# List of airline codes (C)

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.

## Airline codes for airlines beginning with:

* All
* 0–9
* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z

## Codes

Airline codes :
| IATA | ICAO | Airline | Call sign | Country | Comments |
| VL | LHX | City Airlines | CITYAIR | Germany | LH subsidiary Allocated in 2023 |
| | 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 |
| | CBH | Corporate Eagle Management Services | CLUB HOUSE | United States | Allocated in 2014 |
| | CRF | Croix Rouge Francais | CROIX ROUGE | France | 2014 |
| | 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 | |
| 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 | |
| | CME | Commerce Bank | COMMERCE BANK | United States | (Kansas City) Allocated in 2014 |
| | 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 |
| | 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 | CORENDON EUROPE | 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 |