| 2501 | CCKX | CCKX, Inc. | added 4/1986; 1/1994; eliminated 7/1999; 7/2000-7/2005 (not listed) | | NAKINA |
| 2502 | CCKX | California Contemporary, Inc. | added 4/1962; 7/1965-1/1980; eliminated 4/1986 | | NAKINA |
| 2503 | CCKX | Carthage Creamery Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 2504 | CCKX | Carthage Creamery Co. | 7/1932 | | NAKINA |
| 2505 | CCKX | California Contemporary, Inc. | added 4/62; 7/65-1/80; eliminated 4/86 | | NRHS |
| 2506 | CCKX | CCKX, Inc. | added 4/86; 1/94; eliminated 7/99; 7/2000 | | NRHS |
| 2507 | CCKX | *CARTHAGE CREAMERY CO. | | | PWRC |
| 2508 | CCKX | +CCKX INC. (CALIFORNIA CONTEMPORARY, INC.) | | | PWRC |
| 2509 | CCKX | California Contemporary (CCKX) | | | RSRV |
| 2510 | CCKX | CALIFORNIA CONTEMPORARY INC | | | SCAC3 |
| 2511 | CCKX | CCKX INCORPORATED | | | SCAC4 |
| 2512 | CCKY | Chattooga & Chickamauga Ry. Co. | added 1/1990; 1/1994-7/2000; eliminated 1/2004; 7/2005 | | NAKINA |
| 2513 | CCKY | Chattooga & Chickamauga Ry. Co. | added 1/90; 1/94-7/2000 | | NRHS |
| 2514 | CCKY | CHATTOOGA & CHICKAMAUGA RAILWAY COMPANY | | | PWRC |
| 2515 | CCKY | Chattooga and Chickamauga Railway | | | RSRV |
| 2516 | CCKY | CHATTOOGA & CHICKAMAUGA RAILWAY CO | | | SCAC3 |
| 2517 | CCKY | Chattooga & Chickamauga | | USA | TRAFFIC |
| 2518 | CCL | Continental Aviation Limited (Contical) | Callsign: Contical, | GH | AVCODES |
| 2519 | CCL | CC-Logistik GmbH | | D | TRAFFIC |
| 2520 | CCL | Connex Cargo Logistics | | DE | VKM |
| 2521 | CCLA | COCA-COLA BOTTLING MIDWEST INC | | | SCAC3 |
| 2522 | CCLB | COCA-COLA BOTTLING YAKIMA-TRI CITIE | | | SCAC3 |
| 2523 | CCLB | CLC CARRIERS LLC | | | SCAC4 |
| 2524 | CCLC | CHARLES CHAUFFEURED LIMOUSINE RENTA | | | SCAC3 |
| 2525 | CCLD | CALCIUM CLORIDE SALES INC | | | SCAC3 |
| 2526 | CCLD | CALCIUM CLORIDE SALES INC | | | SCAC4 |
| 2527 | CCLE | CIRCLE T TRUCKING | | | SCAC3 |
| 2528 | CCLG | CARRIER CLEARING SERVICE | | | SCAC3 |
| 2529 | CCLG | CIRCLE G LLC | | | SCAC4 |
| 2530 | CCLG | CC-Logistik GmbH & Co. KG | | DE | VKM |
| 2531 | CCLH | CLASSIC LEATHER INC | | | SCAC4 |
| 2532 | CCLI | COACH CHARTER & LEASING INC | | | SCAC3 |
| 2533 | CCLI | CCL | | | SCAC4 |
| 2534 | CCLJ | CONNECTICUT CELEBRITY LIMOUSINE SER | | | SCAC3 |
| 2535 | CCLK | COATS AND CLARK SALES CORPORATION | | | SCAC3 |
| 2536 | CCLL | COMMODORE CRUISE LINES | | | PWRC |
| 2537 | CCLL | CANCILLA, FRANK F III | | | SCAC3 |
| 2538 | CCLL | CARGO CONTAINER LINE LIMITED | | | SCAC4 |
| 2539 | CCLM | C C LUMBER CO INC | | | SCAC3 |
| 2540 | CCLN | CANTRAIL COACH LINES LTD | | | SCAC3 |
| 2541 | CCLN | COSCO CONTAINER LINES AMERICAS INC | | | SCAC4 |
| 2542 | CCLO | CAL COAST LOGISTICS INC | | | SCAC4 |
| 2543 | CCLQ | COLONIAL CONSOLIDATED EXPRESS INC | | | SCAC3 |
| 2544 | CCLR | CLARK, CAM FORD SALES LTD | | | SCAC4 |
| 2545 | CCLS | CONSOLIDATED COPPERSTATE LINES | | | PWRC |
| 2546 | CCLS | CLASSIC COACH LIMOUSINES INC | | | SCAC3 |
| 2547 | CCLS | COMMERCIAL SERVICES | | | SCAC4 |
| 2548 | CCLT | CIRCLE T TRAVEL | | | SCAC3 |
| 2549 | CCLT | CASA CHINA LIMITED | | | SCAC4 |
| 2550 | CCLU | COSCO SHIPPING DEVELOPMENT (ASIA) CO.,LTD | | HK | BIC |
| 2551 | CCLU | CHAR CHING SHIPPING (USA) LTD. | | | PWRC |
| 2552 | CCLU | Char Ching Shipping | | | RSRV |
| 2553 | CCLU | CHINA SHIPPING CONTAINER LINES CO | | | SCAC4 |
| 2554 | CCLW | CLEMENS, CLYLE W | | | SCAC3 |
| 2555 | CCLW | CRESTLINE COACH LTD | | | SCAC4 |
| 2556 | CCLX | Crystal Car Line, Inc. | 10/1957-7/2000; eliminated 1/2003; added 10/2003; 7/2005 | | NAKINA |
| 2557 | CCLX | Crystal Car Line | 8/1920-7/1954 | | NAKINA |
| 2558 | CCLX | Crystal Car Line, Inc. | 4/38-7/2000 | | NRHS |
| 2559 | CCLX | CRYSTAL CAR LINE | | | PWRC |
| 2560 | CCLX | Crystal Car Lines | | | RSRV |
| 2561 | CCLX | CRYSTAL CAR LINE | | | SCAC3 |
| 2562 | CCLX | CRYSTAL CAR LINE | | | SCAC4 |
| 2563 | CCLX | Crystal Car Line, Inc. | | USA | TRAFFIC |
| 2564 | CCLY | CLASSIC CARRIAGES LTD | | | SCAC3 |
| 2565 | CCLY | CASCADE CARRIERS LP | | | SCAC4 |
| 2566 | CCLZ | COCA COLA | | | PWRC |
| 2567 | CCLZ | CHAR CHING MARINE CO. LTD | | | SCAC3 |
| 2568 | CCM | Compagnie Aerienne Corse Mediterranee | IATA: XK, Callsign: Corsica, IATA Prefix: 146, Name changed to CCM Airlines w.e.f. November 2000. IATA designator changed from ZN | F | AVCODES |
| 2569 | CCM | Compagnie Aerienne Corse Mediterranee | IATA: ZN, Callsign: Corsemedi, Established on 01 January 1989. Commenced operations in June 1990. IATA designator changed to XK | F | AVCODES |
| 2570 | CCM | Compagnie Aerienne Corse Mediterranee | IATA: XK, Callsign: Corsica, IATA Prefix: 146, Name changed to Air Corsica w.e.f. October 2010. Name changed from Compagnie Aerienne Corse Mediterranee. IATA designator changed from ZN | F | AVCODES |
| 2571 | CCM | Air Corsica | IATA: XK, Callsign: Corsica, IATA Prefix: 146, Name changed from Compagnie Aerienne Corse Mediterranee w.e.f. October 2010. Name changed from Compagnie Aerienne Corse Mediterranee. IATA designator changed from ZN | F | AVCODES |
| 2572 | CCM | Corse-Mediterranee | IATA: XK | | ICAO1 |
| 2573 | CCMA | CONNORS, C M | | | SCAC3 |
| 2574 | CCMA | CONNORS, C M | | | SCAC4 |
| 2575 | CCMB | CELTIC MARINE CORPORATION | | | SCAC4 |
| 2576 | CCMBL | Culver City Municipal Bus Lines | | US-CA | TRAFFIC |
| 2577 | CCMC | C.C. MID WEST, INC | | | SCAC3 |
| 2578 | CCME | CHERRY CITY METALS LLC | | | SCAC4 |
| 2579 | CCMF | COLUMBUS & CHICAGO MTR FRT | | | PWRC |
| 2580 | CCMF | CHICAGO & COASTAL MOTOR EXPRESS INC | | | SCAC3 |
| 2581 | CCMG | COASTAL CHARTER SERVICE | | | SCAC3 |
| 2582 | CCMH | CHECKMA | | | SCAC4 |
| 2583 | CCMI | CITY CARTAGE AND MOVING INC | | | SCAC3 |
| 2584 | CCMI | COMMERCIA | | | SCAC4 |
| 2585 | CCMI | The State Railway of the Democratic People's Republic of Korea | | PRK | TRAFFIC |
| 2586 | CCMJ | COSCO NORTH AMERICA INC. | | | SCAC3 |
| 2587 | CCMK | C & C MARKETING | | | SCAC3 |
| 2588 | CCMK | CELTIC MARINE CORPORATION (TRUCK/RA | | | SCAC4 |
| 2589 | CCML | CASCADIA MANUFACTURING LTD | | | SCAC4 |
| 2590 | CCMM | CHARLESTOWN COMMUNITY INC | | | SCAC3 |
| 2591 | CCMM | CORECOMPOS | | | SCAC4 |
| 2592 | CCMN | C C M ENTERPRISES INC | | | SCAC3 |
| 2593 | CCMO | CLASSIC CITY MOVING AND STORAGE INC | | | SCAC3 |
| 2594 | CCMO | CLASSIC CITY MOVING AND STORAGE INC | | | SCAC4 |
| 2595 | CCMP | CANADIAN CAMPING TOURS LTD | | | SCAC3 |
| 2596 | CCMP | CONTROL CHEMICAL (1989) CORP | | | SCAC4 |
| 2597 | CCMQ | CENTRAL CUMBERLAND COMPANY | | | SCAC3 |
| 2598 | CCMQ | CCM MARKETING, MANUFACTURING & DIST | | | SCAC4 |
| 2599 | CCMS | CLEMONS COURIER SERVICES INC | | | SCAC3 |
| 2600 | CCMS | CLEMONS COURIER SERVICES INC | | | SCAC4 |
