
| NUB | Nomad Aviation | VALLETTA | Malta | ||
| NJA | New Japan Aviation | SHIN NIHON | Japan | ||
| ROW | Nor Aviation | ROTORWING | Norway | ||
| NLG | NEL Cargo | NELCARGO | Ivory Coast | ||
| NHG | NHT Linhas Aéreas | HELGA | Brazil | ||
| WAR | NZ Warbirds Association | WARBIRDS | New Zealand | ||
| ANL | Nacoia Lda | AIR NACOIA | Angola | ||
| NHZ | Nada Air Service | NADA AIR | Chad | ||
| BFN | Compangnie Nationale Naganagani | Burkina Faso | |||
| NAH | Nahanni Air Services Ltd | NAHANNI | Canada | ||
| NKL | Nakheel Aviation | NAKHEEL | United Arab Emirates | ||
| MRE | Namibia Commercial Aviation | MED RESCUE | Namibia | ||
| NDF | Namibian Defence Force | NAMIBIAN AIR FORCE | Namibia | ||
| CNJ | Nanjing Airlines | NINGHANG | China | ||
| DV | ACK | Nantucket Airlines | ACK AIR | United States | WAS 9k |
| NYA | Nanyah Aviation | NANYAH | Israel | ||
| NAP | Napier Air Service Inc | NAPIER | United States | ||
| NCM | Nas Air | AIR BANE | Angola | ||
| P9 | Nas Air | Mali | |||
| UE | NAS | Nasair | NASAIRWAYS | Eritrea | |
| NJC | Nashville Jet Charters | NASHVILLE JET | United States | ||
| NCO | Natalco Air Lines | NATALCO | São Tomé and Príncipe | ||
| NTK | National Air Traffic Controllers Association | NATCA | United States | ||
| NSR | National Air Charter | NASAIR | Indonesia | ||
| RFI | National Air Traffic Services | SHERLOCK | United Kingdom | ||
| NAN | National Airlines | NATION AIR | United States | defunct | |
| N4 | NCN | National Airlines | Chile | ||
| N7 | ROK | National Airlines | RED ROCK | United States | defunct |
| NA | NAL | National Airlines | NATIONAL | United States | defunct |
| N8 | NCR | National Air Cargo dba National Airlines | NATIONAL CARGO | United States | |
| 9Y | NAE | National Airways Ethiopia | NATIONAL | Ethiopia | |
| IN | NIH | NAM Air | NAM | Indonesia | |
| KUS | National Airlines | KUSWAG | South Africa | ||
| 9O | National Airways Cameroon | Cameroon | |||
| LFI | National Airways Corporation | AEROMED | South Africa | ||
| GTY | National Aviation Company | Egypt | |||
| TNC | National Aviation Consultants | NATCOM | Canada | ||
| NXT | National Express | NATIONAL FREIGHT | United States | Texas Air Charters | |
| GRD | National Grid plc | GRID | United Kingdom | ||
| NC* | JTE | National Jet Express | JETEX | Australia | |
| AND | National Jet Service | AIR INDIANA | United States | ||
| NC* | NJS | National Jet Systems | NATIONAL JET | Australia | defunct acquired by Qantas |
| NOL | National Overseas Airlines Company | NAT AIRLINE | Egypt | ||
| NLS | Nationale Luchtvaartschool | PANDER | Netherlands | ||
| NAE | Nations Air Express Inc | NATIONS EXPRESS | United States | ||
| CE | NTW | Nationwide Airlines | NATIONWIDE | South Africa | |
| NWZ | Nationwide Airlines (Zambia) | ZAMNAT | Zambia | ||
| EVM | Natural Environment Research Council | SCIENCE | United Kingdom | ||
| NRR | Natureair | NATUREAIR | Costa Rica | ||
| NRK | Naturelink Charter | NATURELINK | South Africa | ||
| NVC | Nav Canada | NAV CAN | Canada | ||
| NAV | Nav Flight Planning | NAV DISPATCH | Czech Republic | ||
| NVP | Navegacao Aérea De Portugal | Portugal | |||
| NAY | Navegación Servicios Aéreos Canarios S.A. | NAYSA | Spain | ||
| IRI | Navid | NAVID | Iran | ||
| NVM | Naviera Mexicana | NAVIERA | Mexico | ||
| NVL | Navigator Airlines | NAVLINES | Armenia | ||
| XNV | Navinc Airlines Services | United States | Tigin Limited | ||
| 1N | Navitaire | United States | |||
| XNS | Navtech System Support | Canada | |||
| NZA | Nayzak Air Transport | Libya | |||
| NEB | State of Nebraska | NEBRASKA | United States | ||
| NEC | Necon Air | NECON AIR | Nepal | ||
| NCG | Nederlandse Kustwacht | NETHERLANDS COASTGUARD | Netherlands | ||
| NFT | Nefteyugansk Aviation Division | NEFTEAVIA | Russia | ||
| NLA | Neiltown Air | NEILTOWN AIR | Canada | ||
| NLC | Nelair Charters | NELAIR | South Africa | ||
| CGE | Nelson Aviation College | COLLEGE | New Zealand | ||
| RA | RNA | Nepal Airlines | ROYAL NEPAL | Nepal | was Royal Nepal Airlines |
| NO | NOS | Neos | MOONFLOWER | Italy | |
| TOX | Neosiam Airways | SKY KINGDOM | Thailand | ||
| NSL | Neric | NERICAIR | United Kingdom | ||
| NE | NMA | Nesma Airlines | NESMA | Egypt | |
| 1I | EJA | NetJets | EXECJET | United States | |
| NET | Network Aviation Services | NETWORK | Nigeria | ||
| NEZ | New England Air Express | ENGAIR | United States | ||
| EJ | NEA | New England Airlines | NEW ENGLAND | United States | |
| NHT | New Heights 291 | NEWHEIGHTS | South Africa | ||
| NWD | New World Jet Corporation | NEW WORLD | United States | ||
| NYH | New York Helicopter | NEW YORK | United States | ||
| GRY | New York State Police | GRAY RIDER | United States | ||
| KRC | Royal New Zealand Air Force | KIWI RESCUE | New Zealand | ||
| HVA | Newair | HAVEN-AIR | United States | ||
| NLT | Newfoundland Labrador Air Transport | NALAIR | Canada | ||
| 2N | NTJ | NextJet | NEXTJET | Sweden | |
| NXF | Nextflight Aviation | NEXTFLIGHT | United States | ||
| NXS | Nexus Aviation | NEXUS AVIATION | Nigeria | ||
| NIS | Nicaragüense de Aviación | NICA | Nicaragua | ||
| NCN | Nicon Airways | NICON AIRWAYS | Nigeria | Ceased operations 2007 | |
| NGA | Nigeria Airways | NIGERIA | Nigeria | ||
| NGR | Nigerian Air Force | NIGERIAN AIRFORCE | Nigeria | ||
| NGX | Nigerian Global | AIR GLOBAL | Nigeria | ||
| EXT | Nightexpress | EXECUTIVE | Germany | ||
| HG | NLY | Niki | FLYNIKI | Austria | |
| NKV | Nikolaev-Air | AIR NIKOLAEV | Ukraine | Airline of Special Purpose | |
| NSA | Nile Safaris Aviation | NILE SAFARIS | Sudan | ||
| NVA | Nile Valley Aviation Company | Egypt | defunct | ||
| NLW | Nile Wings Aviation Services | NILE WINGS | Sudan | ||
| NBS | Nimbus Aviation | NIMBUS | United Kingdom | ||
| NSR | Nine Star Airways | AIR STAR | Thailand | 2014 [42] | |
| KZ | NCA | Nippon Cargo Airlines | NIPPON CARGO | Japan | |
| NVK | Nizhnevartovskavia | VARTOSKAVIA | Russia | ||
| NOH | No. 32 (The Royal) Squadron | NORTHOLT | United Kingdom | ||
| AKG | No. 84 Squadron RAF | GRIFTER | United Kingdom | ||
| NBL | Nobil Air | NOBIL AIR | Moldova | ||
| DD | NOK | Nok Air | NOK AIR | Thailand | |
| XW | NCT | NokScoot | BIG BIRD | Thailand | |
| NRL | Nolinor Aviation | NOLINOR | Canada | ||
| NMD | Nomad Aviation | NOMAD AIR | Namibia | ||
| OMD | Nomadic Aviation Group LLC | NOMADIC | United States | ||
| NOC | Norcopter | NORCOPTER | Norway | ||
| NEF | Nord-Flyg | NORDEX | Sweden | ||
| 5N | AUL | Nordavia | ARCHANGELSK AIR | Russia | |
| JH | NES | Nordeste Linhas Aéreas Regionais | NORDESTE | Brazil | |
| 6N | NRD | Nordic Regional | NORTH RIDER | Sweden | |
| Y7 | TYA | NordStar | TAIMYR | Russia | |
| NDS | Nordstree (Australia) | Australia | |||
| N4 | NWS | Nordwind Airlines | NORDLAND | Russia | |
| NRT | Norestair | NORESTAIR | Spain | ||
| N5 | Norfolk Air | Norfolk Island | Defunct | ||
| NCF | Norfolk County Flight College | COUNTY | United Kingdom | ||
| FNA | Norlandair | NORLAND | Iceland | ||
| NOA | Norontair | NORONTAIR | Canada | ||
| HMF | Norrlandsflyg | LIFEGUARD SWEDEN | Sweden | ||
| NRX | Norse Air Charter | NORSE AIR | South Africa | ||
| N0 | NBT | Norse Atlantic Airways | LONGSHIP | Norway | |
| Z0 | UBT | Norse Atlantic UK | LONGBOAT | United Kingdom | |
| NIR | Norsk Flytjeneste | NORSEMAN | Norway | ||
| NOR | Norsk Helikopter | NORSKE | Norway | ||
| DOC | Norsk Luftambulanse | HELIDOC | Norway | ||
| RTV | Nortavia | TIC-TAC | Portugal | ||
| NAI | North Adria Aviation | NORTH-ADRIA | Croatia | ||
| NA | NAO | North American Airlines | NORTH AMERICAN | United States | |
| HMR | North American Charters | HAMMER | Canada | ||
| NAJ | North American Jet Charter Group | JET GROUP | United States | ||
| NAT | North Atlantic Air Inc | MASS AIR | United States | ||
| NFC | North Atlantic Cargo | NORTH ATLANTIC | Norway | ||
| NBN | North British Airlines | TEESAIR | United Kingdom | ||
| NCB | North Caribou Flying Service Ltd | NORTH CARIBOU | Canada | ||
| N/A | N/A | North Coast Air Services Ltd | NORTH COAST | Canada | |
| N9 | North Coast Aviation | Papua New Guinea | |||
| M3 | NFA | North Flying | NORTH FLYING | Denmark | |
| NRC | North Sea Airways | NORTH SEA | Netherlands | ||
| SBX | North Star Air Cargo | SKY BOX | United States | ||
| NRV | North Vancouver Airlines | NORVAN | Canada | ||
| NWW | North West Airlines | HALANT | Australia | ||
| PTO | North West Geomatics | PHOTO | Canada | ||
| NEN | North-East Airlines | NORTHEAST SWAN | Nigeria | ||
| VBG | North-West Air Transport Company - Vyborg | VYBORG AIR | Russia | ||
| HW | NWL | North-Wright Airways | NORTHWRIGHT | Canada | |
| NLL | Northafrican Air Transport | NORTHAFRICAN AIR | Libya | ||
| NFL | Northaire Freight Lines | GREAT LAKES | United States | ||
| NSF | Northamptonshire School of Flying | NORTON | United Kingdom | ||
| NCE | Northcoast Executive Airlines | TOP HAT | United States | ||
| NE | NEE | Northeast Airlines | NORTHEAST | United States | |
| NPX | Northeast Aviation | NORTHEAST EXPRESS | United States | ||
| NEW | Northeastern Aviation | MEADOW FLIGHT | United States | 2014 [42] | |
| NC* | NAC | Northern Air Cargo | YUKON | United States | |
| BYC | Northern Airlines Sanya | BEIYA | China | ||
| NDA | Northern Airways | NORTHERN DAKOTA | United States | ||
| CMU | Northern Aviation Service | LANNA AIR | Thailand | ||
| U7 | Northern Dene Airways | Canada | |||
| NEX | Northern Executive Aviation | NEATAX | United Kingdom | ||
| NIC | Northern Illinois Commuter | ILLINOIS COMMUTER | United States | ||
| NTX | Northern Jet Management | NORTAX | United States | ||
| 7H | RVF | Northern Pacific Airways | —Raven Flight | United States | |
| NTA | Northern Thunderbird Air | THUNDERBIRD | Canada | ||
| KOE | Northland Aviation | KOKEE | United States | ||
| NSS | Northstar Aviation | NORTHSTAR | United States | ||
| NHL | Northumbria Helicopters | NORTHUMBRIA | United Kingdom | ||
| NAL | Northway Aviation Ltd | NORTHWAY | Canada | ||
| NWE | Northwest Aero Associates | United States | |||
| NW | NWA | Northwest Airlines | NORTHWEST | United States | defunct merged with Delta Air Lines |
| FY | NWR | Northwest Regional Airlines | Australia | ||
| NWT | Northwest Territorial Airways | TERRITORIAL | Canada | ||
| J3 | PLR | Northwestern Air | POLARIS | Canada | |
| NWN | Northwinds Northern | NORTHWINDS | Canada | ||
| NAM | Nortland Air Manitoba | MANITOBA | Canada | ||
| D8* | IBK | Norwegian Air International | NORTRANS | Ireland | subsidiary of Norwegian Air Shuttle (Ceased operations 2021) |
| DY | NOZ | Norwegian Air Shuttle | NORDIC | Norway | |
| DI | NRS | Norwegian Air UK | REDNOSE* | United Kingdom | subsidiary of Norwegian Air Shuttle (Ceased operations 2021) [43] |
| DN | NAA | Norwegian Air Argentina | NORUEGA | Argentina | subsidiary of Norwegian Air Shuttle (Ceased operations 2019) |
| DU | NLH | Norwegian Long Haul | NORSTAR | Norway | subsidiary of Norwegian Air Shuttle (Ceased operations 2021) [44] |
| DH | NAN | Norwegian Air Norway | NORSHIP | Norway | subsidiary of Norwegian Air Shuttle (transferred sole aircraft back to Norwegian Air Shuttle AOC in 2023) [45] |
| D8 | NSZ | Norwegian Air Sweden | REDNOSE | Sweden | subsidiary of Norwegian Air Shuttle |
| TFN | Norwegian Aviation College | SPIRIT | Norway | ||
| XNT | Notams International | United States | |||
| BJ | LBT | Nouvel Air Tunisie | NOUVELAIR | Tunisia | |
| O9 | NOV | Nova Airways | NOVANILE | Sudan | |
| PTR | Nova Scotia Department of Lands and Forests | PATROL | Canada | ||
| 1I | NVR | Novair | NAVIGATOR | Sweden | |
| VQ | NVQ | Novo Air | NOVO AIR | Bangladesh | |
| NVG | Novgorod Air Enterprise | SADKO AVIA | Russia | ||
| NSP | Novosibirsk Aircraft Repairing Plant | NARPAIR | Russia | ||
| NBE | Novosibirsk Aviaenterprise | NAKAIR | Russia | ||
| NPO | Novosibirsk Aviation Production Association | NOVSIB | Russia | ||
| NOY | Noy Aviation | NOY AVIATION | Israel | ||
| N6 | ACQ | Nuevo Continente | AERO CONTINENTE | Peru | Operating license revoked by Chile 10/06/2002; Ceased operations 2005; Former name: Aero Continente |
| NHR | Nuevo Horizonte Internacional | NUEVO HORIZONTE | Mexico | ||
| NUN | Nunasi-Central Airlines | NUNASI | Canada | ||
| NIN | Nurman Avia Indopura | NURVINDO | Indonesia | ||
| NYS | Nyasa Express | NYASA | Malawi | ||
| 1I | NJE | NetJets Europe | FRACTION | Portugal | |
| ORN | Orange Air | ORANGE JET | United States | Allocated in 2014 [46] | |
| IP | ONS | One Airlines | AIR DREAMS | Chile | |
| FET | Old Dominion Freight Lines | FREIGHT LINE | United States | ||
| OCN | O Air | O-BIRD | France | defunct | |
| UQ | OCM | O'Connor Airlines | OCONNOR | Australia | Defunct - Bankrupt |
| DRL | Omni Air Transport | DRILLER | United States | ||
| OWE | Owenair | OWENAIR | South Africa | ||
| OB | AAN | Oasis Airlines | Oasis | Spain | defunct |
| O8 | OHK | Oasis Hong Kong Airlines | OASIS | Hong Kong | Defunct |
| BCN | Ocean Air | BLUE OCEAN | Mauritania | ||
| VC | VCX | Ocean Airlines | OCEANCARGO | Italy | |
| OCS | Ocean Sky UK | OCEANSKY | United Kingdom | ||
| TUK | Ocean Wings Commuter Service | TUCKERNUCK | United States | New Island Connections | |
| O2 | Linear Air | HARPOON | United States | Allocated in 2017 | |
| ODS | Odessa Airlines | ODESSA AIR | Ukraine | ||
| FOC | Office Federal De'Aviation Civile | FOCA | Switzerland | ||
| GBO | Ogooue Air Cargo | Gabon | |||
| OKJ | Okada Airlines | OKADA AIR | Nigeria | ||
| OKP | Okapi Airways | OKAPI | Democratic Republic of Congo | ||
| OKA | Okay Airways | OKAYJET | China | ||
| OKL | Oklahoma Department of Public Safety | OKLAHOMA | United States | Troop O | |
| OLX | Olimex Aerotaxi | OLIMEX | Czech Republic | ||
| KVK | Olimp Air | PONTA | Kazakhstan | ||
| OL | OLT | OLT Express Germany | OLTRA | Germany | |
| OA | OAL | Olympic Air | OLYMPIC | Greece | |
| OLY | Olympic Aviation | OLAVIA | Greece | ||
| WY | OMA | Oman Air | OMAN AIR | Oman | |
| ORF | Oman Royal Flight | OMAN | Oman | ||
| OV | OMS | SalamAir | MAZOON | Oman | Oman’s first Low Cost Carrier |
| OAV | Omni - Aviacao e Tecnologia | OMNI | Portugal | ||
| OY | OAE | Omni Air International | OMNI-EXPRESS | United States | |
| ONI | OMNI AVIATION TRAINING CENTER | OMNI TRAINING | Portugal | Part of the same group as Omni - Aviacao e Tecnologia | |
| OMF | Omniflys | OMNIFLYS | Mexico | ||
| ORL | On Air Limited | ON AIR | Canada | ||
| OST | Oklahoma State University | OSTATE | United States | ||
| OTG | One Two Go Airlines | THAI EXPRESS | Thailand | ||
| OTM | Onetime Airlines Zambia | ZEDTIME | Zambia | ||
| MED | Ontario Ministry of Health | MEDICAL | Canada | ||
| 8Q | OHY | Onur Air | ONUR AIR | Turkey | |
| OPA | Opal Air | Australia | |||
| OSA | Open Sky Aviation | Lebanon | |||
| BOS | OpenSkies | MISTRAL | United Kingdom | ||
| ORR | Operadora Turistica Aurora | TURISTICA AURORA | Mexico | ||
| OLE | Operadora de Lineas Ejecutivas | OPERADORA | Mexico | ||
| OTP | Operadora de Transportes Aéreos | OPERADORA AEREO | Mexico | ||
| OPV | Operadora de Veulos Ejectutivos | OPERADORA DE VUELOS | Mexico | ||
| LLO | Operation Enduring Freedom | APOLLO | Canada | ||
| OAX | Operational Aviation Services | Australia | |||
| ORD | Orange Air Services | ORANGE SERVICES | Sierra Leone | ||
| ORJ | Orange Air Sierra Leone | ORANGE SIERRA | Sierra Leone | ||
| ORE | Orange Aviation | ORANGE AVIATION | Israel | ||
| ORX | Orbit Express Airlines | OREX | Turkey | ||
| ORK | Orca Air | ORCA TAXI | Egypt | ||
| BUE | Orebro Aviation | BLUELIGHT | Sweden | ||
| ORM | Orel State Air Enterprise | ORPRISE | Russia | ||
| R2 | ORB | Orenburg Airlines | ORENBURG | Russia | |
| OTA | Organizacion De Transportes Aéreos | ORGANIZACION | Mexico | ||
| OML | Organizacoes Mambra | MAMBRA | Angola | ||
| OVV | Orient Air | ORIENTSYR | Syrian Arab Republic | ||
| OTR | Orient Airlines | ORIENTROC | Sudan | ||
| ORN | Orient Airways | ORIENT LINER | Pakistan | ||
| OX | OEA | Orient Thai Airlines | ORIENT THAI | Thailand | |
| NGK | Oriental Air Bridge | ORIENTAL BRIDGE | Japan | ||
| OAC | Oriental Airlines | ORIENTAL AIR | Nigeria | ||
| QO | OGN | Origin Pacific Airways | ORIGIN | New Zealand | |
| OED | Orion Air Charter | ORION CHARTER | South Africa | ||
| OIX | Orion-x | ORIONIX | Russia | ||
| KOV | Orlan-2000 | ORLAN | Kazakhstan | ||
| RNG | Orange Aircraft Leasing | ORANGE | Netherlands | ||
| OAD | Orscom Tourist Installations Company | ORSCOM | Egypt | ||
| JPA | OSACOM | J-PAT | United States | United States Army | |
| OSH | Osh Avia | OSH AVIA | Kyrgyzstan | ||
| OCO | Ostend Air College | AIR COLLEGE | Belgium | ||
| ODY | Odyssey International | ODYSSEY | Canada | ||
| FNL | Oulun Tilauslento | FINN FLIGHT | Finland | ||
| ON | RON | Our Airline | OUR AIRLINE | Nauru | formerly Air Nauru |
| OOT | Out Of The Blue Air Safaris | OOTBAS | South Africa | ||
| OJ | OLA | Overland Airways | OVERLAND | Nigeria | |
| OAR | ONE AIR | BOSS AIR | Spain | ||
| OXE | Oxaero | OXOE | United Kingdom | ||
| WDK | Oxford Air Services | WOODSTOCK | United Kingdom | ||
| OAA | Oxley Aviation | Australia | |||
| OZ | OZR | Ozark Air Lines | OZARK | United States | Defunct |
| O7 | OZJ | OzJet | AUSJET | Australia | |
| OSU | Ohio State University | SCARLET | United States | ||
| OA | OAL | Olympic Airlines | OLYMPIC | Greece | Defunct |
| OB | AAN | Oasis International Airlines Now assigned to Boliviana de Aviacion (BoA) | OASIS | Spain | Ceased operations |
| ORT | Ortac | SKYWALKER | Jersey | ||
| PIP | Pilot Flight Academy | PILOT | Norway | ||
| HRS | Pursuit Aviation | HORSEMAN | United States | 2016 [47] | |
| NCT | Pete Air | PETE AIR | Thailand | 2014 [48] | |
| PRT | Prime Service Italia | PRIME ITALIA | Italy | 2014 [48] | |
| PXT | Pacific Coast Jet | PACK COAST | United States | Allocated in 2014 [49] | |
| BPH | Phoenix Helicopter Academy | BLACK PHOENIX | United Kingdom | ||
| PFY | Pel-Air Aviation | PELFLIGHT | Australia | ||
| PXR | Pixair Survey | PIXAIR | France | ||
| PNC | Prince Aviation | PRINCE | Serbia | ||
| PMI | Primero Transportes Aereos | AEROEPRIM | Mexico | ||
| KTL | P & P Floss Pick Manufacturers | KNOTTSBERRY | South Africa | ||
| PCR | PAC Air | PACAIR | United States | Pearson Aviation Corporation | |
| PV | PNR | PAN Air | SKYJET | Spain | |
| 9Q | PBA | PB Air | PEEBEE AIR | Thailand | |
| PDQ | PDQ Air Charter | DISPATCH | United States | ||
| XAS | PHH Aviation System | United States | |||
| PDG | PLM Dollar Group | OSPREY | United Kingdom | ||
| PU | PUA | PLUNA | PLUNA | Uruguay | |
| U4 | PMT | PMTair | MULTITRADE | Cambodia | Progress Multitrade |
| PRP | PRT Aviation | PRONTO | Spain | ||
| OH | JIA | PSA Airlines | BLUE STREAK | United States | part of American Airlines Group |
| KST | PTL Luftfahrtunternehmen | KING STAR | Germany | ||
| WIS | Paccair | WISCAIR | United States | ||
| Y5 | PCE | Pace Airlines | PACE | United States | Pace Airlines as purchased by Hooters in December 2002. |
| PAB | Pacific Air Boats | AIR BOATS | Canada | ||
| PRC | Pacific Air Charter | PACIFIC CHARTER | United States | ||
| PAQ | Pacific Air Express | SOLPAC | Solomon Islands | Registered Solomon Islands, main base in Brisbane, Australia | |
| PXP | Pacific Air Transport | PAK EXPRESS | United States | ||
| BL | PIC | Pacific Airlines | PACIFIC AIRLINES | Vietnam | |
| PAK | Pacific Alaska Airlines | PACIFIC ALASKA | United States | ||
| PCV | Pacific Aviation (Australia) | PACAV | Australia | ||
| PTO | European Flight Academy / Lufthansa Aviation Training | ROOKIE | Germany | ||
| PCX | Pacific Aviation (United States) | United States | |||
| DJ | PBN | Pacific Blue | BLUEBIRD | New Zealand | Controlled Dupe IATA with Virgin Australia |
| PQA | Pacific Coast Airlines | SAGE BRUSH | United States | ||
| 8P | PCO | Pacific Coastal Airlines | PASCO | Canada | |
| Q8 | PEC | Pacific East Asia Cargo Airlines | PAC-EAST CARGO | Philippines | |
| PFA | Pacific Flight Services | PACIFIC SING | Singapore | ||
| PIN | Pacific International Airlines | ROAD RUNNERS | United States | ||
| PSA | Pacific Island Aviation | PACIFIC ISLE | United States | ||
| PCJ | Pacific Jet | PACIFIC JET | United States | ||
| PPM | Pacific Pearl Airways | PACIFIC PEARL | Philippines | ||
| PAR | Pacific Rim Airways | PACRIM | Australia | ||
| LW | NMI | Pacific Wings | TSUNAMI | United States | |
| GX | Pacificair | Philippines | |||
| PFR | Pacificair Airlines | PACIFIC WEST | United States | ||
| RCY | Package Express | RACE CITY | United States | ||
| PAE | Paisajes Españoles | PAISAJES | Spain | ||
| PKW | Pak West Airlines | PLATINUM WEST | United States | ||
| PK | PIA | Pakistan International Airlines | PAKISTAN | Pakistan | |
| PKR | Pakker Avio | PAKKER AVIO | Estonia | ||
| LPA | Pal Aerolíneas | LINEASPAL | Mexico | ||
| PPC | Palau Asia Pacific Airlines | PALAU ASIAPAC | Palau | ||
| PNA | Palau National Airlines | SEBUS | Palau | 2014 [48] | |
| GP | PTP | Palau Trans Pacific Airlines | TRANS PACIFIC | Palau | |
| PF | PNW | Palestinian Airlines | PALESTINIAN | Egypt | |
| JSP | Palmer Aviation | PALMER | United Kingdom | ||
| NR | PIR | Pamir Airways | PAMIR | Afghanistan | |
| PFN | Pan African Air Services | PANAFRICAN | Sierra Leone | ||
| ODM | Pan African Airways | Kenya | |||
| PAX | Pan Air | PANNEX | United States | ||
| XPA | Pan Am Weather Systems | United States | |||
| 7N | PWD | PAWA Dominicana | Dominican Republic | ||
| PN | Pan American Airways | United States | defunct | ||
| PA | PAA | Pan American Airways | United States | defunct | |
| PA | PAA | Pan American World Airways | CLIPPER | United States | defunct 1991 |
| PEA | Pan Europeenne Air Service | France | |||
| PHT | Pan Havacilik Ve Ticaret | PANANK | Turkey | ||
| PMA | Pan Malaysian Air Transport | PAN MALAYSIA | Malaysia | ||
| PNC | Pan-Air | PANAIRSA | Mexico | ||
| PNF | Panafrican Airways | PANWAYS | Ivory Coast | defunct | |
| PGI | Panagra Airways | PANAGRA | United States | ||
| RSL | Panama Aircraft Rental and Sales | PANAMA RENTAL | Panama | 2014 [48] | |
| PEI | Panamedia | PANAMEDIA | Spain | ||
| PVI | Panavia | Panama | |||
| PNH | Panh | KUBAN LIK | Russia | ||
| PHU | Pannon Air Service | PANNON | Hungary | ||
| PNM | Panorama | PANORAMA | Spain | ||
| PAH | Panorama Air Tour | LANI | United States | ||
| AFD | Panorama Flight Service | AIRFED | United States | ||
| P8 | PTN | Pantanal Linhas Aéreas | PANTANAL | Brazil | |
| HMP | Papair Terminal | PAPAIR TERMINAL | Haiti | ||
| PAI | Paradise Airways | SEA RAY | United States | ||
| PDI | Paradise Island Airways | PARADISE ISLAND | United States | ||
| PGX | Paragon Air Express | PARAGON EXPRESS | United States | ||
| PGF | Paragon Global Flight Support | United Kingdom | |||
| PRR | Paramount Airlines | PARAMOUNT | Sierra Leone | ||
| I7 | PMW | Paramount Airways | PARAWAY | India | |
| APE | Parcel Express | AIR PARCEL | United States | ||
| IRE | Pariz Air | PARIZAIR | Iran | ||
| PRA | Pars Aviation Service | PARSAVIA | Iran | ||
| PST | Parsa | TURISMO REGIONAL | Panama | ||
| FAP | Parsons Airways Northern | Canada | |||
| PSC | Pascan Aviation | PASCAN | Canada | ||
| P3 | PTB | Passaredo Transportes Aéreos | PASSAREDO | Brazil | |
| PTC | Patria Cargas Aéreas | PATRIA | Argentina | ||
| BYT | Patriot Aviation Limited | BYTE | United Kingdom | ||
| ETL | Patterson Aviation Company | ENTEL | United States | ||
| PHE | Pawan Hans | PAWAN HANS | India | ||
| IRP | Payam Air | PAYAMAIR | Iran | Air Center Service | |
| KGC | Peach Air | GOLDCREST | United Kingdom | ||
| PRL | Pearl Air | PEARL LINE | Pakistan | ||
| PBY | Pearl Air Services | PEARL SERVICES | Uganda | ||
| HP | HPA | Pearl Airways | PEARL AIRWAYS | Haiti | IATA code withdrawn |
| PVU | Peau Vavaʻu | PEAU | Tonga | ||
| PXA | Pecotox Air | PECOTOX | Moldova | ||
| PC | PGT | Pegasus Airlines | SUNTURK | Turkey | WAS 1I, H9 |
| PE | PEV | People's | PEOPLES | Austria | Previously used by Pegaviation, and PeopleExpress (US low cost carrier 1981-87) |
| 1I | Pegasus Hava Tasimaciligi | Sunturk | Turkey | ||
| HAK | Pegasus Helicopters | HELIFALCON | Norway | ||
| Pelican Air Services | PELICAN AIRWAYS | South Africa | |||
| PEX | Pelican Express | PELICAN EXPRESS | United States | ||
| PAS | Pelita Air Service | PELITA | Indonesia | ||
| PEM | Pem-Air | PEM-AIR | Canada | ||
| PDY | Pen-Avia | PENDLEY | United Kingdom | ||
| KS | PEN | Peninsula Airways | PENINSULA | United States | |
| PNE | Peninter Aérea | PENINTER | Mexico | ||
| PCA | Penya De L'Aire | PENA DEL AIRE | Spain | ||
| CVT | Peran | CVETA | Kazakhstan | ||
| PCC | Perforadora Central | PERFORADORA CENTRAL | Mexico | ||
| PAG | Perimeter Aviation | PERIMETER | Canada | ||
| P9 | PGP | Perm Airlines | PERM AIR | Russia | |
| PPQ | Personas Y Pasquetes Por Air | PERSONSPAQ | Mexico | ||
| P9 | PVN | Peruvian Airlines | Peru | ||
| FPR | Peruvian Air Force | Peru | Fuerza Aérea Del Perú | ||
| INP | Peruvian Navy | Peru | |||
| PEO | Petro Air | PETRO AIR | Libya | ||
| PMX | Petroleos Mexicanos | PEMEX | Mexico | ||
| PHM | Petroleum Helicopters | PETROLEUM | United States | ||
| PHC | Petroleum Helicopters de Colombia | HELICOPTERS | Colombia | ||
| PTK | Petropavlovsk-Kamchatsk Air Enterprise | PETROKAM | Russia | ||
| PTY | Petty Transport | PETTY | United States | ||
| PHV | Phenix Aviation | NEW BIRD | France | ||
| PMY | Phetchabun Airline | PHETCHABUN AIR | Thailand | ||
| Z2 | EZD | Philippines AirAsia | REDHOT | Philippines | |
| PR | PAL | Philippine Airlines | PHILIPPINE | Philippines | |
| PHI | Philips Aviation Services | PHILAIR | Netherlands | ICAO code and call sign no longer allocated | |
| BCH | Phillips Air | BEACHBALL | United States | ||
| PDD | Phillips Alaska | PADA | United States | ||
| PHL | Phillips Michigan City Flying Service | PHILLIPS | United States | ||
| PHB | Phoebus Apollo Aviation | PHOEBUS | South Africa | ||
| KZM | Phoebus Apolloa Zambia | CARZAM | Zambia | ||
| PHA | Phoenix Air Group | GRAY BIRD | United States | ||
| PHN | Phoenix Air Lines | PHOENIX BRASIL | Brazil | ||
| PAM | Phoenix Air | PHOENIX | Germany | ||
| PPG | Phoenix Air Transport | PAPAGO | United States | ||
| WDY | Phoenix Airline Services | WINDYCITY | United States | ||
| HP | Phoenix Airways | Switzerland | |||
| PHY | Phoenix Avia | PHOENIX ARMENIA | Armenia | ||
| PHG | Phoenix Aviation | PHOENIX GROUP | Kyrgyzstan | ||
| XPX | Phoenix Flight Operations | United States | |||
| 9R | VAP | Phuket Air | PHUKET AIR | Thailand | |
| PI | PAI | Piedmont Airlines (1948-1989) | PIEDMONT | United States | defunct |
| PDT | Piedmont Airlines | PIEDMONT | United States | part of American Airlines Group | |
| PCH | Pilatus Flugzeugwerke | PILATUS WINGS | Switzerland | ||
| PLU | Pilatus PC-12 Center De Mexico | PILATUS MEXICO | Mexico | ||
| MKS | Pimichikamac Air | MIKISEW | Canada | ||
| PNP | Pineapple Air | PINEAPPLE AIR | Bahamas | ||
| PIM | Pinframat | PINFRAMAT | Angola | ||
| PCL | Pinnacle Air Group | PINNACLE GROUP | United States | ||
| 9E | FLG | Pinnacle Airlines | FLAGSHIP | United States | |
| PIO | Pioneer Airlines | PIONEER | United States | ||
| PER | Pioneers Limited | Pakistan | |||
| PRN | Pirinair Express | PRINAIR EXPRESS | Spain | ||
| PLN | Planar | PLANAR | Angola | ||
| PMS | Planemaster Services | PLANEMASTER | United States | ||
| PLZ | Planet Airways | PLANET | United States | ||
| OG | FPY | Play | PLAYER | Iceland | [50] |
| PYZ | Players Air | PLAYERS AIR | United States | ||
| LIB | Polizeihubschrauberstaffel Hamburg | LIBELLE | Germany | ||
| PSF | Plymouth School of Flying | LIZARD | United Kingdom | ||
| DP | PBD | Pobeda | POBEDA | Russia | |
| POC | Pocono Air Lines | POCONO | United States | ||
| PDA | Podilia-Avia | PODILIA | Ukraine | ||
| PAZ | Point Afrique Niger | POINTAIR NIGER | Niger | ||
| RMI | Point Airlines | POINT AIRLINE | Nigeria | ||
| PAW | Pointair Burkina | POINTAIR BURKINA | Burkina Faso | ||
| PTS | Points of Call Airlines | POINTSCALL | Canada | ||
| PO | PAC | Polar Air Cargo | POLAR | United States | |
| PMO | Polar Airlines de Mexico | POLAR MEXICO | Mexico | ||
| PSR | Polestar Aviation | POLESTAR | United Kingdom | ||
| POT | Polet Airlines | POLET | Russia | ||
| POF | Police Aux Frontières | AIRPOL | France | ||
| PLC | Police Aviation Services | SPECIAL | United Kingdom | ||
| PLF | Polish Air Force | POLISH AIRFORCE | Poland | ||
| PNY | Polish Navy | POLISH NAVY | Poland | ||
| NRW | Polizeifliegerstaffel Nordrhein-Westfalen | HUMMEL | Germany | ||
| PPH | Polizeihubschrauberstaffel Niedersachsen | POLICE PHOENIX | Germany | ||
| PIK | Polizeihubschrauberstaffel Sachsen-Anhalt | POLICE IKARUS | Germany | ||
| SRP | Polizeihubschauberstaffel Rheinland-Pfalz | SPERBER | Germany | ||
| PBW | Polizeihubschrauberstaffel Baden-Württemberg | BUSSARD | Germany | ||
| EDL | Polizeihubschrauberstaffel Bayern | POLICE EDELWEISS | Germany | ||
| PBB | Polizeihubschrauberstaffel Brandenburg | ADEBAR | Germany | ||
| PHH | Polizeihubschrauberstaffel Hessen | IBIS | Germany | ||
| PMV | Polizeihubschrauberstaffel Mecklenburg-Vorpommern | POLICE MERLIN | Germany | ||
| PHS | Polizeihubschrauberstaffel Sachsen | PASSAT | Germany | ||
| HBT | Polizeihubschrauberstaffel Thüringen | HABICHT | Germany | ||
| CUK | Polo Aviation | CHUKKA | United Kingdom | ||
| PLA | Polynesian Air-Ways | POLYAIR | United States | ||
| PH | PAO | Polynesian Airlines | POLYNESIAN | Samoa | |
| DJ | PLB | Polynesian Blue | POLYBLUE | New Zealand | Controlled Dupe IATA, Code reserved but not in use, PBN (Bluebird) used. |
| 1U | Polyot Sirena | Russia | |||
| PND | Pond Air Express | POND AIR | United States | ||
| PSI | Pont International Airline Services | PONT | Suriname | defunct | |
| PLX | Pool Aviation | POOLEX | United Kingdom | ||
| PTQ | Port Townsend Airways | TOWNSEND | United States | ||
| POR | Porteadora De Cosola | PORTEADORA | Mexico | ||
| PD | POE | Porter Airlines | PORTER | Canada | |
| NI | PGA | Portugalia | PORTUGALIA | Portugal | |
| AFP | Portuguese Air Force | PORTUGUESE AIR FORCE | Portugal | ||
| POA | Portuguese Army | PORTUGUESE ARMY | Portugal | ||
| PON | Portuguese Navy | PORTUGUESE NAVY | Portugal | ||
| M4 | MSA | Poste Air Cargo | AIRMERCI | Italy | |
| BK | PDC | Potomac Air | DISTRICT | United States | |
| PSN | Potosina Del Aire | POTOSINA | Mexico | ||
| PWL | Powell Air | POWELL AIR | Canada | ||
| PFS | Prairie Flying Service | PRAIRIE | United States | ||
| PWC | Pratt and Whitney Canada | PRATT | Canada | ||
| PW | PRF | Precision Air | PRECISION AIR | Tanzania | |
| PRE | Precision Airlines | PRECISION | United States | ||
| BAT | Premiair | BALLISTIC | Luxembourg | ||
| PGL | Premiair Aviation Services | PREMIERE | United Kingdom | ||
| PME | Premiair Flying Club | ADUR | United Kingdom | ||
| EMI | Premium Air Shuttle | BLUE SHUTTLE | Nigeria | ||
| PMU | Premium Aviation | PREMIUM | Germany | ||
| BFA | Presidence Du Faso | Burkina Faso | |||
| ONM | Presidencia de La Republica de Guinea Ecuatorial | Equatorial Guinea | |||
| TO | PSD | President Airlines | Cambodia | ||
| MO | AUH | Presidential Flight | SULTAN | United Arab Emirates | Presidential flight |
| PRD | Presidential Aviation | PRESIDENTIAL | United States | ||
| PWA | Priester Aviation | PRIESTER | United States | ||
| PMM | Paradigm Air Operators | PARADIGM | United States | ||
| FE | WCP | Primaris Airlines | WHITECAP | United States | |
| PMC | Primas Courier | PRIMAC | United States | ||
| CRY | Primavia Limited | CARRIERS | United Kingdom | ||
| PRM | Prime Airlines | PRIME AIR | United States | ||
| PKZ | Prime Aviation | PRAVI | Kazakhstan | ||
| CME | Prince Edward Air | COMET | Canada | ||
| PJP | Princely Jets | PRINCELY JETS | Pakistan | ||
| 8Q | Princess Air | no longer assigned | |||
| PCN | Princeton Aviation Corporation | PRINCETON | United States | ||
| PRY | Priority Air Charter | PRIORITY AIR | United States | ||
| PAT | Priority Air Transport | PAT | United States | Department of the Army | |
| BCK | Priority Aviation Company | BANKCHECK | United States | ||
| PTI | Privatair | PRIVATAIR | Switzerland | ||
| PJE | Private Jet Expeditions | PEE JAY | United States | ||
| PJA | Private Jet Management | PRIVATE FLIGHT | United States | ||
| 8W | PWF | Private Wings Flugcharter | PRIVATE WINGS | Germany | |
| P6 | PVG | Privilege Style Líneas Aéreas | PRIVILEGE | Spain | |
| PRH | Pro Air | PROHAWK | United States | ||
| PSZ | Pro Air Service | POP-AIR | United States | ||
| GIY | Probiz Guinee | PROBIZ | Guinea | ||
| PAD | Professional Express Courier Service | AIR PROFESSIONAL | United States | ||
| PVL | Professione VOlare | VOLARE | Italy | ||
| P0 | PFZ | Proflight Zambia | PROFLIGHT-ZAMBIA | Zambia | |
| PTT | Promotora Industria Totolapa | TOTOLAPA | Mexico | ||
| PRO | Propair | PROPAIR | Canada | ||
| PPA | Propheter Aviation | AIR PROP | United States | ||
| PTH | Proteus Helicopteres | PROTEUS | France | ||
| PTL | Providence Airline | PLANTATION | United States | ||
| AWD | Providence Aviation Services | Pakistan | |||
| PB | SPR | Provincial Airlines | SPEEDAIR | Canada | |
| PRV | Provincial Express | PROVINCIAL | Canada | ||
| PSW | Pskovavia | PSKOVAVIA | Russia | ||
| UDA | Psudiklat Perhubungan Udara/PLP | UDARA | Indonesia | ||
| PTA | Ptarmigan Airways | PTARMIGAN | Canada | ||
| PSP | Publiservicios Aéreos | PUBLISERVICIOS | Mexico | ||
| PUV | Publivoo | PUBLIVOO | Portugal | Publicidade e Imagens Aéreas | |
| PNG | Puerto Rico National Guard | United States | |||
| TXV | Puerto Vallarta Taxi Aéreo | TAXIVALLARTA | Mexico | ||
| PGH | Pulkovo Aircraft Services | Russia | |||
| PLY | Puma Linhas Aéreas | PUMA BRASIL | Brazil | ||
| PTV | Puntavia Air Services | PUNTAVIA | Djibouti | ||
| MGO | Punto Fa | MANGO | Spain | ||
| PYR | Pyramid Air Lines | PYAIR | Egypt | ||
| FV | PLK | Pulkovo Aviation Enterprise | PULKOVO | Russia | defunct merged into Rossiya (airline) |
| PRI | Primera Air Scandinavia | PRIMERA | Denmark | ||
| PRW | Primera Air Nordic | JETBIRD | Latvia | ||
| FQA | Quikjet Airlines | QUIK LIFT | India | 2014 [51] | |
| QQE | Qatar Executive | Qatar | |||
| QNT | Qanot Sharq | QANAT SHARQ | Uzbekistan | ||
| QF | QFA | Qantas | QANTAS | Australia | |
| QF | QLK | QantasLink | QLINK | Australia | Turbo-Props |
| QF | QJE | QantasLink | QJET | Australia | Qantaslink Jet Operations |
| QAC | Qatar Air Cargo | QATAR CARGO | Qatar | ||
| QR | QTR | Qatar Airways | QATARI | Qatar | |
| QAF | Qatar Amiri Flight | AMIRI | Qatar | ||
| QB | QSM | Qeshm Air | QESHM AIR | Iran | |
| QW | QDA | Qingdao Airlines | SKY LEGEND | China | |
| QTX | Quantex Environmental | AIR QUANTEX | Canada | ||
| QUE | Quebec Government Air Service | QUEBEC | Canada | ||
| QNA | Queen Air | QUEEN AIR | Dominican Republic | ||
| LBQ | Quest Diagnostics | LABQUEST | United States | ||
| QAJ | Quick Air Jet Charter | DAGOBERT | Germany | ||
| QAH | Quick Airways Holland | QUICK | Netherlands | ||
| QAS | Quisqueya Airlines | QUISQUEYA | Haiti | ||
| QAQ | Qurinea Air Service | QURINEA AIR | Libya | ||
| QCC | Qwest Commuter Corporation | QWEST AIR | United States | ||
| QWA | Qwestair | Australia | |||
| QWL | Qwila Air | Q-CHARTER | South Africa | ||
| RBB | Rabbit-Air | RABBIT | Switzerland | ||
| ACE | Race Cargo Airlines | Fastcargo | Ghana | defunct | |
| R6 | RACSA | Guatemala | |||
| GBR | Rader Aviation | GREENBRIER AIR | United States | ||
| 1D | Radixx | United States | |||
| BKH | RAF Barkston Heath | United Kingdom | |||
| CFN | RAF Church Fenton | CHURCH FENTON | United Kingdom | Church Fenton Flying Training Unit | |
| COH | RAF Coltishall | COLT | United Kingdom | Coltishall Flying Training Unit | |
| CBY | RAF Coningsby | TYPHOON | United Kingdom | Coningsby Flying Training Unit | |
| COT | RAF Cottesmore | COTTESMORE | United Kingdom | Royal Air Force (Cottesmore Flying Training Unit) - No longer allocated | |
| CWL | RAF Cranwell | CRANWELL | United Kingdom | Royal Air Force (Cranwell Flying Training Unit) | |
| KIN | RAF Kinloss | KINLOSS | United Kingdom | Royal Air Force (Kinloss Flying Training Unit) | |
| LEE | RAF Leeming | JAVELIN | United Kingdom | Royal Air Force (Leeming Flying Training Unit) | |
| LCS | RAF Leuchars | LEUCHARS | United Kingdom | Royal Air Force | |
| LOP | RAF Linton-on-Ouse | LINTON ON OUSE | United Kingdom | Royal Air Force (Linton-on-Ouse Flying Training Unit) | |
| LOS | RAF Lossiemouth | LOSSIE | United Kingdom | Royal Air Force (Lossiemouth Flying Training Unit) | |
| MRH | RAF Marham | MARHAM | United Kingdom | Royal Air Force (Marham Flying Training Unit) | |
| NWO | RAF Northwood | United Kingdom | Royal Air Force (Northwood Headquarters) | ||
| SMZ | RAF Scampton | SCAMPTON | United Kingdom | Royal Air Force | |
| STN | RAF St Athan | SAINT ATHAN | United Kingdom | Royal Air Force | |
| SMG | RAF St Mawgan Search and Rescue | United Kingdom | Royal Air Force | ||
| TOF | RAF Topcliffe Flying Training Unit | TOPCLIFFE | United Kingdom | Royal Air Force | |
| VYT | RAF Valley Flying Training Unit | ANGLESEY | United Kingdom | Royal Air Force | |
| VLL | RAF Valley SAR Training Unit | United Kingdom | Royal Air Force | ||
| WAD | RAF Waddington | VULCAN | United Kingdom | Royal Air Force (Waddington FTU) | |
| WIT | RAF Wittering | STRIKER | United Kingdom | Royal Air Force (Wittering FTU) | |
| MTL | RAF-Avia | MITAVIA | Latvia | ||
| WES | Rainbow International Airlines | WEST INDIAN | United States | ||
| RJT | RA Jet Aeroservicios | RA JET | Mexico | ||
| RAJ | Raji Airlines | RAJI | Pakistan | ||
| RKM | RAK Airways | RAKAIR | United Arab Emirates | ||
| RFA | Raleigh Flying Service | RALEIGH SERVICE | United States | ||
| REX | Ram Air Freight | RAM EXPRESS | United States | ||
| RMT | Ram Aircraft Corporation | RAM FLIGHT | United States | ||
| PPK | Ramp 66 | PELICAN | United States | ||
| RGM | Rangemile Limited | RANGEMILE | United Kingdom | ||
| MWR | Raslan Air Service | RASLAN | Egypt | ||
| RAQ | Rath Aviation | RATH AVIATION | Austria | ||
| CSM | Ratkhan Air | LORRY | Kazakhstan | ||
| RVR | Raven Air | RAVEN | United Kingdom | ||
| RVN | Raven Air | RAVEN U-S | United States | Qualiflight Training | |
| 7H | RVF | Ravn Alaska | RAVEN FLIGHT | United States | 2014 [52] |
| REI | Ray Aviation | RAY AVIATION | Israel | ||
| RYT | Raya Jet | Jordan | |||
| RTN | Raytheon Aircraft Company | RAYTHEON | United States | ||
| RCJ | Raytheon Corporate Jets | NEWPIN | United Kingdom | ||
| KSS | Raytheon Travel Air | KANSAS | United States | ||
| RCB | Real Aero Club De Baleares | BALEARES | Spain | ||
| CDT | Real Aero Club de Reus-Costa Dorado | AEROREUS | Spain | ||
| RCD | Real Aeroclub De Tenerife | AEROCLUB | Spain | ||
| VCB | Real Aero Club de Vizcaya | Spain | |||
| RLV | Real Aviation | REAL | Ghana | ||
| XW | LUV | Really Cool Airlines | REALLY COOL AIRLINE | Thailand | |
| RCB | Real Aero Club De Baleares | BALEARES | Spain | ||
| REB | Rebus | REBUS | Bulgaria | ||
| RTO | Rectimo Air Transports | RACCOON | France | ||
| RIX | Rectrix Aviation | RECTRIX | United States | ||
| PSH | Red Aviation | PASSION | United Kingdom | (Helidrome Limited) | |
| RBN | Red Baron Aviation | RED BARON | United States | ||
| DEV | Red Devils Parachute Display Team | RED DEVILS | United Kingdom | ||
| RDV | Red Sea Aviation | RED AVIATION | Egypt | ||
| RSV | Red Sky Ventures | RED SKY | Namibia | ||
| STR | Red Star | STARLINE | United Arab Emirates | ||
| 8L | RHC | Redhill Aviation | REDAIR | United Kingdom | |
| VRD | Virgin America | REDWOOD | United States | ||
| RAV | Reed Aviation | REED AVIATION | United Kingdom | ||
| REF | Reef Air | REEF AIR | New Zealand | ||
| V4 | REK | Reem Air | REEM AIR | Kyrgyzstan | |
| RVV | Reeve Aleutian Airways | REEVE | United States | defunct | |
| RBH | Regal Bahamas International Airways | CALYPSO | Bahamas | ||
| RGY | Regency Airlines | REGENCY | United States | ||
| RAH | Regent Air | REGENT | Canada | ||
| RX | RGE | Regent Airways | REGENT | Bangladesh | defunct; code reassigned to Riyadh Air |
| RAG | Regio Air | GERMAN LINK | Germany | ||
| RGR | Region Air | REGIONAIR | Canada | ||
| YS | RAE | Régional | REGIONAL EUROPE | France | |
| TSH | R1 Airlines, previously Regional 1 | TRANSCANADA | Canada | ||
| RIL | Regional Air | Mauritania | |||
| REW | Regional Air Express | REGIONAL WINGS | Germany | ||
| REG | Regional Air Services | REGIONAL SERVICES | Tanzania | ||
| FN | RGL | Regional Air Lines | MAROC REGIONAL | Morocco | |
| ZL | RXA | Regional Express | REX | Australia | |
| JJM | Regional Geodata Air | GEODATA | Spain | ||
| P7 | REP | Regional Paraguaya | REGIOPAR | Paraguay | Defunct |
| 3C | CEA | RegionsAir | CORP-X | United States | formerly Corporate Airlines |
| REL | Reliance Aviation | RELIANCE AIR | United States | ||
| RLI | Reliant Air | RELIANT | United States | ||
| RTS | Relief Transport Services | RELIEF | United Kingdom | ||
| RAN | Renan | RENAN | Moldova | ||
| ROA | Reno Air | RENO AIR | United States | defunct | |
| RGS | Renown Aviation | RENOWN | United States | ||
| RC | REP | Republic Airlines | REPUBLIC | United States | defunct; 1979–1986, merged with Northwest Airlines |
| RW | RPA | Republic Airways | BRICKYARD | United States | |
| RH | RPH | Republic Express Airlines | PUBLIC EXPRESS | Indonesia | |
| RBC | Republicair | REPUBLICAIR | Mexico | ||
| RST | Resort Air | RESORT AIR | United States | ||
| RUT | Reut Airways | YADID | Israel | ||
| RGV | RG Aviation | Venezuela | 2014 [52] | ||
| RDS | Rhoades Aviation | RHOADES EXPRESS | United States | ||
| RIU | Riau Airlines | RIAU AIR | Indonesia | ||
| RIA | Rich International Airways | RICHAIR | United States | ||
| RVC | Richards Aviation | RIVER CITY | United States | ||
| RIC | Richardson's Airway | RICHARDSON | United States | ||
| RCA | Richland Aviation | RICHLAND | United States | ||
| WHH | Richy Skylark | Sri Lanka | 2014 [52] | ||
| HPR | Rick Lucas Helicopters | HELIPRO | New Zealand | ||
| C7 | RLE | Rico Linhas Aéreas | RICO | Brazil | |
| RID | Ridder Avia | AKRID | Kazakhstan | ||
| RAK | Riga Airclub | SPORT CLUB | Latvia | ||
| RAZ | Rijnmond Air Services | RIJNMOND | Netherlands | ||
| POL | Rikspolisstyrelsen | Sweden | |||
| RIM | Rimrock Airlines | RIMROCK | United States | ||
| SKA | Rio Air Express | RIO EXPRESS | Brazil | ||
| REO | Rio Airways | RIO | United States | ||
| E2 | GRN | Rio Grande Air | GRANDE | United States | defunct |
| RL | RIO | Rio Linhas Aéreas | RIO | Brazil | |
| SL | RSL | Rio Sul Serviços Aéreos Regionais | RIO SUL | Brazil | defunct |
| RVM | River Ministries Air Charter | RIVER | South Africa | ||
| RGP | River State Government of Nigeria | GARDEN CITY | Nigeria | ||
| UNR | Rivne Universal Avia | RIVNE UNIVERSAL | Ukraine | ||
| RX | RXI | Riyadh Air | RIYADH AIR | Saudi Arabia | Launching in 2025 |
| RDL | Roadair Lines | ROADAIR | Canada | ||
| RBT | Robinton Aero | ROBIN | Dominican Republic | ||
| V2 | RBY | Vision Airlines | RUBY | United States | Charter Airline and Las Vegas Tours |
| ROX | Roblex Aviation | ROBLEX | United States | ||
| RKW | Rockwell Collins Avionics | ROCKWELL | United States | ||
| ROC | Rocky Mountain Airlines | Canada | |||
| RMA | Rocky Mountain Airways | ROCKY MOUNTAIN | United States | ||
| LIF | Rocky Mountain Holdings | LIFECARE | United States | ||
| RDZ | Rodze Air | RODZE AIR | Nigeria | ||
| FAD | Rog-Air | AIR FRONTIER | Canada | ||
| RRZ | Rollright Aviation | ROLLRIGHT | United Kingdom | ||
| RRL | Rolls-Royce Limited | MERLIN | United Kingdom | Military Aviation | |
| BTU | Rolls-Royce plc | ROLLS | United Kingdom | Rolls-Royce Bristol Engine Division | |
| ROF | Romanian Air Force | ROMAF | Romania | ||
| RMV | Romavia | AEROMAVIA | Romania | ||
| RNS | Ronso | RONSO | Mexico | ||
| ROR | Roraima Airways | RORAIMA | Guyana | ||
| KRS | Rosen Aviation | Japan | 2014 [52] | ||
| RNB | Rosneft-Baltika | ROSBALT | Russia | ||
| NRG | Ross Aviation | ENERGY | United States | ||
| RFS | Rossair | Australia | |||
| RSS | Rossair | ROSS CHARTER | South Africa | ||
| ROS | Rossair Europe | CATCHER | Netherlands | ||
| FV | SDM | Rossiya | RUSSIA | Russia | Airline merged with Pulkovo Aviation Enterprise and renamed to Rossiya |
| RAL | Roswell Airlines | ROSWELL | United States | ||
| GZ | RAR | Air Rarotonga | AIR RAROTONGA | Cook Islands | |
| RTR | Rotatur | ROTATUR | Brazil | ||
| RKT | Rotormotion | ROCKET | United Kingdom | ||
| JCR | Rotterdam Jet Center | ROTTERDAM JETCENTER | Netherlands | ||
| ROV | Rover Airways International | ROVERAIR | United States | ||
| VOS | Rovos Air | ROVOS | South Africa | ||
| RCG | Royal Air Cargo | ROYAL CARGO | South Africa | ||
| RR | RFR | Royal Air Force | RAFAIR | United Kingdom | |
| RS | MJN | Royal Air Force of Oman | MAJAN | Oman | |
| ACW | Royal Air Force | AIR CADET | United Kingdom | Air Cadet Schools | |
| RRR | Royal Air Force | ASCOT | United Kingdom | RAF HQSTC (Air Transport) | |
| RRF | Royal Air Force | KITTY | United Kingdom | RAF positioning flights | |
| SHF | Royal Air Force | VORTEX | United Kingdom | Support Helicopter Force | |
| RAX | Royal Air Freight | AIR ROYAL | United States | ||
| AT | RAM | Royal Air Maroc | ROYALAIR MAROC | Morocco | |
| R0 | RPK | Royal Airlines | ROYAL PAKISTAN | Pakistan | |
| RLM | Royal American Airways | ROYAL AMERICAN | United States | ||
| V5 | RYL | Royal Aruban Airlines | ROYAL ARUBAN | Aruba | |
| ASY | Royal Australian Air Force | AUSSIE | Australia | Used by RAAF units internationally | |
| RXP | Royal Aviation Express | ROY EXPRESS | Canada | ||
| RYB | Royal Bahrain Airlines | ROYAL BAHRAIN | Bahrain | ||
| BI | RBA | Royal Brunei Airlines | BRUNEI | Brunei | |
| KDR | Royal Daisy Airlines | DARLINES | Uganda | ||
| RGA | Royal Ghanaian Airlines | ROYAL GHANA | Ghana | ||
| ROJ | Royal Jet | ROYALJET | United Arab Emirates | ||
| RJ | RJA | Royal Jordanian | JORDANIAN | Jordan | |
| RJZ | Royal Jordanian Air Force | JORDAN AIR FORCE | Jordan | ||
| RK | RCT | Skyview Airways | GREENSKY | THAILAND | 2014 [52] |
| RK | RKH | Royal Khmer Airlines | KHMER AIR | Cambodia | |
| RMF | Royal Malaysian Air Force | ANGKASA | Malaysia | ||
| NVY | Royal Navy | NAVY | United Kingdom | ||
| NRN | Royal Netherland Navy | NETHERLANDS NAVY | Netherlands | Koninklijke Marine | |
| NAF | Royal Netherlands Air Force | NETHERLANDS AIR FORCE | Netherlands | ||
| KIW | Royal New Zealand Air Force | KIWI | New Zealand | ||
| NOW | Royal Norwegian Air Force | NORWEGIAN | Norway | ||
| ROP | Royal Oman Police | Oman | |||
| RL | PPW | Royal Phnom Penh Airways | PHNOM-PENH AIR | Cambodia | |
| RRA | Royal Rwanda Airlines | ROYAL RWANDA | Rwanda | ||
| RSF | Royal Saudi Air Force | ARSAF | Saudi Arabia | ||
| RR | RYS | Buzz (Ryanair) | MAGIC SUN | Poland | |
| RSN | Royal Swazi National Airways | SWAZI NATIONAL | Eswatini | ||
| WR | HRH | Royal Tongan Airlines | TONGA ROYAL | Tonga | |
| RWE | Royal West Airlines | ROYAL WEST | United States | ||
| RSB | Rubystar | RUBYSTAR | Belarus | ||
| RLH | Ruili Airlines | SENDI | China | ||
| RMG | Rumugu Air & Space Nigeria | RUMUGU AIR | Nigeria | ||
| RUR | Rusaero | Russia | |||
| KLE | Rusaero | Russia | Centre for Civil Aviation Services | ||
| CGI | Rusair JSAC | CGI-RUSAIR | Russia | ||
| RUH | Rusich-T | Russia | |||
| RLU | Rusline | RUSLINE AIR | Russia | ||
| MIG | Russian Aircraft Corporation-MiG | MIG AVIA | Russia | ||
| RFF | Russian Federation Air Force | RUSSIAN AIRFORCE | Russia | ||
| P7 | ESL | Russian Sky Airlines | RADUGA | Russia | |
| RUZ | Rusuertol | ROSTUERTOL | Russia | ||
| 5R | RUC | Rutaca | RUTACA | Venezuela | |
| RND | Rutland Aviation | RUTLAND | United Kingdom | ||
| RUA | Rwanda Airlines | Rwanda | |||
| RWA | Rwanda Airways | Rwanda | |||
| WB | RWD | Rwandair Express | RWANDAIR | Rwanda | |
| RWL | RWL Luftfahrtgesellschaft | RHEINTRAINER | Germany | ||
| 7S | RYA | Ryan Air Services | RYAN AIR | United States | |
| RD | RYN | Ryan International Airlines | RYAN INTERNATIONAL | United States | defunct 2013 |
| FR | RYR | Ryanair | RYANAIR | Ireland | |
| RK | RUK | Ryanair UK | BLUEMAX | United Kingdom | |
| RYZ | Ryazan State Air Enterprise | RYAZAN AIR | Russia | ||
| RAA | Rynes Aviation | RYNES AVIATION | United States | ||
| REV | RVL Group | ENDURANCE | United Kingdom | ||
| RT | BUG | UVT Aero | Russia | ||
| OMN | Servicios Aereos Ominia | SERVIOMNIA | Mexico | 2014 [53] | |
| SEN | Servicios de Aviacion Sierra | SERVISIERRA | Mexico | 2014 [53] | |
| SGC | SGC Aviation | SAINT GEORGE | Austria | 2014 [53] | |
| SCJ | Siamjet Aviation | SIAMJET | Thailand | 2014 [53] | |
| SIX | Sixt Rent A Car | DRIVE ORANGE | United States | 2014 [53] | |
| SOG | Solenta Aviation Ghana | Ghana | 2014 [53] | ||
| QSR | SR Jet | SPARKLE ROLL | China | 2014 [53] | |
| KBN | Spiracha Aviation | KABIN | Thailand | 2014 [53] | |
| CBN | Southern Illinois University as "Aviation Flight" | CARBONDALE | United States | Allocated in 2014 [54] | |
| IBG | Springfield Air | ICE BRIDGE | United States | Allocated 2014 [55] | |
| BZQ | Seneca College | STING | Canada | Allocated 2014 [56] | |
| BVV | Sparc Avia | SPARC | Russia | ||
| SJM | Sino Jet Management | SINO SKY | China | ||
| SCH | Seychelles Airlines | OCEAN BIRD | Seychelles | ||
| BYF | San Carlos Flight Center | BAY FLIGHT | United States | ||
| SXT | Servicios de Taxi Aereos | SERTAXI | Mexico | ||
| TR | TGW | Scoot | SCOOTER | Singapore | Former IATA: TZ Former ICAO: SCO; Adopted Tigerair codes after their merger |
| IJ | SJO | Spring Airlines Japan | JEY SPRING | Japan | |
| SBD | SIBIA Aircompany Ltd | SIBIA | Russia | ||
| SHT | British Airways Shuttle | SHUTTLE | United Kingdom | ||
| 6Y | ART | Smartlynx Airlines | SMART LYNX | Latvia | |
| MYX | Smartlynx Airlines Estonia | TALLINN CAT | Estonia | ||
| QS | TVS | Smartwings | SKYTRAVEL | Czech Republic | formerly named Travel Service |
| 7O | TVL | Smartwings Hungary | TRAVEL SERVICE | Hungary | formerly named Travel Service Hungary |
| 3Z | TVP | Smartwings Poland | JETTRAVEL | Poland | formerly named Travel Service Poland |
| 6D | TVQ | Smartwings Slovakia | SLOVAKTRAVEL | Slovakia | formerly named Travel Service Slovakia |
| DES | Servicios Aereos Especializados Destina | DESTINA | Mexico | ||
| LSV | Slovenian Ministry of Defence | Slovenia | |||
| FUF | Servicios Aereos Fun Fly | SERVIFUN | Mexico | ||
| E3 | VGO | Sabaidee Airways | VIRGO | Thailand | |
| SAQ | Safe Air Company | Kenya | |||
| SMU | Sanborn Map Company | SPRINGER | United States | ||
| RBR | Siam Airnet | SIAM AIRNET | Thailand | ||
| SVB | Siavia | SIAVIA | Slovenia | ||
| MHQ | Skargardshavets Helikoptertjanst | HELICARE | Finland | ||
| BIS | Sky Bishek | JUMA AIR | Kyrgyzstan | ||
| SYH | Sky Handling | Ukraine | |||
| GG | KYE | Sky Lease Cargo | SKY CUBE | United States | |
| KPM | Sky Prim Air | SKY PRIMAIR | Molodva | ||
| BQ | SWU | Sky Alps | SKYALPS | Italy | |
| BSJ | Skybus Jet | SKYBUS JET | Bahamas | ||
| GW | SGR | SkyGreece Airlines | SKYGREECE | Greece | defunct |
| USW | Special Aviation Works | AKSAR | Uzbekistan | ||
| SH | SHA | Sharp Airlines | SHARP | Australia | Uses unregistered ICAO & IATA. |
| N9 | SHA | Shree Airlines | SHREEAIR | Nepal | |
| 7E | AWU | Sylt Air GmbH | SYLT-AIR | Germany | |
| BDS | South Asian Airlines | SOUTH ASIAN | Bangladesh | ||
| OL | SZB | Samoa Air | SAMOA | Samoa | |
| BEC | State Air Company Berkut | Kazakhstan | |||
| S4 | RZO | SATA International | AIR AZORES | Portugal | |
| SA | SAA | South African Airways | SPRINGBOK | South Africa | |
| KYD | Sky Messaging | SKYAD | South Africa | ||
| SAB | Sky Way Air | SKY WORKER | Kyrgyzstan | ||
| KV | SKV | Sky Regional Airlines | MAPLE | Canada | |
| SAC | SASCO Airlines | SASCO | Sudan | ||
| SAG | SOS Flygambulans | MEDICAL AIR | Sweden | ||
| W7 | SAH | Sayakhat Airlines | SAYAKHAT | Kazakhstan | |
| NL | SAI | Shaheen Air | SHAHEEN AIR | Pakistan | |
| MM | SAM | SAM Colombia | SAM | Colombia | Sociedad Aeronáutica De Medellín |
| SAN | Servicios Aéreos Nacionales (SAN) | AEREOS | Ecuador | defunct | |
| SAO | Sahel Aviation Service | SAVSER | Mali | ||
| ANX | Secretaria de Marina | SECRETARIA DEMARINA | Mexico | ||
| SAQ | Springbank Aviation | SPRINGBANK | Canada | ||
| SK | SAS | Scandinavian Airlines | SCANDINAVIAN | Sweden, Denmark and Norway | |
| SAV | Samal Air | Kazakhstan | |||
| SAW | Cham Wing Airlines | SHAMWING | Syrian Arab Republic | ||
| SAX | Sabah Air | SABAH AIR | Malaysia | ||
| SAY | ScotAirways | SUCKLING | United Kingdom | ||
| SAZ | Swiss Air-Ambulance | SWISS AMBULANCE | Switzerland | ||
| SBA | SOL Linhas Aéreas | SOL | Brazil | ||
| PI | SGU | Sol del Paraguay | SOLPARAGUAYO | Paraguay | |
| SBA | STA-MALI | STA-MALI | Mali | defunct | |
| SBB | Steinman Aviation | SABER EXPRESS | United States | ||
| UG | TUX | Tunisair Express | TUNEXPRESS | Tunisia | |
| SBF | Seven Bar Flying Service | SEVENAIR | Tunisia | ||
| SBG | Sabre Incorporated | United States | |||
| S7 | SBI | S7 Airlines | SIBERIAN AIRLINES | Russia | |
| SBL | Sobel Airlines of Ghana | SOBGHANA | Ghana | ||
| Q7 | SBM | SkyBahamas | SKY BAHAMAS | Bahamas | |
| SBO | Stabo Air | STABAIR | Zambia | ||
| SBQ | SmithKline Beecham Clinical Labs | SKIBBLE | United States | ||
| SBR | Saber Aviation | FREIGHTER | United States | ||
| BB | SBS | Seaborne Airlines | SEABORNE | United States | |
| PV | SBU | St Barth Commuter | BLACK FIN | France | |
| URJ | Star Air | STARAV | Pakistan | ||
| S5 | SDG | Star Air (India) | HISTAR | India | |
| JX | SJX | Starlux Airlines | STARWALKER | Taiwan | |
| SBZ | Scibe Airlift | SCIBE AIRLIFT | Democratic Republic of the Congo | ||
| AME | Spanish Air Force | AIRMIL | Spain | ||
| SCA | South Central Air | SOUTH CENTRAL | United States | ||
| SCC | Seacoast Airlines | SEA-COASTER | United States | ||
| K5 | SQH | SeaPort Airlines | SASQUATCH | United States | Former airline: Wings of Alaska now part of SeaPort Airlines. Alternative callsign: WINGS (for VFR flights only). Former ICAO code: WAK. |
| SCE | Scenic Airlines | SCENIC | United States | ||
| SCF | Socofer | SOCOFER | Angola | ||
| SCI | Servicios Aéreos San Cristóbal | SAN CRISTOBAL | Mexico | ||
| SCK | Sky Cam | SKYCAM | France | ||
| W3 | SCL | Switfair Cargo | SWIFTAIR | Canada | |
| SCB | Saigon Capital Aircraft Management | SAIGON | Netherlands | ||
| SCN | South American Airlines | SOUTH AMERICAN | Peru | ||
| AHI | Servicios Aéreos de Chihuahua Aerochisa | AEROCHISA | Mexico | ||
| FP | AND | Servicios Aéreos de los Andes | SERVI ANDES | Peru | 2014 [53] |
| SCP | Scorpio Aviation | SCORPIO | Egypt | ||
| SCQ | OSM Aviation Academy | SCAVAC | Norway, Sweden and San Diego | ||
| SIC | SFS Aviation | SICHART | Thailand | ||
| SCR | Silver Cloud Air | SILVER CLOUD | Germany | ||
| SCS | South African Non Scheduled Airways | SOUTHERN CHARTERS | South Africa | ||
| SCT | SAAB-Aircraft | SAAB-CRAFT | Sweden | ||
| SCV | Servicios Aéreos Del Centro | SACSA | Mexico | ||
| SY | SCX | Sun Country Airlines | SUN COUNTRY | United States | |
| SDA | St. Andrews Airways | SAINT ANDREWS | Canada | ||
| SDB | Sukhoi Design Bureau Company | SU-CRAFT | Russia | ||
| SDC | Sunrise Airlines | SUNDANCE | United States | ||
| SDD | Skymaster Air Taxi | SKY DANCE | United States | ||
| SDE | Air Partners Corp. | STAMPEDE | Canada | ||
| SDF | Sundorph Aeronautical Corporation | SUNDORPH | United States | ||
| SDH | Servicio De Helicopteros | ARCOS | Spain | ||
| SDK | SADELCA - Sociedad Aérea Del Caquetá | SADELCA | Colombia | ||
| SDL | Skydrift | SKYDRIFT | United Kingdom | ||
| SDN | Spirit of Africa Airlines | BLUE NILE | Sudan | ||
| SDU | Sud Airlines | SUD LINES | France | ||
| SDV | Servicios Aéreos Del Vaupes | SELVA | Colombia | ||
| SDX | Servicio Tecnico Aero De Mexico | SERVICIO TECNICO | Mexico | ||
| SDZ | Sudan Pezetel for Aviation | SUDANA | Sudan | ||
| SEA | Southeast Air | SOUTHEAST AIR | United States | ||
| SEB | Servicios Aéreos Luce | SERVILUCE | Mexico | ||
| SED | Sedona Air Center | SEDONA AIR | United States | ||
| SEE | Shaheen Air Cargo | SHAHEEN CARGO | Pakistan | ||
| SEH | Sky Express | AIR CRETE | Greece | ||
| SG | SEJ | Spicejet | SPICEJET | India | |
| SEK | Skyjet | SKALA | Kazakhstan | ||
| SEL | Sentel Corporation | SENTEL | United States | ||
| SEO | Selcon Airlines | SELCON AIR | Nigeria | ||
| I6 | SEQ | Sky Eyes | SKY EYES | Thailand | |
| SES | Servicio Aéreo Saltillo | SERVISAL | Mexico | ||
| EH | SET | SAETA | SAETA | Ecuador | |
| SEV | Serair Transworld Press | CARGOPRESS | Spain | ||
| SFA | SEFA | SEFA | France | defunct - absorbed into École Nationale de l'Aviation Civile, with new ICAO code NAK | |
| SFC | Shuswap Flight Centre | SHUSWAP | Canada | ||
| SFE | Sefofane Air Charters | SEFOFANE | Botswana | Rebranded "Wilderness Air" | |
| SFF | Safewings Aviation Company | SWIFTWING | United States | ||
| SFG | Sun Freight Logistics | AERO GULF | Thailand | ||
| 7G | SFJ | Star Flyer | STARFLYER | Japan | |
| SFL | Southflight Aviation | SOUTHFLIGHT | New Zealand | ||
| SFN | Safiran Airlines | SAFIRAN | Iran | ||
| SFP | Safe Air | SAFE AIR | Pakistan | ||
| FA | SFR | Safair | CARGO | South Africa | |
| SFS | Southern Frontier Air Transport | SOUTHERN FRONTIER | Canada | ||
| SFT | Skyfreight | SKYFREIGHT | United States | ||
| SFU | Solent Flight | SAINTS | United Kingdom | ||
| SFX | S.K. Logistics | SWAMP FOX | United States | ||
| SGB | Sky King, Inc. | SONGBIRD | United States | ||
| SGC | Southern Right Air Charter | SOUTHERNRIGHT | South Africa | ||
| SGD | Sky Gate International Aviation | AIR BISHKEK | Kyrgyzstan | ||
| SGF | STAC Swiss Government Flights | STAC | Switzerland | ||
| SGH | Servisair | SERVISAIR | United Kingdom | ||
| SGI | Servicios Aéreos Agrícolas | SERAGRI | Chile | ||
| SGK | Skyward Aviation | SKYWARD | Canada | ||
| SGM | Sky Aircraft Service | SIGMA | Netherlands | ||
| SGN | Siam GA | SIAM | Thailand | ||
| SGP | Sagolair Transportes Ejecutivos | SAGOLAIR | Spain | ||
| SGS | Saskatchewan Government Executive Air Service | SASKATCHEWAN | Canada | ||
| SGT | Skygate | SKYGATE | Netherlands | ||
| SGU | Samgau | RAUSHAN | Kazakhstan | ||
| SGX | Saga Airlines | Turkey | |||
| N5 | SGY | Skagway Air Service | SKAGWAY AIR | United States | |
| SHB | Shabair | SHABAIR | Democratic Republic of the Congo | ||
| SHC | Sky Harbor Air Service | SKY HARBOR CHEYENNE | United States | ||
| SHD | Sahara Airlines | Algeria | |||
| SHE | Shell Aircraft | SHELL | United Kingdom | ||
| SHG | Shoprite Group | SHOP AIR | United Kingdom | ||
| SHJ | Sharjah Ruler's Flight | SHARJAH | United Arab Emirates | ||
| SHK | Shorouk Air | Egypt | |||
| SHL | Samson Aviation | SAMSON | United Kingdom | ||
| SHM | Sheltam Aviation | SHELTAM | South Africa | ||
| SHN | Shaheen Airport Services | SUGAR ALFA | Pakistan | ||
| SHO | Sheremetyevo-Cargo | Russia | |||
| SHP | Service Aerien Francais | SAF | France | ||
| SHQ | Shanghai Airlines Cargo | SHANGHAI CARGO | China | ||
| SHR | Shooter Air Courier | SHOOTER | Canada | ||
| SHS | Shura Air Transport Services | SHURA AIR | Ethiopia | ||
| HZ | SHU | Sakhalinskie Aviatrassy (SAT) | SATAIR | Russia | |
| SP | SAT | SATA Air Acores | SATA | Portugal | |
| 8S | Scorpio Aviation | ||||
| SHV | Shavano Air | SHAVANO | United States | ||
| SHW | Shawnee Airline | SHAWNEE | United States | Air South | |
| SHX | Slim Aviation Services | SLIM AIR | Nigeria | ||
| ZY | SHY | Sky Airlines | ANTALYA BIRD | Turkey | |
| SQ | SIA | Singapore Airlines | SINGAPORE | Singapore | |
| 5M | SIB | Sibaviatrans | SIBAVIA | Russia | |
| SIE | Sierra Express | SEREX | United States | ||
| SI | SIH | Skynet Airlines | BLUEJET | Ireland | 2001–2004 |
| SIJ | Seco International | Japan | |||
| 3M | SIL | Silver Airways | SILVER WINGS | United States | |
| SIL | Servicios Aeronáuticos Integrales | SERVICIOS INTEGRALES | Mexico | ||
| SIM | Star Air | Sierra Leone | |||
| SIO | Sirio (airline) | SIRIO | Italy | ||
| SIR | Salair | SALAIR | United States | ||
| SIS | Saber Airlines | Egypt | |||
| XS | SIT | SITA | Belgium | ||
| SIV | Slovenian Armed Forces | SLOVENIAN | Slovenia | ||
| SIW | Sirio Executive | SIRIO EXECUTIVE | Italy | ||
| SJA | Servicios Aéreos Especiales De Jalisco | SERVICIOJAL | Mexico | ||
| SJC | Servicios Ejecutivos Continental | SERVIEJECUTIVO | Mexico | ||
| SJE | Sunair 2001 | SUNBIZ | South Africa | ||
| SJJ | Spirit Aviation | SPIRIT JET | United States | ||
| SJL | Servicios Especiales Del Pacifico Jalisco | SERVICIOS JALISCO | Mexico | ||
| SJT | Swiss Jet | SWISS JET | Switzerland | ||
| SJY | Sriwijaya Air | SRIWIJAYA | Indonesia | ||
| ZS | SMY | Sama Airlines | NAJIM | Saudi Arabia | |
| ALC | Southern Jersey Airways, Inc. | ACOM | United States | ||
| SPS | Spark Shuttle | Spark Shuttle | United States | ||
| SPT | Speed Aviation | SPEED AVIATION | Bangladesh | ||
| SPU | Southeast Airmotive | SPUTTER | United States | ||
| SPV | Servicios Privados De Aviación | SERVICIOS PRIVADOS | Mexico | ||
| SPW | Speedwings | SPEEDWING | Switzerland | ||
| SPX | Spark Express (Glow) | Glow|United States | |||
| SQA | Slovak National Aeroclub | SLOVAK AEROCLUB | Slovakia | ||
| SQ | SQC | Singapore Airlines Cargo | SINGCARGO | Singapore | |
| SQF | Slovak Air Force | SLOVAK AIRFORCE | Slovakia | ||
| SQL | Servicos De Alquiler | ALQUILER | Mexico | ||
| SRA | Sair Aviation | SAIR | Canada | ||
| SRC | Searca | SEARCA | Colombia | ||
| FT | SRH | Siem Reap Airways | SIEMREAP AIR | Cambodia | |
| SX | SRK | Sky Work Airlines | SKYFOX | Switzerland | |
| SM | SRL | Swedline Express | Starline | Sweden | Ceased operations 2006 |
| SRL | Servicios Aeronáuticos Aero Personal | SERVICIOS PERSONAL | Mexico | ||
| SRN | Sirair | SIRAIR | Russia | ||
| P8 | SRN | SprintAir | SPRINTAIR | Poland | |
| SRO | Servicios Aéreos Ejecutivos Saereo | SAEREO | Ecuador | ||
| SRQ | South East Asian Airlines | SEAIR | Philippines | Rebranded to Tiger Airways Philippines | |
| SRS | Selkirk Remote Sensing | PHOTO CHARLIE | Canada | ||
| SRU | Star Up | STAR-UP | Peru | ||
| SRW | Sarit Airlines | SARIA | Sudan | ||
| SRX | Sierra Expressway Airlines | SIERRA EX | United States | ||
| SRZ | Strato Air Services | STRATO | South Africa | ||
| SSB | Sasair | SASIR | Canada | ||
| SSC | Southern Seaplane | SOUTHERN SKIES | United States | ||
| SSD | Star Service International | STAR SERVICE | France | ||
| SSE | Servicios Aéreos Sunset | SUNSET | Mexico | ||
| D2 | SSF | Severstal Air Company | SEVERSTAL | Russia | |
| SSG | Slovak Government Flying Service | SLOVAK GOVERNMENT | Slovakia | ||
| VD | BBB | SwedJet Airways | BLACKBIRD | Sweden | |
| SSK | Skystar International | SKYSTAR | United States | ||
| SSO | Special Scope Limited | DOPE | United Kingdom | ||
| SSP | Starspeed | STARSPEED | United Kingdom | ||
| QF | SSQ | Sunstate Airlines | SUNSTATE | Australia | Uses IATA of parent QANTAS. |
| SSR | Sardinian Sky Service | SARDINIAN | Italy | ||
| SSS | SAESA | SAESA | Spain | ||
| SST | Sunwest Airlines | SUNFLIGHT | Canada | ||
| SSU | SASCA | SASCA | Venezuela | ||
| 5G | SSV | Skyservice Airlines | SKYTOUR | Canada | defunct |
| SSW | Streamline Aviation | STREAMLINE | United Kingdom | ||
| SSY | Sky Aviation | SIERRA SKY | Sierra Leone | ||
| SSZ | Specsavers Aviation | SPECSAVERS | United Kingdom | ||
| STA | Star Aviation | STAR | United Kingdom | ||
| STB | Status-Alpha Airline | STATUS-ALPHA | Ukraine | ||
| STC | Stadium City Limited | STADIUM | United Kingdom | ||
| STD | Servicios De Aerotransportacion De Aguascalientes | AERO AGUASCALINETES | Mexico | ||
| STE | Semitool Europe | SEMITRANS | United Kingdom | ||
| STF | SFT-Sudanese Flight | Sudan | |||
| STG | Sedalia, Marshall, Boonville Stage Line | STAGE | United States | ||
| STH | South-Airlines | Armenia | |||
| STI | Sontair | SONTAIR | Canada | ||
| STJ | Sella Aviation | STELLAVIA | Netherlands | ||
| RE | STK | Stobart Air | STOBART | Ireland | |
| STL | Stapleford Flight Centre | STAPLEFORD | United Kingdom | ||
| STO | Streamline Ops | SLOPS | Russia | ||
| STQ | Star Air | STERA | Indonesia | ||
| FS | STU | Servicios de Transportes Aéreos Fueguinos | FUEGUINO | Argentina | ICAO and call sign not current |
| STU | Star African Air | STARSOM | Somali Republic | ||
| SUU | Star West Aviation | SUNSTAR | United States | ||
| STV | Saturn Aviation | SATURN | United States | ||
| STW | South West Air Corporation | SIERRA WHISKEY | Philippines | ||
| STX | Stars Away Aviation | STARSAWAY | South Africa | ||
| STY | Styrian Airways | STYRIAN | Austria | ||
| SUA | Silesia Air | AIR SILESIA | Czech Republic | ||
| SUB | Suburban Air Freight | SUB AIR | United States | ||
| SD | SUD | Sudan Airways | SUDANAIR | Sudan | |
| PI | SUF | Sun Air (Fiji) | SUNFLOWER | Fiji | |
| LW | FDY | Sun Air International | FRIENDLY | United States | |
| SUG | Sunu Air | SUNU AIR | Senegal | ||
| SUH | Sun Light | LIGHT AIR | Kyrgyzstan | ||
| SUI | Swiss Air Force | SWISS AIR FORCE | Switzerland | ||
| SUK | Superior Aviation Services | SKYCARGO | Kenya | ||
| SUM | State Unitary Air Enterprise | SUMES | Russia | ||
| SUR | Sun Air | Egypt | |||
| EZ | SUS | Sun Air of Scandinavia | SUNSCAN | Denmark | |
| URF | Surf Air | SURF AIR | United States | ||
| SUT | Sistemas Aeronauuticos 2000 | SISTEMAS AERONAUTICOS | Mexico | ||
| SUV | Sundance Air | DANCEAIR | Venezuela | ||
| SV | SVA | Saudia | SAUDIA | Saudi Arabia | |
| SVD | St. Vincent Grenadines Air (1990) | GRENADINES | Saint Vincent and the Grenadines | ||
| SVF | Swedish Armed Forces | SWEDEFORCE | Sweden | ||
| AWJ | Sahel Airlines | SAHEL AIRLINES | Niger | ||
| SVH | Sterling Helicopters | SILVER | United Kingdom | ||
| SVI | Servicios De Transporte Aéreo | SETRA | Mexico | ||
| SVJ | Silver Air | Djibouti | |||
| SVL | Sevastopol-Avia | SEVAVIA | Ukraine | ||
| SVN | Savanair (Angola) | SAVANAIR | Angola | ||
| SVO | Servicios Aeronáuticos De Oriente | SERVIORIENTE | Mexico | ||
| SVS | Servicios Aéreos Saar | AEREOS SAAR | Mexico | ||
| SVT | Seven Four Eight Air Services | SIERRA SERVICES | Luxembourg | ||
| SVX | Security Aviation | SECURITY AIR | United States | ||
| WN | SWA | Southwest Airlines | SOUTHWEST | United States | |
| SWB | Swissboogie Parapro | SWISSBOOGIE | Switzerland | ||
| SWC | South West Air | SAINT CLAIR | Canada | ||
| A4 | SWD | Southern Winds Airlines | SOUTHERN WINDS | Argentina | |
| SWE | Swedeways | SWEDELINE | Sweden | ||
| Spurling Aviation | AIR SEATTLE | United States | Code was ASL | ||
| WG | SWG | Sunwing Airlines | SUNWING | Canada | |
| SWI | Sunworld Airlines | SUNWORLD | United States | ||
| SWJ | StatesWest Airlines | STATES | United States | ||
| SWO | Surinam International Victory Airline | SIVA | Suriname | defunct | |
| SWP | Star Work Sky | STAR WORK | Italy | ||
| WQ | SWQ | Swift Air (Interstate Equipment Leasing) | SWIFTFLIGHT | United States | |
| LX | SWR | Swiss International Air Lines | SWISS | Switzerland | |
| SR | SWR | Swissair | SWISSAIR | Switzerland | defunct |
| SR | SDR | Sundair | SUNDAIR | Germany | |
| SWS | Sunwest Aviation (Lindquist Investment) | SUNNY WEST | United States | ||
| SWT | Swiftair | SWIFT | Spain | ||
| LZ [57] | SWU | Swiss Global Air Lines | EUROSWISS | Switzerland | |
| WV | SWV | Swe Fly | FLYING SWEDE | Sweden | |
| S8 | SWW | Shovkoviy Shlyah | WAY AERO | Ukraine | |
| Q4 | SWX | Swazi Express Airways | SWAZI EXPRESS | Eswatini | |
| WO | WSW | Swoop | SWOOP | Canada | |
| SWY | Sky Jet | SWISSLINK | Switzerland | ||
| SWZ | Servair, Private Charter | SWISSBIRD | Switzerland | Code re-allocated | |
| S8 | SWZ | Skywise Airline | SKYWISE | South Africa | |
| SXA | Southern Cross Aviation | FERRY | United States | ||
| SXC | Sky Exec Aviation Services | SKY EXEC | Nigeria | ||
| SXE | Southeast Express Airlines | DOGWOOD EXPRESS | United States | ||
| SXM | Servicios Aéreos Especializados Mexicanos | SERVIMEX | Mexico | ||
| XQ | SXS | SunExpress | SUNEXPRESS | Turkey | |
| SXT | Servicios De Taxi Aéreo | SERTA | Mexico | ||
| SXX | Satellite Aero | SATELLITE EXPRESS | United States | ||
| SXY | Safari Express Cargo | SAFARI EXPRESS | Kenya | ||
| SYA | Skyways | LINEAS CARDINAL | Argentina | ||
| SYC | Systec 2000 | SYSTEC | United States | ||
| SYE | Sheba Aviation | Yemen | |||
| SYF | Sky One Express Airlines | SKY FIRST | United States | ||
| SYG | Synergy Aviation | SYNERGY | United Kingdom | ||
| SYI | Sonalysts | United States | |||
| SYJ | Slate Falls Airways | Canada | |||
| SYK | Satsair | AEROCAB | United States | (J and A Properties) | |
| SYN | Syncrude Canada | SYNCRUDE | Canada | ||
| RB | SYR | Syrian Arab Airlines | SYRIANAIR | Syrian Arab Republic | |
| SYS | Shawbury Flying Training Unit | SHAWBURY | United Kingdom | ||
| SYV | Special Aviation Systems | SPECIAL SYSTEM | United States | ||
| AL | SYX | Skywalk Airlines | SKYWAY-EX | United States | (Astral Aviation) |
| ZP | AZQ | Silk Way Airlines | SILK LINE | Azerbaijan | |
| 7L | AZG | Silk Way West Airlines | SILK WEST | Azerbaijan | |
| SYY | South African Historic Flight | SKY COACH | South Africa | ||
| SZT | Servicios Aeronáuticos Z | AERO ZEE | Mexico | ||
| BHV | Specavia Air Company | AVIASPEC | Russia | ||
| BLY | Starair | BLARNEY | Ireland | ||
| BNC | Sundance Air | BARNACLE AIR | United States | ||
| E5 | BRZ | Samara Airlines | BERYOZA | Russia | defunct |
| E5 | RBG | Air Arabia Egypt | ARABIA EGYPT | Egypt | |
| CBN | Swedish Civil Aviation Administration | CALIBRATION | Sweden | ||
| SC | CDG | Shandong Airlines | SHANDONG | China | |
| CDS | Spectrem Air | SPECDAS | South Africa | ||
| CEE | Servicios Aéreos Centrales | CENTRA AEREOS | Mexico | ||
| CFL | Swedish Airlines | SWEDISH | Sweden | ||
| CGL | Seagle Air | SEAGLE | Slovakia | ||
| CIG | Sirius-Aero | SIRIUS AERO | Russia | ||
| CNK | Sunwest Home Aviation | CHINOOK | Canada | ||
| SK | CNO | SAS Braathens | SCANOR | Norway | |
| 9C | CQH | Spring Airlines | AIR SPRING | China | |
| 3U | CSC | Sichuan Airlines | SI CHUAN | China | |
| FM | CSH | Shanghai Airlines | SHANGHAI AIR | China | Part of China Eastern Airlines |
| CSY | Shuangyang General Aviation | SHUANGYANG | China | ||
| ZH | CSZ | Shenzhen Airlines | SHENZHEN AIR | China | |
| 8C | CXI | Corendon Airlines Europe | TOURIST | Malta | |
| DKT | Sioux Falls Aviation | DAKOTA | United States | ||
| DKY | Servicios Aéreos Elite | DAKOY | Spain | ||
| DNI | Servicios Aéreos Denim | AERO DENIM | Mexico | ||
| EAB | Swiss Eagle | SWISS EAGLE | Switzerland | ||
| EAN | Skypower Express Airways | NIGERIA EXPRESS | Nigeria | Express Airways Nigeria | |
| ENR | Scenic Air | Namibia | |||
| 7L | ERO | Sun D'Or | ECHO ROMEO | Israel | |
| NE | ESK | SkyEurope | RELAX | Slovakia | defunct |
| CQ | EXL | Sunshine Express Airlines | Australia | ||
| EXY | South African Express | EXPRESSWAYS | South Africa | ||
| FFD | Stuttgarter Flugdienst | FIRST FLIGHT | Germany | ||
| FFH | Shalom Air Services | PEACE AIR | Nigeria | ||
| FJE | Silverjet | ENVOY | United Kingdom | ||
| FLH | Sky Bus | MILE HIGH | United States | ||
| GAD | South Coast Aviation | SOUTHCOAST | United Kingdom | ||
| GDE | Servicios Aéreos Gadel | GADEL | Mexico | ||
| GDG | S.P. Aviation | GOLDEN GATE | United States | ||
| GIK | Seba Airlines | SEBA | Guinea | ||
| GNA | Servicios Aéreos Gana | SERVIGANA | Mexico | ||
| GSW | Sky Wings Airlines | Greece | |||
| GXL | Star XL German Airlines | STARDUST | Germany | ||
| HAU | Skyhaul | SKYHAUL | Japan | ||
| HIP | Starship | STARSA | Mexico | ||
| HJE | Servicios Ejecutivos Gosa | GOSA | Mexico | ||
| SO | HKA | Superior Aviation | SPEND AIR | United States | |
| HLO | Samaritan Air Service | HALO | Canada | ||
| KI | SJB | SKS Airways | SOUTHER TIGER | Malaysia | Operates scheduled flights to outlying islands from Subang Airport to Redang and Tioman. |
| HRI | Skyraidybos Mokymo Centras | HELIRIM | Lithuania | ||
| HSK | Sky Europe Airlines | MATRA | Slovakia | ||
| HSV | Svenska Direktflyg | HIGHSWEDE | Sweden | ||
| HSY | Sky Helicopteros | HELISKY | Spain | ||
| TE | IGA | Skytaxi | IGUANA | Poland | |
| IJS | Silvair | United States | |||
| ILS | Servicios Aéreos Ilsa | SERVICIOS ILSA | Mexico | ||
| INK | Sincom-Avia | SINCOM AVIA | Ukraine | ||
| IRV | Safat Airlines | SAFAT AIR | Iran | ||
| IRZ | Saha Airlines Services | SAHA | Iran | ||
| JAM | Sunline Express | SUNTRACK | Kenya | ||
| JCM | Secure Air Charter | SECUREAIR | United States | ||
| JIM | Sark International Airways | SARK | United Kingdom | ||
| JK | JKK | Spanair | SPANAIR | Spain | defunct |
| KKS | Salem | KOKSHE | Kazakhstan | ||
| KOP | Servicios Aéreos Copters | COPTERS | Chile | ||
| KSP | Servicios Aéreos Expecializados En Transportes Petroleros | SAEP | Colombia | ||
| KYR | Sky Aeronautical Services | SKY AERONAUTICAL | Mexico | ||
| LGU | Servicios Aéreos Ejecutivos De La Laguna | LAGUNA | Mexico | ||
| LLA | Servico Leo Lopex | LEO LOPOZ | Mexico | ||
| LLS | Servicios Aéreos Estrella | SERVIESTRELLA | Mexico | ||
| LMG | South African Air Force | SOUTH AFRICAN | South Africa | ||
| LMO | Sky One Holdings as Privaira | SKY HOLDINGS | United States | Callsign and company name changed from Sky Limo Corporation "SKY LIMO" in 2015. [58] | |
| RZ* | LRS | Sansa | Costa Rica | ||
| LSP | Spectrum Aviation Incorporated | AIR TONY | United Kingdom | ||
| MCG | SOS Helikoptern Gotland | MEDICOPTER | Sweden | ||
| MDT | Sundt Air | MIDNIGHT | Norway | ||
| MLO | Servicios Aéreos Milenio | MILENIO | Mexico | ||
| MMS | SAAD (A320) Limited | MUSAAD AIR | Cayman Islands | ||
| MRI | Servicios Aéreos Moritani | MORITANI | Mexico | ||
| 2G* | MRR | San Juan Airlines | MARINER | United States | |
| MSG | Servico Aéreo Regional | SAR-REGIONAL | Mozambique | ||
| MSP | Servicio De Vigilancia Aérea Del Ministerio De Seguridad Pública | SEGURIDAD | Costa Rica | ||
| MTG | Servicios Aéreos MTT | Mexico | |||
| 1Z | APD | Sabre Pacific | Australia | ||
| 1S | Sabre | United States | |||
| 1I | Sierra Nevada Airlines | United States | |||
| 1H | Siren-Travel | Russia | |||
| 1Q | Sirena | Russia | |||
| SBW | Snowbird Airlines | SNOWMAN | Finland | ||
| 1K | Southern Cross Distribution | Australia | |||
| 1K | Sutra | United States | |||
| 2C | SNCF | France | |||
| 2S | Star Equatorial Airlines | Guinea | |||
| NAD | Seulawah Nad Air | SEULAWAH | Indonesia | ||
| NAZ | Servicios Aéreos del Nazas S.A. de C.V. | NAZAS | Mexico | ||
| NCS | Simpson Air Ltd | COMMUTER-CANADA | Canada | ||
| NK | NKS | Spirit Airlines | SPIRIT WINGS | United States | |
| NON | Servicios Aéreos Latinoamericanos | SERVICIOS LATINO | Mexico | ||
| NRZ | Servicios Aéreos Monarrez | MONARREZ | Mexico | ||
| NSC | Societe De Transport Aerien De Mauritanie | TRANS-SOCIETE | Mauritania | ||
| NSE | SATENA | SATENA | Colombia | ||
| NTB | Servicios Aéreos Del Norte | SERVINORTE | Mexico | ||
| NTG | Servicios Integrales De Aviación | INTEGRALES | Mexico | ||
| S0 | OKS | Slok Air Gambia | SLOK GAMBIA | Gambia | |
| OKT | Soko Aviation | SOKO AIR | Spain | ||
| OLC | Solar Cargo | SOLARCARGO | Venezuela | ||
| OLO | Soloflight | SOLO | United Kingdom | ||
| ONG | Sonnig SA | SONNIG | Switzerland | ||
| SO | OSL | Sosoliso Airlines | SOSOLISO | Nigeria | |
| OSS | Servicios Aéreos Noticiosos | NOTICIOSOS | Mexico | ||
| OTL | South Airlines | SOUTHLINE | Ukraine | ||
| VA | VOZ | Virgin Australia Regional Airlines | VELOCITY | Australia | Operated under Virgin Australia |
| PIV | Sokol | AEROSOKOL | Russia | ||
| PLT | South Carolina Aeronautics Commission | PALMETTO | United States | ||
| PMR | Servicios Aéreos Premier | SERVICIOS PREMIER | Mexico | ||
| PNS | Survey Udara (Penas) | PENAS | Indonesia | ||
| POB | Servicios Aéreos Poblanos | POBLANOS | Mexico | ||
| PSV | Servicios Aéreos Profesionales | PROSERVICIOS | Dominican Republic | ||
| PTM | Southeastern Airways | POSTMAN | United States | ||
| PUR | Spurwing Airlines | SPURWING | South Africa | ||
| 1I | PZR | Sky Trek International Airlines | PHAZER | United States | |
| RBW | Shandong Airlines Rainbow Jet | CAI HONG | China | ||
| REJ | SA Airlink Regional | REGIONAL LINK | South Africa | ||
| RER | Servicio Aéreo Regional Regair | REGAIR | Ecuador | ||
| RFT | Scoala Superioara De Aviatie Civila | ROMANIAN ACADEMY | Romania | ||
| RGC | Servicios Aéreos Regiomontanos | REGIOMONTANO | Mexico | ||
| RLS | S-Air | S-AIRLINES | Russia | ||
| RMP | Servicios De Rampa Y Mostrador | SERAMSA | Mexico | ||
| RSE | SNAS Aviation | RED SEA | Saudi Arabia | ||
| SX | SKB | Skybus Airlines | SKYBUS | United States | defunct |
| SKC | Skymaster Airlines | SKYMASTER AIR | Brazil | ||
| SKD | Sky Harbor Air Service | SKY DAWG | United States | ||
| SKE | Sky Tours | SKYISLE | United States | ||
| AZG | Sakaviaservice | SAKSERVICE | Georgia | Defunct | |
| SKF | Skycraft | SKYCRAFT | United States | ||
| SKG | Skycraft Air Transport | SKYCRAFT-CANADA | Canada | ||
| RU | SKI | SkyKing Turks and Caicos Airways | SKYKING | Turks and Caicos Islands | IATA was QW |
| SKK | Skylink Aviation | SKYLINK | Canada | ||
| SKL | Skycharter (Malton) | SKYCHARTER | Canada | ||
| SKN | Skyline Aviation Services | SKYLINER | United States | ||
| SKO | Scottish Airways Flyers | SKYWORK | United Kingdom | ||
| SKR | Skyscapes Air Charters | SKYSCAPES | South Africa | ||
| SKS | Sky Service | SKY SERVICE | Belgium | Callsign re-allocated | |
| SKS | Sky Link Aviation | Pakistan | |||
| S3 | BBR | Santa Barbara Airlines | SANTA BARBARA | Venezuela | |
| XT | SKT | SkyStar Airways | SKY YOU | Thailand | |
| H2 | SKU | Sky Airline | AEROSKY | Chile | |
| OO | SKW | SkyWest Airlines | SKYWEST | United States | |
| JZ | SKX | Skyways Express | SKY EXPRESS | Sweden | Ceased operations 2012; Operations continue as Avia Express |
| BC | SKY | Skymark Airlines | SKYMARK | Japan | |
| SKZ | Skyway Enterprises | SKYWAY-INC | United States | ||
| LJ | SLA | Sierra National Airlines | SELAIR | Sierra Leone | |
| SLB | Slok Air | SLOK AIR | Nigeria | ||
| SLD | Silver Air | SILVERLINE | Czech Republic | ||
| SLE | Streamline | SLIPSTREAM | South Africa | ||
| SLF | Starfly | ELISTARFLY | Italy | ||
| SLG | Saskatchewan Government | LIFEGUARD | Canada | Air Ambulance Service | |
| SLH | Silverhawk Aviation | SILVERHAWK | United States | ||
| AGE | Servicios Aéreos de Los Ángeles | AEROANGEL | Mexico | ||
| MI | SLK | SilkAir | SILKAIR | Singapore | Merged with Singapore Airlines |
| 6Q | SLL | Slovak Airlines | SLOV LINE | Slovakia | |
| PY | SLM | Surinam Airways | SURINAM | Suriname | |
| SLN | Sloane Aviation | SLOANE | United Kingdom | ||
| SLP | Salpa Aviation | SALPA | Sudan | ||
| SLS | Servicios Aéreos Slainte | SERVICIOS SLAINTE | Mexico | ||
| SLV | Stella Aviation | AVISTELLA | Mauritania | ||
| SLW | Salama Airlines Nigeria | SALMA AIR | Nigeria | ||
| SLX | Sete Linhas Aéreas | SETE | Brazil | ||
| SLY | Sky Line for Air Services | SKYCO | Sudan | ||
| SLZ | Super Luza | LUZA | Angola | ||
| SMA | SMA Airlines | SESAME | Nigeria | ||
| SMC | Sabang Merauke Raya Air Charter | SAMER | Indonesia | ||
| SMD | Servicios Aéreos La Marquesa | SERVICIOS MARQUESA | Mexico | ||
| 8D | Servant Air | United States | |||
| SME | Semos | SEMICH | Kazakhstan | ||
| SMF | Smalandsflyg | GORDON | Sweden | ||
| SMH | Smithair | SMITHAIR | United States | ||
| SMK | Semeyavia | ERTIS | Kazakhstan | ||
| SML | Smith Air (1976) | SMITH AIR | Canada | ||
| SMM | Summit Air | SUMMIT | Canada | ||
| SMQ | Samar Air | SAMAR AIR | Tajikistan | ||
| SMR | Somon Air | SOMON AIR | Tajikistan | ||
| SMT | Skyline | SKYLIMIT | Nigeria | ||
| AOS | Servicios Aéreos Del Sol, S.A. de C.V. | AEROSOL | Mexico | ||
| SNA | Senator Aviation Charter | SENATOR | Germany | ||
| NB | SNB | Sterling Airlines | STERLING | Denmark | |
| SNE | Servicios Aéreos De Nicaragua (SANSA) | SANSA | Nicaragua | ||
| SNF | Shans Air | SHANS AIR | Russia | ||
| SNH | Senair Services | SENSERVICE | Senegal | ||
| SNI | Savanah Airlines | SAVANAHLINE | Nigeria | ||
| 6J | SNJ | Solaseed Air | NEWSKY | Japan | |
| SNK | Southeast Airlines (Sun Jet International) | SUN KING | United States | ||
| SNL | Soonair Lines | SOONAIR | United States | ||
| SNM | Servizi Aerei | SERVIZI AEREI | Italy | ||
| SNP | Sun Pacific International | SUN PACIFIC | United States | ||
| SNQ | Sun Quest Executive Air Charter | EXECU-QUEST | United States | ||
| SNS | Societe Centrafricaine De Transport Aerien | Central African Republic | |||
| SNT | Suncoast Aviation | SUNCOAST | United States | ||
| SNU | Snunit Aviation | Israel | |||
| SNV | Sudanese States Aviation | SUDANESE | Sudan | ||
| SNW | Sun West Airlines | SUN WEST | United States | ||
| SNX | Sun Air Aviation Services | SUNEX | Canada | ||
| SOB | Stabo Freight | STABO | Zambia | ||
| SOC | Southern Cargo Air Lines | Russia | |||
| SOH | Southern Ohio Aviation Sales | SOUTHERN OHIO | United States | ||
| SOI | Southern Aviation | SOAVAIR | Zambia | ||
| IE | SOL | Solomon Airlines | SOLOMON | Solomon Islands | |
| SOM | Somali Airlines | SOMALAIR | Somali Republic | ||
| SON | Sunshine Air Tours | SUNSHINE TOURS | United States | ||
| SOO | Southern Air | SOUTHERN AIR | United States | ||
| SOP | Solinair | SOLINAIR | Slovenia | ||
| SOR | Sonair Servico Aéreo | SONAIR | Angola | ||
| SOT | Southeast Correct Craft | SOUTH COURIER | United States | ||
| 9X | SOU | Southern Airways | SOUTHERN EXPRESS | United States | |
| 6W | SOV | Saratov Airlines Joint Stock Company | SARATOV AIR | Russia | |
| SOW | Sowind Air | SOWIND | Canada | Defunct - code reallocated | |
| SOW | White Sparrow GmbH | SPARROW | Austria | [59] | |
| SOX | Solid Air | SOLIDAIR | Netherlands | ||
| HZ | SOZ | Sat Airlines | SATCO | Kazakhstan | |
| SPA | Sierra Pacific Airlines | SIERRA PACIFIC | United States | ||
| SPB | Springbok Classic Air | SPRING CLASSIC | South Africa | ||
| SPC | Spark Air Cargo | Spark Cargo | United States | ||
| SPE | Sprague Electric Company | SPRAGUE | United States | ||
| SPF | Space World Airline | SPACE WORLD | Nigeria | ||
| SPG | Springdale Air Service | SPRING AIR | United States | ||
| SPH | Sapphire Executive Air | SAPPHIRE-CHARTER | South Africa | ||
| SPI | South Pacific Island Airways | SOUTH PACIFIC | United States | ||
| SPK | Spark Airlines | SPARK | United States | ||
| SPL | Servicios Corporativos Aéreos De La Laguna | CORPORATIVOS LAGUNA | Mexico | ||
| SPN | Skorpion Air | AIR SKORPIO | Bulgaria | ||
| SPP | Sapphire Aviation | SAPPHIRE | United States | ||
| SPQ | Servicios Aéreos Palenque | SERVICOS PALENQUE | Mexico | ||
| TBS | Servicios Aéreos Tribasa | TRIBASA | Mexico | ||
| S5 | TCF | Shuttle America | MERCURY | United States | |
| SVV | SALTAVIATION | SALT | Poland | [60] | |
| TGT | SAAB Nyge Aero | TARGET | Sweden | ||
| THB | Spark Air | THAI SABAI | Thailand | ||
| TIH | S C Ion Tiriac | TIRIAC AIR | Romania | ||
| TRL | Starlite Aviation | STARSTREAM | South Africa | ||
| TRN | Servicios Aéreos Corporativos | AEROTRON | Mauritania | ||
| TTM | Societe Tout Transport Mauritanien | TOUT-AIR | Mauritania | ||
| TZU | Servicios Aéreos Tamazula | TAMAZULA | Mexico | ||
| UGP | Shar Ink | SHARINK | Russia | ||
| UKU | Second Sverdlovsk Air Enterprise | PYSHMA | Russia | ||
| UNT | Servicios Aéreos Universitarios | UNIVERSITARIO | Mexico | ||
| USK | Skif-Air | SKIF-AIR | Ukraine | ||
| USN | Smarkand Aero Servise | SAMAS | Uzbekistan | ||
| UZS | Samarkand Airways | SOGDIANA | Uzbekistan | ||
| VDO | Servicios Aéreos Avandaro | AVANDARO | Mexico | ||
| VGS | Stichting Vliegschool 16Hoven | SMART | Netherlands | ||
| VRB | Silverback Cargo Freighters | SILVERBACK | Rwanda | ||
| VRS | Sirvair | VAIRSA | Mexico | ||
| DV | VSV | Scat Air | VLASTA | Kazakhstan | |
| VXN | Sunset Aviation | VIXEN | United States | ||
| TWY | Sunset Aviation, LLC | TWILIGHT | United States | dba Solairus Aviation | |
| WCC | Sport Air Travel | WEST COAST | United States | ||
| WFC | Swift Copters | SWIFTCOPTERS | Switzerland | ||
| WLK | Skyrover CC | SKYWATCH | South Africa | ||
| XLK | Safarilink Aviation | SAFARILINK | Kenya | ||
| XMX | SENEAM | SENEAM | Mexico | ||
| XPG | Southport Air Service | United States | |||
| XSA | Spectrum Air Service | United States | |||
| XSN | Stephenville Aviation Services | Canada | |||
| XTA | Servicios Aéreos Textra | TEXTRA | Mexico | ||
| XTR | Sector Airlines | EXTER | Canada | ||
| XXS | Skyplan Services | Canada | |||
| YBE | Stewart Aviation Services | YELLOW BIRD | United States | ||
| R1 | Sirin | ||||
| SXN | SaxonAir | SAXONAIR | United Kingdom | ||
| O3 | CSS | SF Airlines | SHUN FENG | China | |
| SAF | Singapore Air Force | SINGA | Singapore | ||
| KFE | SkyFirst LTD | SKYFIRST | Malta | 2012 | |
| PQ | SQP | SkyUp | SKYUP | Ukraine | |
| U5 | SkyUp MT | Malta | |||
| S5 | LLC | Small Planet Airlines | SMALL PLANET | Lithuania | defunct |
| P7 | LLP | Small Planet Airlines | SKYPOL | Poland | defunct |
| P2 | LLI | Small Planet Airlines | AURIGA | Italy | defunct |
| 5P | LLX | Small Planet Airlines | GERMANJET | Germany | defunct |
| UL | ALK | SriLankan Airlines | SRILANKAN | Sri Lanka | |
| DJ | SRR | Star Air | WHITESTAR | Denmark | |
| V9 | HCW | Star1 Airlines | STAR1 | Lithuania | defunct |
| Q4 | TLK | Starlink Aviation | STARLINK | Canada | |
| UFA | State Flight Academy of Ukraine | FLIGHT ACADEMY | Ukraine | ||
| CDL | Sunbird Airlines | CAROLINA | United States | ||
| XG | SXD | Sunexpress Deutschland | SUNRISE | Germany | |
| SO | AAS | Sunshine Airlines | defunct | ||
| RZ | Superna Airlines | YANGTZE RIVER | China | ||
| TC | ATC | Air Tanzania Company Limited | TANZANIA | Tanzania | |
| 9L | TOW | AirTanker Services | TOWLINE | United Kingdom | |
| DG | SRQ | Cebgo | BLUE JAY | Philippines | Formerly SEAir, South East Asian Airlines and Tigerair Philippines |
| TLO | Eagle Canyon Airlines | TALON AIR | United States | ||
| 1L | OSY | Open Skies Consultative Commission | OPEN SKIES | United States | |
| 2S | TGR | Satgur Air Transport | SATGURAIR | Liberia | defunct |
| DT | DTA | TAAG Angola Airlines | DTA | Angola | |
| IRF | TA-Air Airline | TA-AIR | Iran | ||
| TBI | TAB Express International | TAB INTERNATIONAL | United States | ||
| TBM | Taban Air Lines | TABAN AIR | Iran | ||
| THO | TACA De Honduras | LEMPIRA | Honduras | ||
| VR | TCV | TACV | CABOVERDE | Cape Verde | |
| TDC | Tadair | TADAIR | Spain | Ceased operation in 2003 | |
| TES | Taespejo Portugal LDA | Tesaban | Portugal | ||
| HET | TAF Helicopters | HELITAF | Spain | ||
| TSD | TAF-Linhas Aéreas | TAFI | Brazil | ||
| SBT | Taftan Airlines | TAFTAN | Iran | ||
| FPG | TAG Aviation | TAG AVIATION | Switzerland | ||
| TGM | TAG Aviation Espana | TAG ESPANA | Spain | ||
| VIP | Tag Aviation UK | SOVEREIGN | United Kingdom | ||
| TAG | TAG Aviation USA | TAG U-S | United States | ||
| FBO | TAG Farnborough Airport | United Kingdom | |||
| TI | TWI | Tailwind Airlines | TAILWIND | Turkey | |
| TIN | Taino Tours | TAINO | Dominican Republic | ||
| TFB | Tair Airways | ROYAL TEE-AIR | Philippines | ||
| TJK | Tajikair | TAJIKAIR | Tajikistan | ||
| TZK | Tajikistan International Airlines | TAJIKISTAN | Tajikistan | ||
| TKE | Take Air Line | ISLAND BIRD | France | ||
| JEL | Tal Air Charters | JETEL | Canada | ||
| TAL | Talair | TALAIR | Papua New Guinea | ||
| TFF | Talon Air | TALON FLIGHT | United States | ||
| PZ | LAP | TAM Mercosur | PARAGUAYA | Paraguay | |
| EQ | TAE | TAME | TAME | Ecuador | Transporte Aéreos Militares Ecuatorianos |
| TMI | Tamir Airways | TAMIRWAYS | Israel | ||
| QT | TPA | TAMPA | TAMPA | Colombia | |
| TNR | Tanana Air Services | TAN AIR | United States | ||
| TQ | TDM | Tandem Aero | TANDEM | Moldova | |
| HTO | Tango Bravo | HELI TANGO | France | ||
| TP | TAP | TAP Portugal | AIR PORTUGAL | Portugal | |
| UTM | TAPC Aviatrans Aircompany | AVIATAPS | Uzbekistan | ||
| TPS | TAPSA Transportes Aéreos Petroleros | TAPSA | Argentina | ||
| K3 | TQN | Taquan Air Services | TAQUAN | United States | |
| THC | Tar Heel Aviation | TARHEEL | United States | ||
| TPL | TAR Interpilot | INTERPILOT | Mauritania | ||
| IRR | Tara Air Line | TARAIR | Iran | ||
| TTH | Tarhan Tower Airlines | Turkey | |||
| RO | ROT | Tarom | TAROM | Romania | |
| RMS | Tas Aviation | TASS AIR | United States | ||
| CTP | Tashkent Aircraft Production Corporation | CORTAS | Uzbekistan | ||
| HJ | TMN | Tasman Cargo Airlines | TASMAN | Australia | [ citation needed ] |
| SF | DTH | Tassili Airlines | TASSILI AIR | Algeria | |
| PGS | Tauranga Aer Club | New Zealand | |||
| T6 | TVR | Tavrey Airlines | TAVREY | Ukraine | |
| TQE | Taxair Mexiqienses | TAXAIR | Mexico | ||
| TXL | Taxi Aéreo Cozatl | TAXI COZATL | Mexico | ||
| TXM | Taxi Aéreo de México | TAXIMEX | Mexico | ||
| TUO | Taxi Aéreo Turístico | TURISTICO | Mexico | ||
| XNR | Taxi Aero Del Norte | TAXI NORTE | Mexico | ||
| TDV | Taxi Aero Nacional Del Evora | TAXI EVORA | Mexico | ||
| TRF | Taxi Air Fret | TAXI JET | France | ||
| VRC | Taxi de Veracruz | VERACRUZ | Mexico | ||
| TXR | Taxirey | TAXIREY | Mexico | ||
| TPR | Taxis Aéreos De Parral | TAXIS PARRAL | Mexico | ||
| TXO | Taxis Aéreos de Sinaloa | TAXIS SINALOA | Mexico | ||
| TNE | Taxis Aéreos del Noroeste | TAXINOROESTE | Mexico | ||
| TPF | Taxis Aéreos del Pacífico | TAXIPACIFICO | Mexico | ||
| TMH | Taxis Turisticos Marakame | TAXIMARAKAME | Mexico | ||
| TYF | Tayflite | TAYFLITE | United Kingdom | ||
| TFY | Tayside Aviation | TAYSIDE | United Kingdom | ||
| L6 | VNZ | Tbilaviamsheni | TBILAVIA | Georgia | |
| RRY | Tbilisi Aviation University | AIRFERRY | Georgia | ||
| TCD | Tchad Airlines | TCHADLINES | Chad | ||
| TIM | TEAM Linhas Aéreas | TEAM BRASIL | Brazil | ||
| L9 | TLW | Teamline Air | Teamline | Austria | |
| TEM | Tech-Mont Helicopter Company | TECHMONT | Slovakia | ||
| TEF | Tecnicas Fotograficas | TECFOTO | Spain | ||
| TBN | Teebah Airlines | TEEBAH | Sierra Leone | ||
| THR | Tehran Airline | TEHRAN AIR | Iran | ||
| U8 | CYF | Tel Aviv Air | TUS AIR | Germany | defunct |
| TCM | Teledyne Continental Motors | TELEDYNE | United States | ||
| TLX | Telesis Transair | TELESIS | United States | ||
| TEL | Telford Aviation | TELFORD | United States | ||
| TDE | Tellavia / Flight One | TELLURIDE | United States | ||
| DOT | Telnic Limited | DOT TEL | United Kingdom | ||
| TEH | Tempelhof Airways | TEMPELHOF | United States | ||
| TMS | Temsco Helicopters | TEMSCO | United States | ||
| TNL | Tengeriyn Ulaach Shine | SKY HORSE | Mongolia | ||
| TEB | Tenir Airlines | TENIR AIR | Kyrgyzstan | ||
| TNG | Tennessee Air National Guard 164th Airlift Group | United States | |||
| TEN | Tennessee Airways | TENNESSEE | United States | ||
| TET | Tepavia-Trans Airlines | TEPAVIA | Moldova | ||
| TER | Territorial Airlines | TERRI-AIRE | United States | ||
| TIS | Tesis | TESIS | Russia | ||
| TXZ | Tex Star Air Freight | TEX STAR | United States | ||
| TXA | Texair Charter | OKAY AIR | United States | ||
| TXT | Texas Air Charters | TEXAS CHARTER | United States | Group One | |
| TXS | Texas Airlines | TEXAIR | United States | ||
| CWT | Texas Airways | TEXAS AIRWAYS | United States | ||
| TXN | Texas National Airlines | TEXAS NATIONAL | United States | ||
| K9 | TEZ | TezJet | Tezjet | Kyrgyzstan | Started in 2014 |
| TGC | TG Aviation | THANET | United Kingdom | ||
| T2 | TCG | Thai Air Cargo | THAI CARGO | Thailand | |
| FD | AIQ | Thai AirAsia | THAI ASIA | Thailand | |
| XJ | TAX | Thai AirAsia X | EXPRESS WING | Thailand | |
| TG | THA | Thai Airways International | THAI | Thailand | |
| TSL | Thai Aviation Services | THAI AVIATION | Thailand | ||
| TXZ | Thai Express Air | EXPRESS AIR | Thailand | ||
| TFH | Thai Flying Helicopter Service | THAI HELICOPTER | Thailand | ||
| TFT | Thai Flying Service | THAI FLYING | Thailand | ||
| THG | Thai Global Airline | THAI GLOBAL | Thailand | ||
| THJ | Thai Jet Intergroup | THAI JET | Thailand | ||
| SL | TLM | Thai Lion Mentari | MENTARI | Thailand | |
| TPV | Thai Pacific Airlines Business | THAI PACIFIC | Thailand | ||
| 9I | LLR | Thai Sky Airlines | THAI SKY AIR | Thailand | |
| WE | THD | Thai Smile Airways | THAI SMILE | Thailand | |
| T9 | TSX | Thai Star Airlines | THAI STAR | Thailand | |
| VZ | TVJ | Thai Vietjet Air | THAIVIET JET | Thailand | |
| 2H | Thalys | Belgium | Not an airline (train). Used for codesharing | ||
| GFN | The 955 Preservation Group | GRIFFON | United Kingdom | ||
| LEG | The Army Aviation Heritage Foundation | LEGACY | United States | ||
| LCC | The Lancair Company | LANCAIR | United States | ||
| HQ | TCW | Thomas Cook Airlines | KESTREL | Belgium | Defunct |
| MT | TCX | Thomas Cook Airlines | KESTREL | United Kingdom | |
| IHS | Thryluthjonustan | Iceland | |||
| THU | Thunder Airlines | AIR THUNDER | Canada | ||
| TBD | Thunderbird Tours | ORCA | Canada | ||
| BLI | Thyssen Krupp AG | BLUELINE | Germany | ||
| GS | GCR | Tianjin Airlines | BO HAI | China | |
| 3P | TNM | Tiara Air | TIARA | Aruba | |
| TBA | Tibet Airlines | TIBET | China | ||
| TIK | Tic Air | TICAIR | Australia | ||
| TJN | Tien-Shan | NERON | Kazakhstan | ||
| TT | TGG | Tigerair Australia | TIGGOZ | Australia | Previously TGW, callsign GO CAT |
| MDL | Tigerair Mandala | MANDALA | Indonesia | defunct, original airline code RI | |
| TR | TGW | Tigerair Singapore | GO CAT | Singapore | Merged with Scoot |
| IT | TTW | Tigerair Taiwan | SMART CAT | Taiwan | |
| MOH | Tigerfly | MOTH | United Kingdom | ||
| TKC | Tikal Jets Airlines | TIKAL | Guatemala | ||
| TMR | Timberline Air | TIMBER | Canada | ||
| TIE | Time Air | TIME AIR | Czech Republic | ||
| BOX | Tiphook PLC | BOX | United Kingdom | defunct | |
| TVI | Tiramavia | TIRAMAVIA | Moldova | ||
| ZT | AWC | Titan Airways | ZAP | United Kingdom | |
| TYJ | TJS Malta Ltd. | TYROLMALTA | Malta | ||
| TSR | TJS San Marino S.r.L. | SAN MARINO | San Marino | ||
| TLS | TLC Air | TEALSY | United States | ||
| TMM | TMC Airlines | WILLOW RUN | United States | ||
| 3V | TAY | TNT Airways | QUALITY | Belgium | |
| NTR | TNT International Aviation | NITRO | United Kingdom | ||
| TBX | Tobago Express | TABEX | Trinidad and Tobago | ||
| 7T | TOB | Tobruk Air | TOBRUK AIR | Libya | |
| TOJ | TOJ Airlines | TOJ AIRLINE | Tajikistan | ||
| TI | TOL | Tol-Air Services | TOL AIR | United States | |
| TMK | Tomahawk Airways | TOMAHAWK | United States | ||
| TOP | Top Air | AIR TOP | Indonesia | ||
| CHE | Top Flight Air Service | CHECK AIR | United States | ||
| TLY | Top Fly | TOPFLY | Spain | ||
| LKW | Top Sky International | TOPINTER | Indonesia | ||
| TPD | Top Speed | TOP SPEED | Austria | ||
| TTL | Total Linhas Aéreas | TOTAL | Brazil | ||
| TOT | Totavia | Canada | Aviation Information Services | ||
| THE | Toumai Air Tchad | TOUMAI AIR | Chad | ||
| THF | Touraine Helicoptere | TOURAINE HELICO | France | ||
| Tower Air | Ceased operations | ||||
| TOY | Toyota Canada | TOYOTA | Canada | ||
| TGE | Trabajos Aéreos | TASA | Spain | ||
| AIM | Trabajos Aéreos Murcianos | PIJO | Spain | ||
| TVH | Trabajos Aéreos Vascongados | TRAVASA | Spain | ||
| TDR | Trade Air | TRADEAIR | Croatia | ||
| TJ | GPD | Tradewind Aviation | GOODSPEED | United States | |
| TDX | Tradewinds Airlines | TRADEWINDS EXPRESS | United States | Wrangler Aviation | |
| TWL | Tradewinds Aviation | TRADEWINDS CANADA | Canada | ||
| JCH | Trading Air Cargo | TRADING CARGO | Mauritania | ||
| TDO | TRADO | TRADO | Dominican Republic | Transporte Aéreo Dominicano | |
| TRG | TRAGSA (Medios Aéreos) | Spain | |||
| HBA | Trail Lake Flying Service | HARBOR AIR | United States | ||
| TMQ | TRAM | TRAM AIR | Mauritania | ||
| TMX | Tramon Air | TRAMON | South Africa | ||
| TRR | Tramson Limited | TRAMSON | Sudan | ||
| MUI | Trans Air | MAUI | United States | ||
| TRC | Trans Air Charter | TRACKER | United States | ||
| TWW | Trans Air Welwitchia | WELWITCHIA | Angola | ||
| TNB | Trans Air-Benin | TRANS-BENIN | Benin | ||
| RTM | Trans Am Compania | AERO TRANSAM | Ecuador | ||
| CLR | Trans America | CLINTON AIRWAYS | United States | ||
| TVA | Trans America Airlines | TRANS-AMERICA | United States | ||
| TPU | Trans American Airlines (Trans Am) | TRANS PERU | Peru | ||
| TRT | Trans Arabian Air Transport | TRANS ARABIAN | Sudan | ||
| SRT | Trans Asian Airlines | TRASER | Kazakhstan | ||
| TLL | Trans Atlantic Airlines | ATLANTIC LEONE | Sierra Leone | ||
| LTA | Trans Atlantis | LANTRA | Canada | ||
| TCC | Trans Continental Airlines | TRANSCAL | Sudan | ||
| TCN | Trans Continental Airlines | TRANSCON | United States | ||
| TRJ | Trans Euro Air | HIGH TIDE | United Kingdom | ||
| TGY | Trans Guyana Airways | TRANS GUYANA | Guyana | ||
| THZ | Trans Helicoptere Service | LYON HELIJET | France | ||
| TIA | Trans International Airlines | TRANS INTERNATIONAL | United States | ||
| BAP | Trans International Express Aviation | BIG APPLE | United States | ||
| TRD | Trans Island Air | TRANS ISLAND | Barbados | ||
| SWL | Trans Jet Airways | TRANSJET | Sweden | ||
| TL | TMA | Trans Mediterranean Airlines | TANGO LIMA | Lebanon | |
| TMT | Trans Midwest Airlines | TRANS MIDWEST | United States | ||
| TNW | Trans Nation Airways | TRANS-NATION | Ethiopia | ||
| TNT | Trans North Turbo Air | TRANS NORTH | Canada | ||
| REC | Trans Reco | TRANS-RECO | Mauritania | ||
| SBJ | Trans Sahara Air | TRANS SAHARA | Nigeria | ||
| TSM | Trans Sayegh Airport Services | Lebanon | |||
| AX | LOF | Trans States Airlines | WATERSKI | United States | |
| TW | TWA | Trans World Airlines | TWA | United States | |
| RBD | Trans World Express | RED BIRD | United States | ||
| UN | TSO | Transaero Airlines | TRANSOVIET | Russia | |
| TNF | Transafricaine | TRANSFAS | Burkina Faso | ||
| TCG | Transafricaine Air Cargo | AFRICARGO | Burkina Faso | ||
| TFK | Transafrik International | São Tomé and Príncipe | |||
| TSA | Transair France | AIRTRAF | France | ||
| TGX | Transair Gabon | TRANSGABON | Gabon | ||
| TNI | Transair International Linhas Aéreas | TRANSINTER | United States | ||
| TSN | Trans-Air Services | AIR TRANS | Nigeria | ||
| TSG | Trans-Air-Congo | TRANS-CONGO | Republic of the Congo | ||
| KTS | Transair-Gyraintiee | KOTAIR | Russia | ||
| GJB | Trans-Air-Link | SKY TRUCK | United States | ||
| TWM | Transairways | Mozambique | |||
| UTT | Transarabian Transportation Services | ARABIAN TRANSPORT | Uganda | ||
| GE | TNA | TransAsia Airways | Taiwan | defunct | |
| AUC | Transaustralian Air Express | AUSCARGO | Australia | Defunct | |
| VEN | Transaven | TRANSAVEN AIRLINE | Venezuela | ||
| TO | TVF | Transavia France | FRANCE SOLEIL | France | |
| HV | TRA | Transavia Holland | TRANSAVIA | Netherlands | |
| KTB | Transaviabaltika | TRANSBALTIKA | Lithuania | ||
| AL | TXC | TransAVIAexport Airlines | TRANSEXPORT | Belarus | |
| FNV | Transaviaservice | TRANSAVIASERVICE | Georgia | ||
| TVO | Transavio | TRANS-BALLERIO | Italy | ||
| TR | TBA | Transbrasil | TRANSBRASIL | Brazil | defunct |
| TIW | Transcarga Intl Airways | TIACA | Venezuela | ||
| TCE | Trans-Colorado Airlines | TRANS-COLORADO | United States | ||
| TCH | Transcontinental Air | TRANS GULF | Bahrain | ||
| KRA | Transcontinental Airlines | REGATA | Kazakhstan | ||
| TCT | Transcontinental Sur | TRANS-CONT | Uruguay | ||
| TCP | Transcorp Airways | TRANSCORP | United Kingdom | ||
| UE | TEP | Transeuropean Airlines | TRANSEURLINE | Russia | |
| TFA | Trans-Florida Airlines | TRANS FLORIDA | United States | ||
| TCU | Transglobal Airways Corporation | TRANSGLOBAL | Philippines | ||
| TXE | Transilvania Express | TRANSAIR EXPRESS | Romania | ||
| KCA | Trans-Kiev | TRANS-KIEV | Ukraine | ||
| TLA | Translift Airways | TRANSLIFT | Ireland | ||
| TMD | Transmandu | TRANSMANDU | Venezuela | ||
| TMD | Transmed Airlines | Egypt | |||
| T9 | TRZ | TransMeridian Airlines | TRANS-MERIDIAN | United States | Defunct |
| TH | RMY | Raya Airways | TRANSMILE | Malaysia | |
| TNV | Transnorthern | TRANSNORTHERN | United States | ||
| TPP | Transpac Express | TRANS EXPRESS | Australia | ||
| PCW | Trans-Pacific Orient Airways | PACIFIC ORIENT | Philippines | ||
| TPM | Transpaís Aéreo | TRANSPAIS | Mexico | ||
| TNP | Transped Aviation | TRANSPED | Austria | ||
| TRM | Transport Aerien de Mauritanie | SOTRANS | Mauritania | ||
| TLF | Transport Africa | TRANS-LEONE | Sierra Leone | ||
| TGO | Transport Canada | TRANSPORT | Canada | ||
| TFI | Transport Facilitators | United States | |||
| TQR | Transportación Aérea De Querétaro | TRANSQUERETARO | Mexico | ||
| MCT | Transportación Aérea Del Mar De Cortés | TRANS CORTES | Mexico | ||
| TPN | Transportación Aérea del Norte | AEREA DELNORTE | Mexico | ||
| TTR | Transportaciones Y Servicios Aéreos | TRANSPORTACIONES | Mexico | ||
| TSI | Transport'air | TRANSPORTAIR | France | ||
| TCB | Transporte Aereo De Colombia | AERO COLOMBIA | Colombia | ||
| TAD | Transporte Aéreo Dominicano | TRANS DOMINICAN | Dominican Republic | ||
| TZE | Transporte Aéreo Ernesto Saenz | TRANSPORTE SAENZ | Mexico | ||
| TTS | Transporte Aéreo Técnico Ejecutivo | TECNICO | Mexico | ||
| MGM | Transporte Aero MGM | AERO EMM-GEE-EMM | Mexico | ||
| TMZ | Transporte Amazonair | TRANS AMAZON | Venezuela | ||
| TCB | Transporte del Caribe | TRANSCARIBE | Colombia | ||
| EAR | Transporte Ejecutivo Aéreo | EJECUTIVO-AEREO | Mexico | ||
| TPT | Transportes Aéreo del Sureste | TASSA | Mexico | ||
| MPO | Transportes Aéreos Amparo | AMPARO | Mexico | ||
| BOL | Transportes Aéreos Bolivianos | BOL | Bolivia | ||
| TDI | Transportes Aéreos de Ixtlán | TRANSIXTLAN | Mexico | ||
| TPX | Transportes Aéreos De Xalapa | TRANSXALAPA | Mexico | ||
| TMY | Transportes Aéreos del Mundo Maya | MUNDO MAYA | Mexico | ||
| TFO | Transportes Aéreos del Pacífico | TRANSPORTES PACIFICO | Mexico | ||
| DCL | Transportes Aéreos Don Carlos | DON CARLOS | Chile | ||
| ROU | Transportes Aéreos I. R. Crusoe | ROBINSON CRUSOE | Chile | ||
| TSP | Transportes Aéreos Inter | TRANSPO-INTER | Guatemala | ||
| MXQ | Transportes Aéreos Mexiquenses | MEXIQUENSES | Mexico | ||
| TX | TAN | Transportes Aéreos Nacionales | Honduras | Defunct | |
| ELV | Transportes Aéreos Nacionales De Selva Tans | AEREOS SELVA | Peru | ||
| TPG | Transportes Aéreos Pegaso | TRANSPEGASO | Mexico | ||
| TGI | Transportes Aéreos Regionales | TRANSPORTE REGIONAL | Mexico | ||
| SRF | Transportes Aéreos San Rafael | SAN RAFEAL | Chile | ||
| RRT | Transportes Aéreos Sierra | SIERRA ALTA | Mexico | ||
| SEI | Transportes Aéreos Sierra Madre | TRANSPORTE SIERRA | Mexico | ||
| TAU | Transportes Aéreos Tauro | TRANSTAURO | Mexico | ||
| TPZ | Transportes La Paz | TRANSPAZ | Mexico | ||
| OF | TML | Transports et Travaux Aériens de Madagascar | TAM AIRLINE | Madagascar | |
| TPY | Trans-Provincial Airlines | TRANS PROVINCIAL | Canada | ||
| TTC | Transteco | TRANSTECO | Angola | ||
| UTN | Trans-Ulgii | TRANS-ULGII | Mongolia | defunct | |
| TWE | Transwede Airways | TRANSWEDE | Sweden | ||
| 9T | ABS | Transwest Air | ATHABASKA | Canada | |
| TRW | Transwestern Airlines of Utah | TRANS-WEST | United States | ||
| TSW | Transwings | SWISSTRANS | Switzerland | ||
| TST | TRAST | TRAST | Kazakhstan | ||
| S5 | TSJ | Trast Aero | TRAST AERO | Kyrgyzstan | |
| TSK | Trast Aero | TOMSK-AVIA | Kyrgyzstan | ||
| TAX | Travel Air | TRAVELAIR | United States | ||
| TIC | Travel International Air Charters | TRAVEL INTERNATIONAL | Zambia | ||
| TMC | Travel Management Company | TRAIL BLAZER | United States | ||
| TLV | Travelair | PAJAROS | Uruguay | ||
| 1E | Travelsky Technology | China | |||
| TDA | Trend Aviation | TREND AIR | United States | ||
| TNX | Trener Ltd | TRAINER | Hungary | ||
| TRU | Triangle Airline (Uganda) | TRI AIR | Uganda | ||
| SWD | Trifly | SAWBLADE | United States | ||
| TGN | Trigana Air Service | TRIGANA | Indonesia | ||
| GY | TMG | Tri-MG Intra Asia Airlines | TRILINES | Indonesia | |
| TBH | Trinity Air Bahamas | Bahamas | |||
| T4 | TIB | TRIP Linhas Aéreas | TRIP | Brazil | IATA code 8R changed to T4 (2010) |
| CLU | Triple Alpha | CAROLUS | Germany | ||
| TTP | Triple O Aviation | MIGHTY WING | Nigeria | ||
| TSY | Tristar Air | TRIPLE STAR | Egypt | ||
| TRY | Tristar Airlines | TRISTAR AIR | United States | ||
| TSS | Tri-State Aero | TRI-STATE | United States | ||
| DRC | Triton Airlines | TRITON AIR | Canada | ||
| TSV | Tropair Airservices | TROPIC | United Kingdom | ||
| PM | TOS | Tropic Air | TROPISER | Belize | |
| TRO | Tropic Airlines-Air Molokai | MOLOKAI | United States | ||
| M7 | TBG | Tropical Airways | Haiti | ||
| TKX | Tropical International Airways | TROPEXPRESS | Saint Kitts and Nevis | ||
| TCA | Tropican Air Services | TROPICANA | Egypt | ||
| TYG | Trygg-Flyg | TRYGG | Sweden | ||
| TZ | TDS | Tsaradia | TSARADIA | Madagascar | |
| PSS | TSSKB-Progress | PROGRESS | Russia | ||
| TTA | TTA - Sociedade de Transporte e Trabalho Aéreo | KANIMANBO | Mozambique | ||
| TBR | Tubelair | TUBELAIR | Tunisia | ||
| BY | TOM | TUI Airways | TOM JET | United Kingdom | Formerly "TOMSON" |
| TB | JAF | TUI fly Belgium | BEAUTY | Belgium | |
| X3 | TUI | TUI fly Deutschland | TUI JET | Germany | |
| OR | TFL | TUI fly Netherlands | ORANGE | Netherlands | |
| 6B | BLX | TUI fly Nordic | BLUESCAN | Sweden | |
| TD | TLP | Tulip Air | TULIPAIR | Netherlands | |
| TUL | Tulpar Air | URSAL | Russia | ||
| TUX | Tulpar Air Service | TULPA | Kazakhstan | ||
| TUZ | Tuna Aero | TUNA | Sweden | ||
| UG | TUX | Tuninter | Tunisia | ||
| TU | TAR | Tunisair | TUNAIR | Tunisia | |
| TAJ | Tunisavia | TUNISAVIA | Tunisia | ||
| 3T | URN | Turan Air | TURAN | Azerbaijan | |
| TBC | Turbine Air Cargo UK | United Kingdom | |||
| TAC | Turbot Air Cargo | TURBOT | Senegal | ||
| TRQ | Turdus Airways | HUNTER | Netherlands | Defunct, ICAO code in use by another airline | |
| TUC | Turismo Aéreo de Chile | TURICHILE | Chile | ||
| THK | Turk Hava Kurumu Hava Taksi Isletmesi | HUR KUS | Turkey | ||
| THS | Turkish Aerospace Industries | TUSAS | Turkey | ||
| HVK | Turkish Air Force | TURKISH AIRFORCE | Turkey | ||
| TK | THY | Turkish Airlines | TURKISH | Turkey | |
| TRK | Turkish Airlines General Aviation | TURKISH REPUBLIC | Turkey | ||
| T5 | TUA | Turkmenistan Airlines | TURKMENISTAN | Turkmenistan | |
| TLT | Turtle Airways | TURTLE | Fiji | ||
| USB | Tusheti | TUSHETI | Georgia | ||
| TW | TWB | T'way Air | TWAYAIR | Republic of Korea | |
| TWO | Twente Airlines | COLIBRI | Netherlands | ||
| TCY | Twin Cities Air Service | TWIN CITY | United States | ||
| T7 | TJT | Twin Jet | TWINJET | France | |
| TNY | Twin Town Leasing Company | TWINCAL | United States | ||
| TWJ | Twinjet Aircraft Sales | United Kingdom | |||
| TYW | Tyrol Air Ambulance | TYROL AMBULANCE | Austria | ||
| VO | TYR | Tyrolean Airways | TYROLEAN | Austria | Renamed from Austrian Arrows |
| TJS | Tyrolean Jet Services | TYROLJET | Austria | ||
| TUM | Tyumenspecavia | TUMTEL | Russia | ||
| VNX | TKK | flyADVANCED | TARKA | United States | Aero Ways Inc. flyADVANCED |
| UEU | United European Airlines | UNITED EUROPEAN | Romania | 2014 [61] | |
| UCG | Uniworld Air Cargo | UNIWORLD | Panama | 2014 [61] | |
| CUH | Urumqi Airlines | LOULAN | China | 2014 [61] | |
| DOD | USAF Air Mobility Operations Control Center | United States | |||
| DOI | U.S. Department of the Interior | INTERIOR | United States | Office of Aircraft Services | |
| CNV | U.S. Navy Reserve Logistic Air Forces | CONVOY | United States | U.S. Navy Reserve Logistic Air Forces, New Orleans, LA, USA | |
| EXM | United Kingdom Civil Aviation Authority | EXAM | United Kingdom | CAA Flight Examiners | |
| GIH | Union des Transports Africains de Guinee | TRANSPORT AFRICAIN | Guinea | ||
| GKA | US Army Parachute Team | GOLDEN KNIGHTS | United States | ||
| GWY | USA3000 Airlines | GETAWAY | United States | was U5 | |
| B7 | UIA | UNI Air | GLORY | Taiwan | |
| UAB | United Arabian Airlines | UNITED ARABIAN | Sudan | ||
| UA | UAL | United Airlines | UNITED | United States | |
| 4H | UBD | United Airways | UNITED BANGLADESH | Bangladesh | |
| UAC | United Air Charters | UNITAIR | Zimbabwe | ||
| UCS | United Carriers Systems | UNITED CARRIERS | United States | ||
| UEA | United Eagle Airlines | UNITED EAGLE | China | ||
| UFS | United Feeder Service | FEEDER EXPRESS | United States | formerly part of United Express | |
| CFU | United Kingdom Civil Aviation Authority | MINAIR | United Kingdom | Civil Aviation Authority Flying Unit | |
| KRF | United Kingdom Royal VIP Flights | KITTYHAWK | United Kingdom | In Military Aircraft | |
| KRH | United Kingdom Royal VIP Flight | SPARROWHAWK | United Kingdom | In Civil Chartered Aircraft | |
| SDS | United Kingdom Civil Aviation Authority | STANDARDS | United Kingdom | Training Standards | |
| TQF | United Kingdom Royal VIP Flights | RAINBOW | United Kingdom | Helicopter Flights | |
| CGX | United States Coast Guard Auxiliary | COASTGUARD AUXAIR | United States | ||
| AGR | United States Department Of Agriculture | AGRICULTURE | United States | ||
| UAD | University Air Squadron | United Kingdom | MOD Boscombe Down | ||
| UAJ | University Air Squadron | United Kingdom | Glasgow | ||
| UAA | University Air Squadron | United Kingdom | Leuchars | ||
| UAS | University Air Squadron | United Kingdom | RAF Cranwell | ||
| HBU | Universal Avia | KHARKIV UNIVERSAL | Ukraine | ||
| HLE | UK HEMS | HELIMED | United Kingdom | ||
| U7 | JUS | USA Jet Airlines | JET USA | United States | |
| LEA | Unijet | LEADAIR | France | ||
| MSH | US Marshals Service | MARSHALAIR | United States | US Department of Justice | |
| NDU | University of North Dakota | SIOUX | United States | ||
| PNA | Universal Airlines | PACIFIC NORTHERN | United States | ||
| Upali Air | UPALI | Sri Lanka | defunct | ||
| RAU | Uganda Royal Airways | UGANDA ROYAL | Uganda | ||
| SAU | United Aviation Services | UNISERVE | Spain | ||
| U6 | SVR | Ural Airlines | SVERDLOVSK AIR | Russia | |
| TRB | Ukraine Transavia | KIROVTRANS | Ukraine | ||
| UAF | United Arab Emirates Air Force | UNIFORCE | United Arab Emirates | ||
| UAI | Union Africaine des Transports | UNAIR | Ivory Coast | ||
| UCC | Uganda Air Cargo | UGANDA CARGO | Uganda | ||
| UCH | US Airports Air Charter | US CHARTER | United States | ||
| UCO | Ucoaviacion | UCOAVIACION | Spain | ||
| UES | Ues-Avia Aircompany | AVIASYSTEM | Ukraine | ||
| QU | UGA | Uganda Airlines (1976–2001) | UGANDA | Uganda | Ceased operations 2001 |
| UR | UGD | Uganda Airlines | CRESTED | Uganda | Started operations in 2019 |
| UGC | Urgemer Canarias | URGEMER | Spain | ||
| UHL | Ukrainian Helicopters | UKRAINE COPTERS | Ukraine | ||
| UHS | Ulyanovsk Higher Civil Aviation School | PILOT AIR | Russia | ||
| UJR | Universal Jet Rental de Mexico | UNIVERSAL JET | Mexico | ||
| UJT | Universal Jet Aviation | UNI-JET | United States | Cancelled 2014 - Renamed Journey Aviation with code JNY | |
| UKI | UK International Airlines | KHALIQ | United Kingdom | ||
| UKL | Ukraine Air Alliance | UKRAINE ALLIANCE | Ukraine | ||
| UF | UKM | UM Airlines | UKRAINE MEDITERRANEE | Ukraine | Ukraine Mediterranean Airlines |
| UKN | Ukraine Air Enterprise | ENTERPRISE UKRAINE | Ukraine | ||
| UKP | National Police Air Service | POLICE | United Kingdom | ||
| 6Z | UKS | Ukrainian Cargo Airways | CARGOTRANS | Ukraine | |
| ULT | Ultrair | ULTRAIR | United States | ||
| ULH | Ultimate HELI | ULTIMATEHELI | South Africa | Ultimate HELI (Pty) Ltd | |
| ULR | Ultimate Air | VIPER | South Africa | Ultimate Airways (Pty) Ltd | |
| OL | ULS | Ultra Air | AIR ULTRA | Colombia | |
| UNC | Uni-Fly | UNICOPTER | Denmark | ||
| UNF | Union Flights | UNION FLIGHTS | United States | ||
| UNJ | Universal Jet | PROJET | Spain | ||
| UNS | Unsped Paket Servisi | UNSPED | Turkey | ||
| UNU | Unifly Servizi Aerei | UNIEURO | Italy | ||
| UPL | Ukrainian Pilot School | PILOT SCHOOL | Ukraine | ||
| 5X | UPS | United Parcel Service | UPS | United States | |
| URV | Uraiavia | URAI | Russia | ||
| US | AWE | US Airways | CACTUS | United States | defunct, merged with American Airlines in 2015 |
| BS | UBG | US-Bangla Airlines | BANGLA STAR | Bangladesh | |
| USF | USAfrica Airways | AFRICA EXPRESS | United States | ||
| UH | USH | US Helicopter | US-HELI | United States | |
| USJ | US Jet | USJET | United States | ||
| USX | US Express | AIR EXPRESS | United States | ||
| QU | UTN | UTair-Ukraine | UT Ukraine | Ukraine | |
| TUM | UTAir | UTAIR-CARGO | Russian Federation | 2014 [61] | |
| UT | UTA | UTair Aviation | UTAIR | Russia | WAS P2 till 2006 |
| UTR | Utair South Africa | AIRUT | South Africa | ||
| UTS | Ukrainian State Air Traffic Service Enterprise | AIRRUH | Ukraine | ||
| UTU | Urartu-Air | Armenia | |||
| UVA | Universal Airways | UNIVERSAL | United States | ||
| UVG | Universal Airlines | GUYANA JET | Guyana | ||
| UVM | Uvavemex | UVAVEMEX | Mexico | ||
| AIO | United States Air Force | AIR CHIEF | United States | Chief of Staff | |
| UVN | United Aviation | UNITED AVIATION | Kuwait | ||
| HY | UZB | Uzbekistan Airways | UZBEK | Uzbekistan | |
| PS | AUI | Ukraine International Airlines | UKRAINE INTERNATIONAL | Ukraine | |
| WEC | Universal Airlines | AIRGO | United States | ||
| US | Unavia Suisse | Switzerland | |||
| QID | USAF 100th Air Refueling Wing | QUID | United States | ||
| UIT | University of Tromsø School of Aviation | ARCTIC | Norway | ||
| UNO | United Nations | UNITED NATIONS | n/a | UNOxxx followed by P(peacekeeping), or H(Humanitarian) | |
| JW | VNL | Vanilla Air | VANILLA | Japan | Merged with Peach Aviation |
| VU | VAG | Vietravel Airlines | VIETRAVEL AIR | Vietnam | |
| VAI | Volant Aviation International | Pakistan | |||
| VAR | Veca Airlines | VECA | El Salvador | ||
| VLR | Volare 22 X | VOLAX | Mexico | ||
| VDR | Voldirect | VOLDIR | France | ||
| VVV | Valair Aviação Lda | VALAIRJET | Portugal | ||
| VB | VIV | VivaAerobus | VIVA | Mexico | |
| VIL | V I Airlink | TURTLE DOVE | British Virgin Islands | ||
| VA | VOZ | Virgin Australia | VELOCITY | Australia | Previously Used: KANGA, AURORA, VEE-OZ |
| VBA | V Bird Airlines Netherlands | VEEBEE | Netherlands | ||
| WIW | V-avia Airline | VEE-AVIA | Ukraine | ||
| VBD | V-Berd-Avia | VEEBIRD-AVIA | Armenia | ||
| VAC | Vacationair | VACATIONAIR | Canada | ||
| RDW | Valair AG (Helicoptere) | ROADWATCH | Switzerland | ||
| VLA | Valan International Cargo Charter | NALAU | South Africa | ||
| VLN | Valan Limited | VALAN | Moldova | ||
| EHR | Valfell-Verkflug | ROTOR | Iceland | ||
| VF | VLU | Valuair | VALUAIR | Singapore | Merged with Jetstar Asia 2014 |
| VF | AnadoluJet | AJet | Turkiye | ||
| J7 | VJA | ValuJet Airlines | CRITTER | United States | Now operating as AirTran Airways. J7 Reassigned. |
| VAA | Van Air Europe | EUROVAN | Czech Republic | ||
| VGC | Vanguardia en Aviación en Colima | VANGUARDIA COLIMA | Mexico | ||
| VGD | Vanguard Airlines | VANGUARD AIR | United States | ||
| VRH | Varesh Airlines | SKY VICTOR | Iran | ||
| 0V | VFC | Vietnam Air Services Company (VASCO) | VASCO AIR | Vietnam | |
| VAG | Vega | SEGA | Kazakhstan | ||
| WGA | Vega Air Company | WEGA FRANKO | Ukraine | ||
| WEL | Veles, Ukrainian Aviation Company | VELES | Ukraine | ||
| VTX | Verataxis | VERATAXIS | Mexico | ||
| BTP | Veritair | NET RAIL | United Kingdom | ||
| VC | VAL | Voyageur Airways | VOYAGEUR | Canada | |
| GRV | Vernicos Aviation | NIGHT RIDER | Greece | ||
| VN | HVN | Vietnam Airlines | VIET NAM | Vietnam | |
| TMB | Volato | Tombo | United States | ||
| KWA | Vozdushnaya Academy | VOZAIR | Kazakhstan | ||
| NN | MOV | VIM Airlines | MOV AIR | Russia | |
| MVY | VIM-Aviaservice | Russia | |||
| 2R | Via Rail Canada | Canada | |||
| ENV | Victoria Aviation | ENDEAVOUR | United Kingdom | ||
| VCT | Viscount Air Service | VISCOUNT AIR | United States | ||
| SSI | Vision Airlines | SUPER JET | Nigeria | ||
| FXF | VIP Air Charter | FOX FLIGHT | United States | ||
| PAV | VIP Avia | NICOL | Kazakhstan | ||
| PRX | VIP Avia | PAREX | Latvia | ||
| VAT | Visionair | VISIONAIR | Ireland | ||
| VA | Viasa | Venezuela | IATA Code transferred to Virgin Australia | ||
| VCA | VICA - Viacao Charter Aéreos | VICA | Brazil | ||
| VCM | Volare Air Charter Company | CARMEN | United States | ||
| Y4 | VOI | Volaris | VOLARIS | Mexico | |
| VI | VDA | Volga-Dnepr Airlines | VOLGA | Russia | |
| VEA | Vega Airlines | VEGA AIRLINES | Bulgaria | ||
| VEC | Venescar Internacional | VECAR | Venezuela | ||
| VEE | Victor Echo | VICTOR ECHO | Spain | ||
| VEI | Virgin Express Ireland | GREEN ISLE | Ireland | defunct | |
| VX | VRD | Virgin America | REDWOOD | United States | Merged with Alaska Airlines |
| VJ | VJC | Vietjet Air | VIETJET | Vietnam | |
| V4 | VES | Vieques Air Link | VIEQUES | United States | |
| TV | VEX | Virgin Express | VIRGIN EXPRESS | Belgium | defunct |
| VFT | VZ Flights | ZETA FLIGHTS | Mexico | ||
| VK | VGN | Virgin Nigeria Airways | VIRGIN NIGERIA | Nigeria | |
| VGV | Vologda State Air Enterprise | VOLOGDA AIR | Russia | ||
| VHA | VH-Air Industrie | AIR V-H | Angola | ||
| VHM | VHM Schul-und-Charterflug | EARLY BIRD | Germany | ||
| VIB | Vibroair Flugservice | VITUS | Germany | ||
| VIC | VIP Servicios Aéreos Ejecutivos | VIP-EJECUTIVO | Mexico | ||
| VIE | VIP Empresarial | VIP EMPRESARIAL | Mexico | ||
| VIF | VIF Luftahrt | VIENNA FLIGHT | Austria | ||
| VIG | Vega Aviation | VEGA AVIATION | Sudan | ||
| VIH | Vichi | VICHI | Moldova | ||
| VIK | Viking Airlines | SWEDJET | Sweden | ||
| VIN | Vinair Aeroserviços | VINAIR | Portugal | ||
| VS | VIR | Virgin Atlantic | VIRGIN | United Kingdom | |
| VJM | Viajes Ejecutivos Mexicanos | VIAJES MEXICANOS | Mexico | ||
| VJT | Vistajet | VISTA | Canada | ||
| VJT | Vistajet | VISTA MALTA | Malta | 2014 [62] | |
| ZG | VVM | Viva Macau | JACKPOT | Macao | defunct |
| VE | VLE | C.A.I. Second | VOLA | Italy | |
| VY | VLG | Vueling Airlines | VUELING | Spain | |
| XF | VLK | Vladivostok Air | VLADAIR | Russia | Merged with Aurora |
| LC | VLO | Varig Logística | VELOG | Brazil | defunct |
| VLT | Vertical-T Air Company | VERTICAL | Russia | ||
| VMA | Vero Monmouth Airlines | VERO MONMOUTH | United States | ||
| VNK | Vipport Joint Stock Company | Russia | |||
| VM | VOA | Viaggio Air | VIAGGIO | Bulgaria | |
| VOG | Voyager Airlines | VOYAGER AIR | Bangladesh | ||
| 9V | VPA | Vipair Airlines | VIAIR | Kazakhstan | defunct |
| VPB | Veteran Air | VETERAN | Ukraine | ||
| VPV | VIP-Avia | VIP AVIA | Georgia | ||
| VRA | Vertair | VERITAIR | United Kingdom | ||
| VRE | Volare Airlines | UKRAINE VOLARE | Ukraine | ||
| VRL | Voar Lda | VOAR LINHAS | Angola | ||
| RG | VRN | Varig | VARIG | Brazil | |
| VH | VVC | Viva Air Colombia | Viva Air Colombia | Colombia | Commenced operations on May 25, 2012 |
| VSB | Vickers Limited | VICKERS | United Kingdom | ||
| VSN | Vision Airways Corporation | VISION | Canada | ||
| VSO | Voronezh Aircraft Manufacturing Society | VASO | Russia | ||
| VP | VSP | VASP | VASP | Brazil | defunct |
| VSS | Virign Islands Seaplane Shuttle | WATERBIRD | United States | ||
| VTC | Vuelos Especializados Tollocan | VUELOS TOLLOCAN | Mexico | ||
| VTH | Vuelos Corporativos de Tehuacan | VUELOS TEHUACAN | Mexico | ||
| V7 | VOE | Volotea | VOLOTEA | Spain | |
| VTK | Vostok Airlines | VOSTOK | Russia | ||
| VTL | Victor Tagle Larrain | VITALA | Chile | ||
| VTV | Vointeh | VOINTEH | Bulgaria | ||
| VUR | VIP Ecuador | VIPEC | Ecuador | defunct | |
| VUS | Vuela Bus | VUELA BUS | Mexico | ||
| VZL | Vzlyet | VZLYET | Russia | ||
| VG | VLM | VLM Airlines | RUBENS | Belgium | defunct |
| WCY | Viking Express | TITAN AIR | United States | ||
| WEV | Victoria International Airways | VICTORIA UGANDA | Uganda | ||
| G6 | WLG | Air Volga | GOUMRAK | Russia | |
| VNR | Viennair | VIENNAIR | Austria | defunct | |
| UK | VTI | Vistara | Vistara | India | Commenced operations 9 January 2015 |
| WD | WDL | WDL Aviation | WDL | Germany | |
| WRR | WRA Inc | WRAP AIR | United States | ||
| XWS | WSI Corporation | United States | |||
| CGG | Walmart Aviation | CHARGE | United States | ||
| WAS | Walsten Air Services | WALSTEN | Canada | ||
| GOT | WaltAir | GOTHIC | Sweden | ||
| WPT | Wapiti Aviation | WAPITI | Canada | ||
| WAV | Warbelow's Air Ventures | WARBELOW | United States | ||
| ATX | Warwickshire Aerocentre Ltd. | AIRTAX | United Kingdom | ||
| WT | WSG | Wasaya Airways | WASAYA | Canada | |
| Wayraperú | WAYRAPERÚ | Peru | |||
| WTC | Weasua Air Transport Company | WATCO | Liberia | ||
| WH | WEB | WebJet Linhas Aéreas | WEB-BRASIL | Brazil | |
| TDB | Welch Aviation | THUNDER BAY | United States | ||
| 2W | WLC | Welcome Air | WELCOMEAIR | Austria | |
| BLW | Wermlandsflyg AB | BLUESTAR | Sweden | ||
| WCB | West Africa Airlines | KILO YANKEE | Ghana | ||
| WTF | West African Air Transport | WESTAF AIRTRANS | Senegal | ||
| WZ | WSF | West African Airlines | Benin | ||
| WAC | West African Cargo Airlines | WESTAF CARGO | Mauritania | ||
| PN | CHB | West Air (China) | WEST CHINA | China | |
| WLX | West Air Luxembourg | WEST LUX | Luxembourg | ||
| T2 | SWN | West Atlantic Sweden | AIR SWEDEN | Sweden | |
| YH | WCW | West Caribbean Airways | WEST | Colombia | |
| WCR | West Caribbean Costa Rica | WEST CARIBBEAN | Costa Rica | ||
| 8O | YWZ | West Coast Air | COAST AIR | Canada | |
| West Coast Airlines | United States | ||||
| WCG | West Coast Airlines | WHISKY INDIA | Ghana | ||
| WCA | West Coast Airways | WEST-LEONE | Sierra Leone | ||
| WCC | West Coast Charters | WEST COAST | United States | ||
| TEE | West Freugh DTEO | TEEBIRD | United Kingdom | ||
| WEW | West Wind Aviation | WESTWIND | Canada | ||
| WS | WJA | WestJet | WESTJET | Canada | |
| WAA | Westair Aviation | WESTAIR WINGS | Namibia | ||
| WSC | Westair Cargo Airlines | WESTCAR | Côte d'Ivoire | ||
| PCM | Westair Industries | PAC VALLEY | United States | ||
| BLK | Westcoast Energy | BLUE FLAME | Canada | ||
| ST* | STT | Western Aircraft, Inc | SAWTOOTH | United States | |
| WST | Western Air | WESTERN BAHAMAS | Bahamas | ||
| NPC | Western Air Couriers | NORPAC | United States | ||
| WAE | Western Air Express | WESTERN EXPRESS | United States | ||
| WA | WAL | Western Airlines | WESTERN | United States | defunct |
| WA | KLC | KLM Cityhopper | CITY | the Netherlands | |
| WAL | Western Arctic Air | WESTERN ARCTIC | Canada | ||
| WTV | Western Aviators | WESTAVIA | United States | ||
| AAE | Western Express Air | ARIZONA | United States | defunct in 2007 | |
| WES | Western Express Air Lines | WEST EX | Canada | ||
| WGN | Western Global Airlines | WESTERN GLOBAL | United States | Allocated in 2014 [63] | |
| W7 | KMR | Western Pacific Airlines | KOMSTAR | United States | |
| WPA | Western Pacific Airservice | WESTPAC | Solomon Islands | ||
| WSL | Westflight Aviation | WEST LINE | United Kingdom | ||
| WSA | Westgates Airlines | WESTATES | United States | ||
| WHE | Westland Helicopters | WESTLAND | United Kingdom | ||
| WTP | Westpoint Air | WESTPOINT | Canada | ||
| CN | WWD | Westward Airways | WESTWARD | United States | |
| WHT | White | WHITEJET | Portugal | ||
| WEA | White Eagle Aviation | WHITE EAGLE | Poland | ||
| WRA | White River Air Services | Canada | |||
| WWL | Whyalla Airlines | Australia | |||
| WF | WIF | Widerøe | WIDEROE | Norway | |
| WC | WAA | Wien Air Alaska | WIEN | United States | Wien Consolidated Airlines from 1968-1973 |
| WIG | Wiggins Airways | WIGGINS AIRWAYS | United States | ||
| WHS | Wiking Helikopter Service | WEEKING | Germany | ||
| WFO | Wilbur's Flight Operations | WILBURS | United States | ||
| WGP | Williams Grand Prix Engineering | GRAND PRIX | United Kingdom | ||
| WDA | Wimbi Dira Airways | WIMBI DIRA | Democratic Republic of Congo | ||
| WNA | Winair | WINAIR | United States | ||
| IV | JET | Wind Jet | GHIBLI | Italy | |
| WSI | Wind Spirit Air | WIND SPIRIT | United States | ||
| 7W | QGA | Windrose Air | QUADRIGA | Germany | |
| WIA | Windward Islands Airways International | WINDWARD | Netherlands | ||
| IW | WON | Wings Air | WINGS ABADI | Indonesia | Subsidiary of Lion Air |
| WAT | Wings Air Transport | Sudan | |||
| WAW | Wings Airways | WING SHUTTLE | United States | ||
| WOL | Wings Aviation | WINGJET | Guyana | ||
| WEX | Wings Express | WINGS EXPRESS | United States | ||
| WLB | Wings of Lebanon Aviation | WING LEBANON | Lebanon | ||
| WIN | Winlink | WINLINK | Saint Lucia | ||
| WAG | Wisconsin Air National Guard | United States | |||
| WSM | Wisman Aviation | WISMAN | United States | ||
| 8Z | WVL | Wizz Air Bulgaria | WIZZBUL | Bulgaria | defunct in 2011 |
| W6 | WZZ | Wizz Air | WIZZAIR | Hungary | |
| W4 | WMT | Wizz Air Malta | WIZZ AIR MALTA | Malta | |
| W9 | WUK | Wizz Air UK | WIZZ GO | United Kingdom | |
| WNR | Wondair on Demand Aviation | WONDAIR | Spain | ||
| CWY | Woodgate Aviation | CAUSEWAY | United Kingdom | ||
| WO | WOA | World Airways | WORLD | United States | |
| XWW | World Weatherwatch | Canada | |||
| WWM | World Wing Aviation | MANAS WING | Kyrgyzstan | ||
| 1P | Worldspan | United States | |||
| UI | CSW | SW Italia | SILKITALIA | Italy | |
| WWS | Worldwide Aviation Services | Pakistan | |||
| WWI | Worldwide Jet Charter | WORLDWIDE | United States | ||
| WW | WOW | WOW air | WOW air | Iceland | |
| WRT | Wright Airlines | WRIGHT-AIR | United States | defunct | |
| 8V | WRF | Wright Air Service | WRIGHT FLYER | United States | |
| CWU | Wuhan Airlines | WUHAN AIR | China | ||
| WYC | Wycombe Air Centre | WYCOMBE | United Kingdom | ||
| WYG | Wyoming Airlines | WYOMING | United States | ||
| KW | WAN | Wataniya Airways | WATANIYA | Kuwait | |
| 3W* | VNR | Wan Air | WANAIR | French Polynesia | defunct |
| WR | WEN | WestJet Encore | ENCORE | Canada | |
| XJE | X-Jet | Austria | |||
| XAB | Xabre Aerolineas | AERO XABRE | Mexico | ||
| XAE | Xair | AURA | Czech Republic | ||
| XJC | XJC Limited | EXCLUSIVE JET | United Kingdom | ||
| XER | Xerox Corporation | XEROX | United States | ||
| 7A | XRC | Express Air Cargo | TUNISIA CARGO | Tunisia | |
| MF | CXA | Xiamen Airlines | XIAMEN AIR | China | |
| CXJ | Xinjiang Airlines | XINJIANG | China | ||
| XJT | Xjet Limited | XRAY | United Kingdom | ||
| SE | SEU | XL Airways France | STARWAY | France | |
| GXL | XL Airways Germany | STARDUST | Germany | ||
| XOJ | XOJet | EXOJET | United States | ||
| XPS | XP International | XP PARCEL | Netherlands | ||
| Xpedite | BIGSPLASH | United Kingdom | |||
| XN | XAR | XpressAir | XPRESS | Indonesia | Renamed from Travel Express Aviation Services in 2012 |
| RAG | Xstrata Nickel (Raglan Mine) | RAGLAN | Canada | ||
| DGA | Yellow River Delta General Aviation | YELLOW RIVER | China | ||
| YRG | Yak Air | YAKAIR GEORGIA | Georgia | ||
| AKY | Yak-Service | YAK-SERVICE | Russia | ||
| YAK | Yakolev | YAK AVIA | Russia | Yak Design Bureau | |
| YL | LLM | Yamal Airlines | YAMAL | Russia | |
| R3 | SYL | Yakutia Airlines | AIR YAKUTIA | Russia | |
| CYG | Yana Airlines | VICAIR | Cambodia | ||
| AYG | Yangon Airways | AIR YANGON | Burma | ||
| Y8 | YZR | Suparna Airlines | YANGTZE RIVER | China | Former name: Yangtze River Express |
| LYH | Yankee Lima Helicopteres | HELIGUYANE | France | ||
| MHD | Yas Air Kish | YAS AIR | Iran | ||
| Y0 | EMJ | Yellow Air Taxi/Friendship Airways | United States | ||
| ELW | Yellow Wings Air Services | YELLOW WINGS | Kenya | ||
| IY | IYE | Yemenia | YEMENI | Yemen | |
| ERV | Yerevan-Avia | YEREVAN-AVIA | Armenia | ||
| YT | NYT | Yeti Airlines | YETI AIRLINES | Nepal | Domestic |
| YFS | Young Flying Service | YOUNG AIR | United States | ||
| AYU | Yuhi Air Lines | Japan | |||
| AYE | Yunnan Yingan Airlines | AIR YING AN | China | ||
| 4Y | TUD | Yute Air Alaska | TUNDRA | United States | defunct 2017 |
| UGN | Yuzhnaya Aircompany | PLUTON | Kazakhstan | ||
| 2N | UMK | Yuzhmashavia | YUZMASH | Ukraine | |
| BZE | Zenith Aviation | ZENSTAR | United Kingdom | 2014 [64] | |
| AZB | Zaab Air | ZAAB AIR | Ghana | ||
| AZJ | Zas Air | Egypt | |||
| AZR | Zenith Air | ZENAIR | South Africa | ||
| CDC | Zhejiang Loong Airlines | HUALONG | China | ||
| CIT | Zanesville Aviation | ZANE | United States | ||
| EMR | Zenmour Airlines | ZENMOUR | Mauritania | ||
| EZD | Zest Airways | ZEST AIRWAYS | Philippines | ||
| GZQ | Zagros Air | ZAGROS | Iraq | ||
| C4 | IMX | Zimex Aviation | ZIMEX | Switzerland | |
| IZG | Zagros Airlines | ZAGROS | Iran | ||
| JTU | Zhetysu | ZHETYSU | Kazakhstan | ||
| KVZ | Z-Aero Airlines | Ukraine | |||
| KZH | Zhez Air | Kazakhstan | |||
| MBG | Zephyr Aviation | CHALGROVE | United Kingdom | ||
| MLU | Zracno Pristaniste Mali Losinj | MALI LOSINJ | Croatia | ||
| MZE | Zenith Aviation (Malta) | Malta | |||
| ORZ | Zorex | ZOREX | Spain | ||
| PZY | Zapolyarye Airline Company | ZAPOLYARYE | Russia | ||
| RZR | Zephyr Express | RECOVERY | United States | ||
| RZU | Zhersu Avia | ZHERSU AVIA | Kazakhstan | ||
| SYZ | Zil Air | ZIL AIR | Seychelles | ||
| TAN | Zanair | ZANAIR | Tanzania | ||
| ZAI | Zaire Aero Service | ZASAIR | Democratic Republic of Congo | ||
| ZAK | Zambia Skyways | ZAMBIA SKIES | Zambia | ||
| ZAR | Zairean Airlines | ZAIREAN | Domocratic Republic of Congo | ||
| ZAV | Zetavia | ZETAVIA | Ukraine | ||
| ZAW | Zoom Airways | ZED AIR | Bangladesh | ||
| ZMA | Zambezi Airlines | ZAMBEZI WINGS | Zambia | ||
| RZV | Z-Avia | ZEDAVIA | Armenia | ICAO Code and callsign no longer allocated | |
| Q3 | MBN | Zambian Airways | ZAMBIANA | Zambia | |
| ZAN | Zantop International Airlines | ZANTOP | United States | ICAO Code and callsign no longer allocated | |
| ZAS | ZAS Airlines of Egypt | ZAS AIRLINES | Egypt | ICAO Code and callsign no longer allocated | |
| CJG | Zhejiang Airlines | ZHEJIANG | China | ICAO Code and callsign no longer allocated | |
| CFZ | Zhongfei General Aviation | ZHONGFEI | China | ||
| CYN | Zhongyuan Aviation | ZHONGYUAN | China | ICAO Code and callsign no longer allocated | |
| 3J | WZP | Zip | ZIPPER | Canada | ICAO Code and callsign no longer allocated |
| ZG | TZP | Zipair Tokyo | ZIPPY | Japan | Subsidiary of Japan Airlines |
| Z4 | OOM | Zoom Airlines | ZOOM | Canada | defunct, ICAO Code and callsign no longer allocated |
| ORZ | Zorex | ZOREX | Spain |
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