| 1 | CKL | Kokomo Aviation d/b/a Aviation Charter Services | Callsign: Circle City, Ceased operations. | USA | AVCODES |
| 2 | CKL | Cronos Airlines Benin | IATA: C9, Callsign: Space, | DY | AVCODES |
| 3 | CKL | Aviation Charter Services | | | ICAO1 |
| 4 | CKL | CTL Chemkol Sp. Z o.o. | | PL | VKM |
| 5 | CKLA | COOK, LAWRENCE A | | | SCAC3 |
| 6 | CKLC | CLEARTRACK | | | SCAC4 |
| 7 | CKLD | COOK, LEONARD | | | SCAC3 |
| 8 | CKLG | CHEROKEE LOGISTICS | | | SCAC4 |
| 9 | CKLH | COOKS LOBSTER HOUSE INC | | | SCAC4 |
| 10 | CKLI | COOK LOGISTICS LLC | | | SCAC4 |
| 11 | CKLJ | COPELAND, K L TRANSPORT | | | SCAC4 |
| 12 | CKLK | CLARK, MICHAEL A LOGISTICS INC | | | SCAC4 |
| 13 | CKLL | CLARK LEASING LTD | | | SCAC3 |
| 14 | CKLM | CRIST TRUCKING | | | SCAC4 |
| 15 | CKLN | CHEMIKALIEN SEETRANSPORT | | | SCAC3 |
| 16 | CKLN | CHEMIKALIEN SEETRANSPORT GMBH | | | SCAC4 |
| 17 | CKLO | CHECKER LOGISTICS INC | | | SCAC4 |
| 18 | CKLR | CLARKSVILLE REFRIGERATED LINES I LT | | | SCAC4 |
| 19 | CKLS | CHEROKEE LOGISTICS SYSTEMS INC | | | SCAC4 |
| 20 | CKLU | CEEKAY SHIPPING AND MARINE SERVICES LTD | | IND | BIC |
| 21 | CKLU | CEEKAY SHIPPING AND MARINE SERVICES | | | SCAC4 |
| 22 | CKLV | COOKE LIVESTOCK | | | SCAC4 |
| 23 | CKLY | CKLASS INTERNACIONAL | | | SCAC4 |
