| C-Air | CEE | ||
| C-S Aviation Services | |||
| Cabi Airlines | CBI | ||
| CAL Cargo Airlines | 5C | ICL | 700 |
| Caledonian Airways | KT | CKT | |
| Calm Air International ltd | MO | CAV | 622 |
| Cameroon Airlines | UY | UYC | 604 |
| Canadian Airlines International | CP | CDN | 018 |
| Canadian North Cargo | 5T | ANX | 518 |
| Canadian Regional Airlines | CDR | ||
| CanAir Cargo | WW | CWW | |
| Canjet Airlines | CJA | ||
| Cape Air | 9K | KAP | 306 |
| Capital Cargo International Airlines | PT | CCI | |
| Capitol Air Express | CE | CEX | |
| Caravanair | VAN | ||
| Cargo Air | 11 | VEA | |
| Cargo Air Company of Azal | J2 | AHC | |
| Cargo B | |||
| Cargo d´Or | 7G | CDO | 513 |
| Cargo Lion/Translux Int´l Airline | TLX | ||
| Cargo Plus Aviation | 8L | CGP | |
| Cargoitalia | 2G | CRG | 002 |
| Cargojet Airways | W8 | CJT | 489 |
| Cargolux Airlines | CV | CLX | 172 |
| Cargosur | OW | OWS | |
| Carib Express | BCB | ||
| Caribbean Air Cargo | DC | DCC | |
| Caribbean Airlines | BW | BWA | 106 |
| Caribbean Flights | CIF | ||
| Caribbean Star Airlines | 8B | GFI | |
| CaribEx | TLC | ||
| Carpatair | V3 | KRP | 021 |
| Casino Express | XP | CXP | |
| Caspian Air Lines | RV | CPN | 879 |
| CAT Cargo Air Transport | DZ | KET | |
| Cathay Pacific Airways | CX | CPA | 160 |
| Cayman Airways | KX | CAY | 378 |
| CCAIR (USAirExpress) | ED | CDL | 354 |
| CCI | CCX | ||
| Cebu Pacific Air | 5J | CPI | 203 |
| Centennial Airlines | BE | CNA | |
| Centrafrican Airlines | GC | CET | |
| Central Airlines | CTL | ||
| Central Districts Airline | CDS | ||
| Central Mountain Air | 9M | GLR | 634 |
| Centralwings | C0 | CLW | |
| Centre-Avia Airlines | J7 | CVC | 601 |
| Centurion Air Cargo | WE | CWC | 307 |
| Century Airlines | CTY | ||
| Challengair | CHG | ||
| Champagne Airlines | CPH | ||
| Champion Air | MG | CCP | |
| Chanchangi Airlines | 3U | NCH | |
| Chang´an Airlines | 2Z | CGN | |
| Changzhou Jiangnan GAC | |||
| Chauffair | CFR | ||
| Chautauqua Airlines Inc (USAir Express) | US | CHQ | 363 |
| Cheboksary Air Enterprise | CBK | ||
| Chelyabinsk Air Enterprise | H6 | CHB | |
| Cherokee Express | CBM | ||
| Cherry-Air | CCY | ||
| Chicago Express Airlines | C8 | WDY | 488 |
| China Air Cargo | |||
| China Airlines | CI | CAL | 297 |
| China Cargo Airlines | CK | CKK | 112 |
| China Eastern Airlines | MU | CES | 781 |
| China Express Airlines | G5 | HXA | |
| China Flying Dragon Aviation | CFA | ||
| China General Aviation | CTH | ||
| China National Aviation Corporation | CAG | ||
| China Northern Airlines | CJ | CBF | 782 |
| China Northwest Airlines | WH | CNW | 783 |
| China Postal Airlines | PO | CYZ | |
| China Southern Airlines | CZ | CSN | 784 |
| China Southwest Airlines | SZ | CXN | 785 |
| China United Airlines | CUA | ||
| Chita Avia | X7 | CHF | 637 |
| Cielos Airlines | A2 | CIU | 529 |
| Cimber Air A/S | QI | CIM | 647 |
| Cirrus Airlines | C9 | RUS | 251 |
| Cirrusair | NTS | 595 | |
| CIS Express Airlines | CIS | ||
| City Bird Airlines | H2 | CTB | |
| City Star Airlines | X9 | ISL | |
| Cityflyer | FD | CFE | 844 |
| Cityjet | WX | BCY | 689 |
| CLA Air Transport | C9 | ||
| ClassicAir Aviation Services | |||
| Click Airways | C4 | CGK | 094 |
| CNG Transavia | CGT | ||
| Coast Air AS | BX | CST | 970 |
| Coastal Air Transport | DQ | CXT | 457 |
| Comair - Delta Connection | OH | COM | 886 |
| Commutair | UCA | ||
| Comores Aviation | KR | KMZ | |
| Compagnie Aerienne du Mali | I5 | CMM | |
| Compagnie Aeronautique Europeenne | FEU | ||
| Compagnie Corse Mediterranee | XK | CCM | 146 |
| Compass Airlines | CYM | 612 | |
| Conair Aviation | CRC | ||
| Condor | DE | CFG | 881 |
| Connect Air | YF | FUJ | |
| Contact Air | KIS | ||
| Conti-Flug | DD | EPC | |
| Continental Airlines | CO | COA | 005 |
| Continental Airways | PC | PVV | 922 |
| Continental Aviation/Analinda | CCL | ||
| Continental Cargo Airlines | |||
| Continental Express | BTA | ||
| Continental Micronesia | CS | CMI | 596 |
| Contract Air Cargo | TSU | ||
| Conviasa | V0 | VCV | |
| COPA Airlines | CM | CMP | 230 |
| Corendon Airlines | CAI | ||
| Corporate Air | DN | CPT | |
| Corporate Express | IFL | ||
| Corsair | SS | CRL | 923 |
| Cosmic Air | F5 | COZ | 447 |
| Coyne Airways | 7C | COY | 575 |
| Crimea Air | OR | CRF | 107 |
| Croatia Airlines | OU | CTN | 831 |
| Cronus Airlines | X5 | CUS | |
| Cruizeiro (Servicos Aereos Cr. Do Sol) | SC | CRZ | |
| CSA Air | IRO | ||
| Cubana | CU | CUB | 136 |
| Custom Air Transport | DG | CTT | 373 |
| Cyprus Airways | CY | CYP | 048 |
| Cyprus Turkish Airlines | YK | YVK | 056 |
| Czech Airlines | OK | CSA | 064 |