| 8401 | CKIE | CIRCLE KB INDUSTRIES | | | SCAC4 |
| 8402 | CKIG | CARR, DON TRUCKING | | | SCAC3 |
| 8403 | CKIG | COLT TRUCKING | | | SCAC4 |
| 8404 | CKIL | COTA TRUCKING | | | SCAC3 |
| 8405 | CKIN | Chesapeake and Indiana R.R. Co., Inc. | added 10/2004; 7/2005; eliminated 4/2006 | | NAKINA |
| 8406 | CKIN | CHESAPEAKE & INDIANA RAILROAD CO., INC. | | | PWRC |
| 8407 | CKIN | Chesapeake and Indiana Railroad | | | RSRV |
| 8408 | CKIN | COOK INLET PIPE LINE COMPANY | | | SCAC3 |
| 8409 | CKIN | CHESAPEAKE AND INDIANA RAILROAD COM | | | SCAC4 |
| 8410 | CKIR | COOK INTERSTATE TRANSPORTATION INC | | | SCAC3 |
| 8411 | CKIS | C & S TRUCKING INC | | | SCAC4 |
| 8412 | CKIT | CALKINS TRUCKING INC | | | SCAC3 |
| 8413 | CKIT | CALKINS TRANSPORTATION INC | | | SCAC4 |
| 8414 | CKIX | C.K. Industries, Inc. | added 10/2000; 7/2005 | | NAKINA |
| 8415 | CKIX | Cook Industries, Inc. | added 7/1975; eliminated 4/1978 | | NAKINA |
| 8416 | CKIX | Cook Industries, Inc. | added 7/75; eliminated 4/78 | | NRHS |
| 8417 | CKIX | C.K. Industries, Inc. | added 10/2000 | | NRHS |
| 8418 | CKIX | *COOK INDUSTRIES, INC. | | | PWRC |
| 8419 | CKIX | +C. K. INDUSTRIES, INC. | | | PWRC |
| 8420 | CKIX | C.K. Industries | | | RSRV |
| 8421 | CKIX | CK INDUSTRIES INC | | | SCAC4 |
| 8422 | CKJ | People's Liberation Army Air Force | Callsign: PLAAF, | PRC | AVCODES |
| 8423 | CKJC | COOK, JAMES C | | | SCAC3 |
| 8424 | CKJH | COOK, JOHN W | | | SCAC4 |
| 8425 | CKJI | CKJ TRUCKING INC | | | SCAC4 |
| 8426 | CKJS | COOK, J S CONTRACTING LTD | | | SCAC4 |
| 8427 | CKJT | CLARK, JIM TRUCKING | | | SCAC3 |
| 8428 | CKJW | CLARK, JOHN W OIL CO INC | | | SCAC4 |
| 8429 | CKJX | CRACKLIN J DEMOLITION & RECYCLING L | | | SCAC4 |
| 8430 | CKK | China Cargo Airlines Ltd. | IATA: CK, Callsign: China King, IATA Prefix: 112, IATA designator changed from 2J* / ICAO designator changed from CHY, Callsign changed from Cargo China | PRC | AVCODES |
| 8431 | CKK | China Cargo Airlines | IATA: CK | | ICAO1 |
| 8432 | CKK | China Cargo Airlines | | PRC | TRAFFIC |
| 8433 | CKKG | CLARK TRUCKING LINES LTD | | | SCAC3 |
| 8434 | CKKG | CLARK TRUCKING LINES (1983) LTD | | | SCAC4 |
| 8435 | CKKI | C & K TRUCKING LLC | | | SCAC4 |
| 8436 | CKKL | CLARK, KEN LLC | | | SCAC4 |
| 8437 | CKKN | CLARK, LONNIE TRUCKING | | | SCAC3 |
| 8438 | CKKN | CLARK TRUCKING | | | SCAC4 |
| 8439 | CKKQ | CLARK & CLARK LTD | | | SCAC3 |
| 8440 | CKKX | Columbia Conserve Co. | 7/1935 | | NAKINA |
| 8441 | CKL | Kokomo Aviation d/b/a Aviation Charter Services | Callsign: Circle City, Ceased operations. | USA | AVCODES |
| 8442 | CKL | Cronos Airlines Benin | IATA: C9, Callsign: Space, | DY | AVCODES |
| 8443 | CKL | Aviation Charter Services | | | ICAO1 |
| 8444 | CKL | CTL Chemkol Sp. Z o.o. | | PL | VKM |
| 8445 | CKLA | COOK, LAWRENCE A | | | SCAC3 |
| 8446 | CKLC | CLEARTRACK | | | SCAC4 |
| 8447 | CKLD | COOK, LEONARD | | | SCAC3 |
| 8448 | CKLG | CHEROKEE LOGISTICS | | | SCAC4 |
| 8449 | CKLH | COOKS LOBSTER HOUSE INC | | | SCAC4 |
| 8450 | CKLI | COOK LOGISTICS LLC | | | SCAC4 |
| 8451 | CKLJ | COPELAND, K L TRANSPORT | | | SCAC4 |
| 8452 | CKLK | CLARK, MICHAEL A LOGISTICS INC | | | SCAC4 |
| 8453 | CKLL | CLARK LEASING LTD | | | SCAC3 |
| 8454 | CKLM | CRIST TRUCKING | | | SCAC4 |
| 8455 | CKLN | CHEMIKALIEN SEETRANSPORT | | | SCAC3 |
| 8456 | CKLN | CHEMIKALIEN SEETRANSPORT GMBH | | | SCAC4 |
| 8457 | CKLO | CHECKER LOGISTICS INC | | | SCAC4 |
| 8458 | CKLR | CLARKSVILLE REFRIGERATED LINES I LT | | | SCAC4 |
| 8459 | CKLS | CHEROKEE LOGISTICS SYSTEMS INC | | | SCAC4 |
| 8460 | CKLU | CEEKAY SHIPPING AND MARINE SERVICES LTD | | IND | BIC |
| 8461 | CKLU | CEEKAY SHIPPING AND MARINE SERVICES | | | SCAC4 |
| 8462 | CKLV | COOKE LIVESTOCK | | | SCAC4 |
| 8463 | CKLY | CKLASS INTERNACIONAL | | | SCAC4 |
| 8464 | CKM | Rivaflecha S.L. (BKS Air) | Callsign: Cosmos, | E | AVCODES |
| 8465 | CKM | BKS Air (Rivaflecha) | | | ICAO1 |
| 8466 | CKMA | CLARK, MICHAEL A TRUCKING INC | | | SCAC3 |
| 8467 | CKMA | CLARK, MICHAEL A TRUCKING INC | | | SCAC4 |
| 8468 | CKMC | CLARK MOTOR CO INC | | | SCAC3 |
| 8469 | CKME | CKM EXPRESS CO | | | SCAC3 |
| 8470 | CKME | CHEROKEE MARINE TERMINAL | | | SCAC4 |
| 8471 | CKMF | CEE KAY MOTOR FREIGHT INC | | | SCAC3 |
| 8472 | CKMG | CIRKERS MOVING & STORAGE CO INC | | | SCAC3 |
| 8473 | CKMG | COOK/TAMPA BAY MOVING SYSTEMS INC | | | SCAC4 |
| 8474 | CKMH | COOK MOVING SYSTEMS INC | | | SCAC3 |
| 8475 | CKMI | CLACKUMS TRANSFER | | | SCAC3 |
| 8476 | CKMI | CK MANUFACTURING/INDUSTRIAL CONCEPT | | | SCAC4 |
| 8477 | CKMJ | CLICK MESSENGER SERVICE OF NY | | | SCAC3 |
| 8478 | CKMK | CHICKEN MARKET INC | | | SCAC3 |
| 8479 | CKML | COOK MAIL SERVICE | | | SCAC3 |
| 8480 | CKML | CREEKMORE | | | SCAC4 |
| 8481 | CKMN | COOKS MOVING OF NORFOLK INC | | | SCAC4 |
| 8482 | CKMP | COMPTON, KEN JR TRUCKING INC | | | SCAC3 |
| 8483 | CKMQ | COOKS MOVING SERVICE INC | | | SCAC3 |
| 8484 | CKMQ | COOKS MOVING SERVICES INC | | | SCAC4 |
| 8485 | CKMR | CATSKILL MOUNTAIN RWY. | | | PWRC |
| 8486 | CKMR | CLARK MOVING & STORAGE INC | | | SCAC3 |
| 8487 | CKMS | COOK MOVING & STORAGE | | | SCAC3 |
| 8488 | CKMS | COOK MOVING & STORAGE | | | SCAC4 |
| 8489 | CKMT | CHECKMATE TRANSPORTATION SERVICES I | | | SCAC3 |
| 8490 | CKMV | CHECKER MOVING | | | SCAC3 |
| 8491 | CKNA | CLARK NORTH AMERICAN | | | SCAC3 |
| 8492 | CKNB | CARLOS TRUCKING | | | SCAC3 |
| 8493 | CKNC | CORKREN AND COMPANY INC | | | SCAC3 |
| 8494 | CKNC | CAIN TRUCKING INC | | | SCAC4 |
| 8495 | CKNG | COOPER, HAROLD C TRUCKING | | | SCAC3 |
| 8496 | CKNI | CTC TRUCKING INC | | | SCAC4 |
| 8497 | CKNL | CRESTBANK NAVIGATION LTD | | | SCAC3 |
| 8498 | CKNP | COBLESKILL STONE PRODUCTS INC | | | SCAC4 |
| 8499 | CKNQ | CONKLIN WAREHOUSE | | | SCAC3 |
| 8500 | CKNR | CLARKS TRANSPORT COMPANY LLC | | | SCAC4 |
