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 | Comments |
|---|---|---|---|---|---|
| AU | CJL | Canada Jetlines | JETBUS | Canada | defunct |
| VL | LHX | City Airlines | CITYAIR | Germany | LH subsidiary Allocated in 2023 [1] |
| 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 [2] | |
| CBH | Corporate Eagle Management Services | CLUB HOUSE | United States | Allocated in 2014 [3] | |
| CRF | Croix Rouge Francais | CROIX ROUGE | France | 2014 [2] | |
| 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 | Burkina Faso | |||
| AWX | Civil Aviation Authority Directorate of Airspace Policy | ALLWEATHER | United Kingdom | ||
| BBN | Civil Aviation Authority Airworthiness Division | BRABAZON | United Kingdom | ||
| ATQ | CHC Helicopters Nigeria | COLIBRI | Nigeria | ||
| APL | Corporativo Aereo Principal | AEREO PRINCIPAL | Mexico | ||
| AIO | Chief of Staff, United States Air Force | AIR CHIEF | United States | ||
| AID | Christian Konig - Century Airbirds | CENTURY AIRBIRD | Austria | ||
| Cambridge Recurrent Training | CAMBRIDGE | United Kingdom | |||
| California Department of Forestry and Fire Protection | CALFIRE | United States | |||
| Careflight Queensland | SAMARITAN | Australia | |||
| Castle Air Charter | CASTLEFILM | United Kingdom | |||
| Challenges Aviation | TIGER | United Kingdom | |||
| Challenges Limited | HERITAGE | United Kingdom | |||
| Cheqair | ASTON | United Kingdom | |||
| Clacton Aero Club | CLASSIC WINGS | United Kingdom | |||
| Coral Sun Airways | CORAL SUN | Kiribati | |||
| Cowan Group | COWAN | United States | |||
| SMW | Carpatair Flight Service | SMART WINGS | Romania | Was Carpatair Flight Training | |
| CCL | Cambodia Airlines | ANGKOR WAT | Cambodia | ||
| KR | KME | Cambodia Airways | GIANT IBIS | Cambodia | |
| CCB | Caricom Airways | DOLPHIN | Barbados | ||
| CYH | China Southern Airlines Henan | YUHAO | China | ||
| CFB | Chongqing Forebase General Aviation | FOREBASE | China | ||
| XCA | Colt Transportes Aereos | COLT | Brazil | ||
| GCY | CHC Global Operations International | HELIBIRD | United Kingdom | ||
| AUN | Common Sky | COMMON SKY | Austria | ||
| CBI | Cabi | CABI | Ukraine | ||
| CPI | Compagnia Aeronautica Italiana | AIRCAI | Italy | ||
| 5C | ICL | Challenge Airlines IL | CAL | Israel | ex CAL-Cargo Air Lines |
| CMR | CAM Air Management | CAMEO | United Kingdom | ||
| CTZ | CATA Línea Aérea | CATA | Argentina | ||
| CCF | CCF Manager Airline | TOMCAT | Germany | ||
| CED | CEDTA (Compañía Ecuatoriana De Transportes Aéreos) | CEDTA | Ecuador | ||
| HBI | CHC Denmark | HELIBIRD | Denmark | ||
| HEM | CHC Helicopter | HEMS | Australia | ||
| AW | SCH | CHC Airways | SCHREINER | Netherlands | formerly Schreiner Airways. ICAO code in use by another company, call sign no longer allocated |
| HKS | CHC Helikopter Service | HELIBUS | Norway | ||
| VCI | CI-Tours | CI-TOURS | Ivory Coast | ||
| CKC | CKC Services | United States | |||
| CMZ | CM Stair | CEE-EM STAIRS | Mauritania | ||
| CNT | Centre national d'études des télécommunications - C.N.E.T. | KNET | France | ||
| OAP | COAPA AIR | COAPA | Mexico | ||
| PDR | COMAV | SPEEDSTER | Namibia | ||
| CRH | CRI Helicopters Mexico | HELI-MEX | Mexico | ||
| IRO | CSA Air | IRON AIR | United States | ||
| CSE | CSE Aviation | OXFORD | United Kingdom | ||
| CTQ | CTK Network Aviation | CITYLINK | Ghana | ||
| CBR | Cabair College of Air Training | CABAIR | United Kingdom | ||
| CVE | Cabo Verde Express | KABEX | Cape Verde | ||
| CWD | Caernarfon Airworld | AMBASSADOR | United Kingdom | ||
| CXE | Caicos Express Airways | CAICOS | Turks and Caicos Islands | ||
| CCE | Cairo Air Transport Company | Egypt | |||
| CGC | Cal Gulf Aviation | CAL-GULF | São Tomé and Príncipe | ||
| REZ | Cal-West Aviation | CAL AIR | United States | ||
| CSL | California Air Shuttle | CALIFORNIA SHUTTLE | United States | ||
| 3C | CMV | Calima Aviación | CALIMA | Spain | |
| MO | CAV | Calm Air | CALM AIR | Canada | |
| R9 | CAM | Camai Air | AIR CAMAI | United States | Village Aviation |
| K6 | KHV | Cambodia Angkor Air | ANGKOR AIR | Cambodia | |
| UY | UYC | Cameroon Airlines | CAM-AIR | Cameroon | defunct |
| HSO | Campania Helicopteros De Transporte | HELIASTURIAS | Spain | ||
| C6 | CJA | CanJet | CANJET | Canada | |
| PIL | Canada Jet Charters | PINNACLE | Canada | ||
| CP | CDN | Canadian Airlines | CANADIAN | Canada | defunct |
| CTG | Canadian Coast Guard | CANADIAN COAST GUARD | Canada | ||
| HIA | Canadian Eagle Aviation | HAIDA | Canada | ||
| CFC | Canadian Forces | CANFORCE | Canada | ||
| BZD | Canadian Global Air Ambulance | BLIZZARD | Canada | ICAO Code and callsign no longer allocated | |
| CDN | Canadian Helicopters | CANADIAN | Canada | ||
| TKR | Canadian Interagency Forest Fire Centre | TANKER | Canada | ICAO Code and callsign no longer allocated | |
| XNC | Canadian National Telecommunications | Canada | ICAO Code and callsign no longer allocated | ||
| 7F | AKT | Canadian North | ARCTIC | Canada | Air Norterra |
| CP | CPC | Canadian Pacific Airlines | EMPRESS | Canada | ICAO Code and callsign no longer allocated |
| CDR | Canadian Regional Airlines | CANADIAN REGIONAL | Canada | ICAO Code and callsign no longer allocated | |
| CWH | Canadian Warplane Heritage Museum | WARPLANE HERITAGE | Canada | ||
| W2 | CWA | Canadian Western Airlines | CANADIAN WESTERN | Canada | |
| CWW | Canair | CANAIR | China | ||
| CUI | Cancun Air | CAN-AIR | Mexico | ||
| 9K | KAP | Cape Air | CAIR | United States | |
| CTO | Cape Air Transport | Australia | |||
| SEM | Cape Central Airways | SEMO | United States | ||
| CMY | Cape Smythe Air | CAPE SMYTHE AIR | United States | ||
| CPX | Capital Air Service | CAPAIR | United States | ||
| CPD | Capital Airlines | CAPITAL DELTA | Kenya | ||
| NCP | Capital Airlines Limited | CAPITAL SHUTTLE | Nigeria | ||
| PT | CCI | Capital Cargo International Airlines | CAPPY | United States | Allocation deleted 2013 |
| CCQ | Capital City Air Carriers | CAP CITY | United States | ||
| EGL | Capital Trading Aviation | PRESTIGE | United Kingdom | ||
| CEX | Capitol Air Express | CAPITOL EXPRESS | United States | ||
| CWZ | Capitol Wings Airline | CAPWINGS | United States | ||
| VAN | Caravan Air | CAMEL | Mauritania | ||
| CWN | Cardiff Wales Flying Club | CAMBRIAN | United Kingdom | ||
| FVA | Cardinal/Air Virginia | AIR VIRGINIA | United States | ||
| GOL | Cardolaar | CARGOLAAR | Namibia | ||
| CDI | Cards Air Services | CARDS | Philippines | ||
| CFH | CareFlight | CARE FLIGHT | Australia | ||
| CDM | Carga Aérea Dominicana | CARGA AEREA | Dominican Republic | ||
| EST | Carga Express Internacional | CARGAINTER | Mexico | ||
| GG | GGC | Cargo 360 | LONG-HAUL | United States | |
| MCX | Cargo Express | MAURICARGO | Mauritania | ||
| CRV | Cargo Ivoire | CARGOIV | Ivory Coast | ||
| CLM | Cargo Link (Caribbean) | CARGO LINK | Barbados | ||
| P3 | CLU | Cargo Logic Air | FIREBIRD | United Kingdom | |
| CTW | Cargo Three | THIRD CARGO | Panama | ||
| 2G | CRG | Cargoitalia | WHITE PELICAN | Italy | |
| W8 | CJT | Cargojet Airways | CARGOJET | Canada | |
| CV | CLX | Cargolux | CARGOLUX | Luxembourg | |
| C8 | ICV | Cargolux Italia | CARGO MED | Italy | |
| CGM | Cargoman | HOTEL CHARLIE | Oman | ||
| DEL | Carib Aviation | RED TAIL | Antigua and Barbuda | ||
| BCB | Carib Express | WAVEBIRD | Barbados | ||
| PWD | CARIBAIR | CARIBAIR | Dominican Republic | ||
| DCC | Caribbean Air Cargo | CARICARGO | Barbados | ||
| CLT | Caribbean Air Transport | CARIBBEAN | Netherlands | ICAO Code and callsign no longer allocated | |
| CLT | Club Aerocelta de Vuelo Con Motor | Spain | |||
| BW | BWA | Caribbean Airlines | CARIBBEAN AIRLINES | Trinidad and Tobago | |
| IQQ | Caribbean Airways | CARIBJET | Barbados | ||
| CSX | Choice Airways | CHOICE AIR | United States | ||
| TLC | Caribbean Express | CARIB-X | United States | ||
| 8B | GFI | Caribbean Star Airlines | CARIB STAR | Antigua and Barbuda | |
| CRB | Caricom Airways | CARIBBEAN COMMUTER | Suriname | ||
| CRT | Caribintair | CARIBINTAIR | Haiti | ||
| CVG | Carill Aviation | CARILL | United Kingdom | ||
| V3 | KRP | Carpatair | CARPATAIR | Romania | |
| CRR | Carranza | CARRANZA | Chile | defunct | |
| ULS | Carroll Air Service | ULSTER | United States | ||
| CMT | Casement Aviation | CASEMENT | United States | ||
| CSO | Casino Airline | CASAIR | United States | ||
| CSP | Casper Air Service | CASPER AIR | United States | ||
| RV | CPN | Caspian Airlines | CASPIAN | Iran | |
| CSJ | Castle Aviation | CASTLE | United States | ||
| CAZ | Cat Aviation | EUROCAT | Switzerland | ||
| CBT | Catalina Flying Boats | CATALINA AIR | United States | ||
| TEX | Catex | CATEX | France | ||
| KA | HDA | Cathay Dragon | DRAGON | Hong Kong | defunct IATA Code transferred to Aero Nomad Airlines |
| CX | CPA | Cathay Pacific | CATHAY | Hong Kong | |
| CJR | Caverton Helicopters | CAVERTON AIR | Nigeria | ||
| KX | CAY | Cayman Airways | CAYMAN | Cayman Islands | |
| 5J | CEB | Cebu Pacific | CEBU | Philippines | |
| CIL | Cecil Aviation | CECIL | United Kingdom | ||
| CEG | Cega Aviation | CEGA | United Kingdom | ||
| CEC | Celtic Airways | CELTAIR | United Kingdom | ||
| CWE | Celtic West | CELTIC | United Kingdom | ||
| CEV | Centre d'Essais en Vol | CENTEV | France | ||
| CNL | Centennial Airlines | WYO-AIR | United States | ||
| CNS | Cobalt Air LLC | CHRONOS | United States | ||
| CVO | Center Vol | CENTERVOL | Spain | ||
| CTS | Center-South | CENTER-SOUTH | Russia | ||
| CET | Centrafrican Airlines | CENTRAFRICAIN | Central African Republic | ||
| CAX | Central Air Express | CENTRAL EXPRESS | Democratic Republic of the Congo | ||
| CTL | Central Airlines | CENTRAL COMMUTER | United States | ||
| CNY | Central Airways | CENTRAL LEONE | Sierra Leone | ||
| ACN | Central American Airlines | AEROCENTRO | Nicaragua | ||
| YOG | Central Aviation | YOGAN AIR | United States | ||
| DRN | Central De Discos De Reynosa | DISCOS REYNOSA | Mexico | ||
| 2C | CMA | CMA-CGM AIRCARGO | FRENCH CARGO | France | |
| CHA | Central Flying Service | CHARTER CENTRAL | United States | ||
| CEM | Central Mongolia Airways | CENTRAL MONGOLIA | Mongolia | ||
| 9M | GLR | Central Mountain Air | GLACIER | Canada | |
| CQC | Central Queensland Aviation College | Australia | |||
| CSI | Central Skyport | SKYPORT | United States | ||
| CLW | Centralwings | CENTRALWINGS | Poland | ||
| DTV | Centre Airlines | DUTCH VALLEY | United States | ||
| CGS | Centre of Applied Geodynamica | GEO CENTRE | Russia | ||
| J7 | CVC | Centre-Avia | AVIACENTRE | Russia | |
| CCV | Centro De Helicopteros Corporativos | HELICORPORATIVO | Mexico | ||
| ACF | Centro de Formación Aeronáutica de Canarias | FORCAN | Spain | ||
| WE | CWC | Centurion Air Cargo | CHALLENGE CARGO | United States | |
| URY | Century Aviation | CENTURY AVIA | Mexico | ||
| HAI | Century Aviation International | Canada | |||
| XAD | Certified Air Dispatch | United States | |||
| CER | Cetraca Aviation Service | CETRACA | Democratic Republic of the Congo | ||
| IRU | Chabahar Airlines | CHABAHAR | Iran | ||
| CS | CSW | 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 | [2] | |
| CME | Commerce Bank | COMMERCE BANK | United States | (Kansas City) Allocated in 2014 [4] | |
| 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 [5] | |
| 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 |
| 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 | |
| XR | CXI | Corendon Airlines Europe | TOURISTIC | Malta | Touristic Aviation |
| 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 |