| 1 | CCO | Aerolineas Coco Club Hoteles de Mexico, S.A. de C.V. | Callsign: Aerococo, | MEX | AVCODES |
| 2 | CCO | Air Tenglong | IATA: VB, Callsign: Air Tenglong, | PRC | AVCODES |
| 3 | CCO | Clinchfield R.R. Co. | 1/1975-1/1980 | | NAKINA |
| 4 | CCO | Clinchfield R.R. Co. | 1/75-1/80 | | NRHS |
| 5 | CCO | CSX TRANSPORTATION, INC. [SEABOARD; CLINCHFIELD RR] | | | PWRC |
| 6 | CCO | Clinchfield Railroad Co. | | USA | TRAFFIC |
| 7 | CCOA | CANNON COACH LINES | | | SCAC3 |
| 8 | CCOB | CAROL COACHES INC | | | SCAC3 |
| 9 | CCOC | COASTAL CARRIERS OF CONNECTICUT | | | SCAC4 |
| 10 | CCOD | CLIPPER COURIER | | | SCAC3 |
| 11 | CCOD | CLIPPER COURIER LOGISTICS INC | | | SCAC4 |
| 12 | CCOF | COCO FORWARDERS INC | | | SCAC3 |
| 13 | CCOF | CROS CROFT TRANSPORT INC | | | SCAC4 |
| 14 | CCOG | CAMELOT COACH CORP | | | SCAC3 |
| 15 | CCOH | CONCHO COACHES INC | | | SCAC3 |
| 16 | CCOI | COAST COUNTRIES EXPRESS INC | | | SCAC3 |
| 17 | CCOI | CALCO INC | | | SCAC4 |
| 18 | CCOJ | CONTAINER COLLATING CO OF AMERICA | | | SCAC3 |
| 19 | CCOK | CALORE-COOK TRANS, INC | | | SCAC3 |
| 20 | CCOM | C-CON | | | SCAC3 |
| 21 | CCON | CHICOT TRANSPORT INC | | | SCAC3 |
| 22 | CCON | CHICOT TRANSPORT INC | | | SCAC4 |
| 23 | CCOO | CAPITOL CITY OIL CO | | | SCAC3 |
| 24 | CCOP | CENTRAL CO-OP NON-STOCK TRANSPORT C | | | SCAC3 |
| 25 | CCOP | COUNTRY STAR CO-OP INC | | | SCAC4 |
| 26 | CCOQ | CAPITOL CARTAGE CO | | | SCAC3 |
| 27 | CCOR | CENTRAL CARRIER CORP | | | SCAC3 |
| 28 | CCOS | CHOICE COURIER SYSTEMS INC | | | SCAC3 |
| 29 | CCOS | CHOICE LOGISTICS INC | | | SCAC4 |
| 30 | CCOS | CEMENTOS COSMOS, S.A. | | ES | VKM |
| 31 | CCOU | A-GAS AMERICAS (REFRIGERANTS & CARBON OFFSETS) | | USA | BIC |
| 32 | CCOU | Coolgas | | | RSRV |
| 33 | CCOU | CANTACLARO CONTAINER LINE | | | SCAC3 |
| 34 | CCOU | CONDOR PRODUCTS CO INC | | | SCAC4 |
| 35 | CCOV | CROSS COUNTRY OVERNIGHT INC | | | SCAC3 |
| 36 | CCOW | CROSS COUNTRY AUTO TRANSPORT INC | | | SCAC3 |
| 37 | CCOW | CELEBRATION CRUISE OPERATOR INC | | | SCAC4 |
| 38 | CCOX | Chickasha Cotton Oil Co. | 7/1935-10/1966; eliminated 10/1967 | | NAKINA |
| 39 | CCOX | Chickasha Cotton Oil Co. | 4/38-10/66; eliminated 10/67 | | NRHS |
| 40 | CCOX | *CHICKASHA COTTON OIL CO. | | | PWRC |
| 41 | CCOX | *COAL SUPPLY CORPORATION | | | PWRC |
| 42 | CCOX | CHICKASHA COTTON OIL CO | | | SCAC3 |
| 43 | CCOY | CROSS COUNTRY CORP | | | SCAC3 |
| 44 | CCOY | CAGEDLION CORPORATION | | | SCAC4 |
| 45 | CCOZ | CERTAINTEED COOP | | | PWRC |
