| 8601 | CKSG | COOKS TRANSFER & STORAGE CO INC | | | SCAC3 |
| 8602 | CKSH | CHEROKEE SHIPPING CORP OF MONROVIA | | | SCAC3 |
| 8603 | CKSI | Carthage, Knightstown & Shirley R.R. Inc. | added 1/1989; eliminated 10/1989; 1/1994-7/2005 | | NAKINA |
| 8604 | CKSI | Carthage, Knightstown & Shirley R.R. Inc. | added 1/89; eliminated 10/89; 1/94-7/2000 | | NRHS |
| 8605 | CKSI | CARTHAGE, KNIGHTSTOWN & SHIRLEY RAILROAD | | | PWRC |
| 8606 | CKSI | Carthage Knightstown and Shirley Railroad | | | RSRV |
| 8607 | CKSI | CARTHAGE KNIGHTSTOWN & SHIRLEY RAIL | | | SCAC3 |
| 8608 | CKSI | CARTHAGE KNIGHTSTOWN & SHIRLEY RAIL | | | SCAC4 |
| 8609 | CKSJ | CLARK, STANLEY J INC | | | SCAC3 |
| 8610 | CKSK | CLARKS TRUCKING | | | SCAC3 |
| 8611 | CKSL | CHEEK SKYLINE LOGGING INC | | | SCAC3 |
| 8612 | CKSM | CRANKSHAFT MACHINE CO | | | SCAC3 |
| 8613 | CKSM | CLARKSVILLE SOD FARMS INC | | | SCAC4 |
| 8614 | CKSN | COOKS TANK LINE INC | | | SCAC3 |
| 8615 | CKSO | Condon, Kinzua & Southern R.R. Co. | 1/1975; eliminated 10/1977 | | NAKINA |
| 8616 | CKSO | Condon, Kinzua & Southern R.R. Co. | Jan-75 | | NRHS |
| 8617 | CKSO | CONDON, KINZUA & SOUTHERN RAILROAD CO. | | | PWRC |
| 8618 | CKSO | CORDON KINZUA & SOUTHERN | | | SCAC3 |
| 8619 | CKSP | COOK TRANSPORTATION | | | SCAC3 |
| 8620 | CKSQ | COOKS TERMINAL WAREHOUSE | | | SCAC3 |
| 8621 | CKSQ | CUSTOMS BROKERS SUPPLY INC | | | SCAC4 |
| 8622 | CKSR | COOKS TRANSPORTATION | | | SCAC3 |
| 8623 | CKSS | CLARK, R D & SONS | | | SCAC4 |
| 8624 | CKST | CASKET DISTRIBUTORS INC | | | SCAC3 |
| 8625 | CKSU | CK LINE CO LTD | | ROK | BIC |
| 8626 | CKSU | STB H20 | | | SCAC4 |
| 8627 | CKSW | CHICKASAW CONTAINER SRVICES INC | | | SCAC3 |
| 8628 | CKSX | Clare K. Sullivan | 1/1943 (not listed) | | NAKINA |
| 8629 | CKSX | CLARE K. SULLIVAN | | | PWRC |
| 8630 | CKSY | COOKSEY OIL CO INC | | | SCAC4 |
| 8631 | CKT | Caledonian Airways Limited | IATA: KG, Callsign: Caledonian, Merged into JMC 27 March 2002. | GB | AVCODES |
| 8632 | CKT | Caledonian Airways Limited | IATA: KT, Callsign: Caledonian, IATA dsignator changed to KG | GB | AVCODES |
| 8633 | CKTA | CORE TRUCKING COMPANY OF TEXAS INC | | | SCAC4 |
| 8634 | CKTB | C K TRUCKING CORP | | | SCAC3 |
| 8635 | CKTB | C K TRANSPORTATION SERVICES INC | | | SCAC4 |
| 8636 | CKTC | COOK, R TRUCKING | | | SCAC3 |
| 8637 | CKTD | CLARK TRUCKING SERVICES INC | | | SCAC3 |
| 8638 | CKTD | C K TRANSPORTATION LTD | | | SCAC4 |
| 8639 | CKTE | CLARK TRANSPORTATION CANADA LTD | | | SCAC3 |
| 8640 | CKTF | CLARK TRUCKING, INC. | | | SCAC3 |
| 8641 | CKTF | CLARK TRUCKING INC | | | SCAC4 |
| 8642 | CKTG | CRONK TRANSPORT INC | | | SCAC3 |
| 8643 | CKTG | CLOCK TRANSPORT LLC | | | SCAC4 |
| 8644 | CKTH | CHOPTANK TRANSPORT INC | | | SCAC4 |
| 8645 | CKTJ | CLARKE TRANSPORTATION CANADA LIMITE | | | SCAC3 |
| 8646 | CKTK | CHICKS TRUCKING INC | | | SCAC3 |
| 8647 | CKTL | COOK TANK LINES | | | SCAC4 |
| 8648 | CKTN | COOK TRANSPORT INC | | | SCAC3 |
| 8649 | CKTN | CIRCLE K TRUCKING INC | | | SCAC4 |
| 8650 | CKTO | COOK TRANSPORT | | | SCAC3 |
| 8651 | CKTO | CENTRAL KENTUCKY TRANSPORT INC | | | SCAC4 |
| 8652 | CKTP | CLARKE TRANSPORT ROUTIER LTEE | | | SCAC3 |
| 8653 | CKTP | CLARKE TRANSPORT INC | | | SCAC4 |
| 8654 | CKTQ | CHUCKS TRAILER SPOTTING SERVICE | | | SCAC3 |
| 8655 | CKTQ | COOKE TRUCKING INC | | | SCAC4 |
| 8656 | CKTR | COOKE TRUCKING, WILLIAM | | | SCAC3 |
| 8657 | CKTT | CROCKETT, DONALD E | | | SCAC3 |
| 8658 | CKTU | COOL WORLD NEDERLAND BV | | NL | BIC |
| 8659 | CKTU | CKT PARTS & TOOLS B.V. | | | SCAC3 |
| 8660 | CKTU | COOL WORLD WAALWIJK | | | SCAC4 |
| 8661 | CKTV | COOKSON TRUCKING CO INC | | | SCAC4 |
| 8662 | CKTW | C K TRUCKING (DIV OF MENASHA TRANSP | | | SCAC3 |
| 8663 | CKTW | CK TRANSPORT INC | | | SCAC4 |
| 8664 | CKTY | CLARK TRAVEL INC | | | SCAC3 |
| 8665 | CKTZ | Centar za Kombinirani Transport Zagreb d.d. | | HR | VKM |
| 8666 | CKUC | CRK TRUCKING INC | | | SCAC4 |
| 8667 | CKUN | CONTRAK COURIER INC | | | SCAC3 |
| 8668 | CKUO | CORDOVA TRUCK CO INC | | | SCAC4 |
| 8669 | CKUV | C & K TRUCKING SERVICE INC | | | SCAC4 |
| 8670 | CKVI | CKV TRANSPORT INC | | | SCAC3 |
| 8671 | CKVK | CLARK, V L TRUCKING | | | SCAC3 |
| 8672 | CKVL | COOKEVILLE MOTOR LINE | | | SCAC3 |
| 8673 | CKVP | CHKALOVSK SHIPPING COMPANY LIMITED | | | SCAC3 |
| 8674 | CKVQ | CROOKSVILLE TRANSFER | | | SCAC3 |
| 8675 | CKVS | CLARK VAN SERVICE INC | | | SCAC3 |
| 8676 | CKWK | CAKEWORKS | | | SCAC4 |
| 8677 | CKWL | CORMIER, KEVIN W LTD | | | SCAC4 |
| 8678 | CKWM | CHEEK, W M TRUCKING INC | | | SCAC3 |
| 8679 | CKWR | CLARKS WRECKER SERVICE | | | SCAC3 |
| 8680 | CKWS | C & K WRECKER SERVICE INCORPORATED | | | SCAC3 |
| 8681 | CKWV | CHICKS TOWING SERVICE INC | | | SCAC4 |
| 8682 | CKX | Coopers Creek Chemical Co. | 7/1923; 7/1935-7/1937 | | NAKINA |
| 8683 | CKX | COOPERS CREEK CHEMICAL CO. | | | PWRC |
| 8684 | CKXC | COAST LINK TRANSPORTATION LLC | | | SCAC4 |
| 8685 | CKXE | CLICK EXPRESS (DIV OF 4186401 | | | SCAC4 |
| 8686 | CKXG | CTL | | | SCAC4 |
| 8687 | CKXI | CHECKMATE TRANSPORT INC | | | SCAC4 |
| 8688 | CKXN | CKC TRANSPORTATION | | | SCAC4 |
| 8689 | CKXO | COOK TRANSPORT | | | SCAC4 |
| 8690 | CKXP | C & K EXPRESS INC | | | SCAC3 |
| 8691 | CKXT | CLARK TRANSPORT LLC | | | SCAC4 |
| 8692 | CKXU | CAKEBOXX TECHNOLOGIES,LLC | | USA | BIC |
| 8693 | CKXU | Cakeboxx Technologies | | | RSRV |
| 8694 | CKXV | CLARK TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 8695 | CKY | Sky Airlines Ltd. | Callsign: Sky Libra, ICAO callsign changed from Sky Cyprus | CY | AVCODES |
| 8696 | CKY | Sky Airlines Ltd. | Callsign: Sky Cyprus, ICAO callsign changed to Sky Libra | CY | AVCODES |
| 8697 | CKYQ | CORKYS TRANSFER | | | SCAC3 |
| 8698 | CKZ | CIRCLE K | | | PWRC |
| 8699 | CL | Lufthansa CityLine | ICAO: CLH, Callsign: Hansaline, IATA Prefix: 683, Name changed from Lufthansa Cityline GmbH | D | AVCODES |
| 8700 | CL | Lufthansa CityLine GmbH | ICAO: CLH, Callsign: Hansaline, IATA Prefix: 683, Name changed to Lufthansa Cityline | D | AVCODES |
