Airlines
| Airline | IATA | ICAO | Country |
|---|---|---|---|
| Buffalo Airways | J4 | BFL | Canada |
| Bul Air | LB | BVL | Bulgaria |
Bulgaria Air
|
FB | LZB | Bulgaria |
| Businesswings | – | JMP | Germany |
| Buzz | RR | RYS | Poland |
| C&M Airways | – | RWG | United States |
Cabo Verde Express
|
– | CVE | Cape Verde |
| Caicos Express Airways | 9Q | CXE | United Kingdom |
| Cairo Aviation | OE | CCE | Egypt |
| CALAFIAAIRLINES | A7 | CFV | Mexico |
| Calima Aviacion | XG | CLI | Spain |
| Calm Air | MO | CAV | Canada |
| Camair-Co | QC | CRC | Cameroon |
| Cambodia Airways | KR | KME | Cambodia |
| Cambodia Bayon Airlines | BD | BYC | Cambodia |
| Canadian Helicopters | – | CHL | Canada |
| Canadian National Airways | CN | YCP | Canada |
| Canadian North | 5T | MPE | Canada |
| Canaryfly | PM | CNF | Spain |
| CanXplorer | C2 | CAP | Canada |
| CanXpress | C1 | – | Canada |
| Cape Air | 9K | KAP | United States |
| Cardig Air | 8F | CAD | Indonesia |
| CareFlight | – | CFH | Australia |
Cargo Air
|
– | CGF | Bulgaria |
| Cargojet | W8 | CJT | Canada |
| CargoLogicAir | P3 | CLU | United Kingdom |
| Cargolux | CV | CLX | Luxembourg |
| Cargolux Italia | C8 | ICV | Italy |
| Caribair | B9 | CBC | Dominican Republic |
Caribbean Airlines
|
BW | BWA | Trinidad & Tobago |
| Caricom Airways | – | CRB | Suriname |
| CARICOM AIRWAYS (BARBADOS) INC. | – | CCB | Barbados |
| Carpatair | V3 | KRP | Romania |
| Carpatair Flight Training | – | SMW | Romania |
| Caspian Airlines | RV | CPN | Islamic Republic of Iran |
| Caspiy | – | TLG | Kazakhstan |
| Castle Aviation | – | CSJ | United States |
| Cat Aviation | – | CAZ | Switzerland |
| Cat Island Air | – | CIS | Bahamas |
| Cathay Pacific | CX | CPA | China |
| Caucasus Airlines | NS | SRJ | Georgia |
CAVOK Air
|
– | CVK | Ukraine |
| Cayman Airways | KX | CAY | United Kingdom |
| CB Airways UK ( Interliging Flights ) | 1F | CIF | United Kingdom |
| CBM America | – | XBM | United States |
| CCML Airlines | CB | CCC | Colombia |
Cebu Pacific
|
5J | CEB | Philippines |
| CEIBA Intercontinental | C2 | CEL | Equatorial Guinea |
| Cello Aviation | – | CLJ | United Kingdom |
| CemAir | 5Z | KEM | South Africa |
| Centavia | 7N | CNA | Serbia |
| Central Connect Airlines | 3B | JBR | Czechia |
| Central Connect Airlines | – | CCG | Czechia |
| Central Mountain Air | 9M | GLR | Canada |
| Centreline Air Charter Ltd | – | CLF | United Kingdom |
| Centurion Air Cargo | WE | CWC | United States |
Chabahar Airlines
|
– | IRU | Islamic Republic of Iran |
| Chalair Aviation | CE | CLG | France |
| Challenge Aero | – | CHG | Ukraine |