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 | |
| ZQ | 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 | ||
| ED* | ABQ | Airblue | PAKBLUE | 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 [9] | 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 | Aviaxess | AXAVIA | France | ||
| 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. [10] ICAO code in use by another company. [11] | |
| 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 | [12] |
| 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 | |
| MSC | 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 [13] | |
| 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 [14] |
| 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 |
| 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 [13] | |
| OUF | Beijing Eofa International Jet | ELEMENT | China | 2014 [13] | |
| 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 [15] |
| 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 [16] | |
| CBH | Corporate Eagle Management Services | CLUB HOUSE | United States | Allocated in 2014 [17] | |
| CRF | Croix Rouge Francais | CROIX ROUGE | France | 2014 [16] | |
| 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 |
| 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 | [16] | |
| CME | Commerce Bank | COMMERCE BANK | United States | (Kansas City) Allocated in 2014 [18] | |
| 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 [19] | |
| 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 [16] | ||
| 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 [20] | |
| DPJ | Delta Private Jets | JET CARD | United States | Changed from ELJ/ELITE JET in 2014 [21] | |
| DJR | Desert Jet | DESERT FLIGHT | United States | ||
| DLA | Air Dolomiti | DOLOMITI | Italy | ||
| DLC | Dehong South Asian General Aviation | SOARCOPTER | China | Was Ruili Jingcheng Helicopters | |
| 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 [21] | |
| 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 [22] | ||
MQ | ENY | Envoy Air | ENVOY | United States | 2014 [22] |
| ENK | Executive Airlink | SUNBIRD | United States | Allocated in 2014 [23] | |
| 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 [22] | ||
| 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 | ||
| EMU | East Asia Airlines | 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 [24] | |
| 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 | [22] | |
| 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 | [25] | |
| 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 [26] | |
| 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 [27] [28] | 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 | |
| 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 [29] | |
| 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 [30] | |
| 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 [31] | |
| 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 [32] | Thailand | holding airline, renamed on his accession [33] |
| 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 [34] |
| IWL | Island Wings | Bahamas | 2014 [34] | ||
| IK | KAR | Ikar | IKAR | Russian Federation | |
| ICN | Iconair | Pakistan | |||
| IAC | Interaviation Charter | 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 [34] | ||
| 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 [35] | |
| 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 [36] |
| IAX | International Air Services | INTERAIR SERVICES | Liberia | ||
| 6I | IBZ | International Business Air | INTERBIZ | Sweden | was U5 |
| 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 | Was B9 |
| EP | IRC | Iran Aseman Airlines | ASEMAN | Iran | |
| IRB | Iranair Tours | 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, [37] 2023 [38] | |
| JNY | Journey Aviation | ROCKBAND | United States | 2023: Callsign "ROCKBAND"; [38] Former Call Sign/Telephony Designator: UNIJET-ROCKBAND (2014 [37] ) | |
| JKR | Justice Air Charter | JOKER | United States | Trading name for Reliant Aviation, allocated in 2014 [39] | |
| 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 [38] | |
| JSS | Jet Stream International | Pakistan | 2023 [38] | ||
| JTF | Jet Time | JETFIN | Finland | 2014, [37] 2023 [38] | |
| 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 | |
| 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 [38] |
| 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 |
| 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 [40] | 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 | ||
| LV | LVL | Level | LEVEL | Spain and France | |
| 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 [41] | |
| HOG | Mahogany Air Charters | HOGAN AIR | Zambia | 2014 [42] | |
| MTS | Med Jets | MED SERVICE | Mexico | 2014 [42] | |
| MSF | Minsheng International Jet | MEINSHENG | China | 2014 [42] | |
| MXS | Millon Express | MILLON EXPRESS | United States | Trading name for Sunrise Airlines allocated in 2014 [43] | |
| MHF | Maritime Helicopters | AIR MARITIME | United States | Allocated 2014 [44] | |
| 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 [45] | |
| 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 | ||
| JTE | National Jet Express | JETEX | Australia | ||
| AND | National Jet Service | AIR INDIANA | United States | ||
| NC | NJS | National Jet Systems | NATIONAL JET | Australia | |
| 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 | ||
| 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 [46] | |
| 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 | |
| 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 [46] | |
| 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) [47] |
| 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) [48] |
| DH | NAN | Norwegian Air Norway | NORSHIP | Norway | subsidiary of Norwegian Air Shuttle |
| 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 [49] | |
| 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 [50] | |
| NCT | Pete Air | PETE AIR | Thailand | 2014 [51] | |
| PRT | Prime Service Italia | PRIME ITALIA | Italy | 2014 [51] | |
| PXT | Pacific Coast Jet | PACK COAST | United States | Allocated in 2014 [52] | |
| 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 [51] | |
| 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 [51] | |
| 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 | [53] |
| 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 Fliyng 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 [54] | |
| 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 | ||
| 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 [55] |
| 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 | ||
| 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 [55] | ||
| 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 [55] | ||
| 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 [55] | ||
| 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 [55] |
| 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 [56] | |
| SEN | Servicios de Aviacion Sierra | SERVISIERRA | Mexico | 2014 [56] | |
| SGC | SGC Aviation | SAINT GEORGE | Austria | 2014 [56] | |
| SCJ | Siamjet Aviation | SIAMJET | Thailand | 2014 [56] | |
| SIX | Sixt Rent A Car | DRIVE ORANGE | United States | 2014 [56] | |
| SOG | Solenta Aviation Ghana | Ghana | 2014 [56] | ||
| QSR | SR Jet | SPARKLE ROLL | China | 2014 [56] | |
| KBN | Spiracha Aviation | KABIN | Thailand | 2014 [56] | |
| CBN | Southern Illinois University as "Aviation Flight" | CARBONDALE | United States | Allocated in 2014 [57] | |
| IBG | Springfield Air | ICE BRIDGE | United States | Allocated 2014 [58] | |
| BZQ | Seneca College | STING | Canada | Allocated 2014 [59] | |
| 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 | ||
| 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 | ||
| 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 [56] |
| 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 | ||
| 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 [60] | 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. [61] | |
| 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 | OZW | Virgin Australia Regional Airlines | VELOCITY | 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 | [62] | |
| 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 | [63] | |
| 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 | ||
| LS | EXS | Jet2 | Channex | United Kingdom | Started in 1983 |
| 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 [64] | |
| UCG | Uniworld Air Cargo | UNIWORLD | Panama | 2014 [64] | |
| CUH | Urumqi Airlines | LOULAN | China | 2014 [64] | |
| 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 [64] | |
| 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 [65] | |
| 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 | ||
| PT | SWN | West Air 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 [66] | |
| 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 [67] | |
| 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 |
GainJet is a private charter airline and management company with its headquarters in Glyfada, Greece.
Alitalia CityLiner S.p.A. was an Italian regional airline and a subsidiary of Alitalia. It maintained two bases at Leonardo da Vinci–Fiumicino Airport in Rome and at Linate Airport in Milan. The airline operated short haul domestic and international point to point flights using Embraer E-Jet aircraft on behalf of its parent. The airline was a SkyTeam affiliate member through its parent company. It was originally founded by Air One that merged with Alitalia in 2009 and was subsequently renamed.