| 1 | CCC | European Aviation Services Ltd. | Callsign: Alderney, | GB | AVCODES |
| 2 | CCC | Colorado Corporate Charters, Inc. | Callsign: Venzara, | USA | AVCODES |
| 3 | CCC | Air Cargo Global s.r.o. | IATA: UB, Callsign: Global Cargo, IATA Prefix: 159, IATA Designator changed to CW. | SK | AVCODES |
| 4 | CCC | Air Cargo Global s.r.o. | IATA: CW, Callsign: Global Cargo, IATA Prefix: 159, IATA Designator changed to CW*. IATA Designator changed from UB. | SK | AVCODES |
| 5 | CCC | Air Cargo Global s.r.o. | IATA: CW, Callsign: Global Cargo, IATA Prefix: 159, Ceased opeations in December 2019. IATA Designator changed from CW. IATA Designator changed from UB. | SK | AVCODES |
| 6 | CCCB | CENTRAL COAST CABINETS | | | SCAC4 |
| 7 | CCCC | COLORADO CARTAGE COMPANY, INC. | | | PWRC |
| 8 | CCCC | CENTRAL CALIFORNIA CARTAGE COMPANY | | | SCAC4 |
| 9 | CCCE | CONDOR CARRIER INC | | | SCAC3 |
| 10 | CCCE | CLASSIC CAR CORNER LTD | | | SCAC4 |
| 11 | CCCG | CAPE COD CARTAGE INC | | | SCAC3 |
| 12 | CCCG | CCC TRUCKING | | | SCAC4 |
| 13 | CCCI | CONTINENTAL CAN COMPANY, INC. | | | PWRC |
| 14 | CCCI | CONTINENTAL CONTRACT CARRIER CORP | | | SCAC3 |
| 15 | CCCJ | CONTINENTAL COURIER CORP | | | SCAC3 |
| 16 | CCCJ | CONTINENTAL COURIER CORP | | | SCAC4 |
| 17 | CCCL | Connecticut Central R.R. Co. | added 1/1988; 1/1994; eliminated 10/1998; 7/2000-7/2005 | | NAKINA |
| 18 | CCCL | Connecticut Central R.R. Co. | added 1/88; 1/94; eliminated 10/98; 7/2000 | | NRHS |
| 19 | CCCL | CONNECTICUT CENTRAL RAILROAD | | | PWRC |
| 20 | CCCL | Connecticut Central Railroad | | | RSRV |
| 21 | CCCL | CONNECTICUT CENTRAL RAILROAD | | | SCAC3 |
| 22 | CCCL | CRYSTAL CAP CLEANERS INC | | | SCAC4 |
| 23 | CCCM | CROUSE CONTRACT CARRIER INC | | | SCAC3 |
| 24 | CCCM | COMMAND CONTROL CANINE LTD | | | SCAC4 |
| 25 | CCCN | CLIENTALE CARTAGE CORP | | | SCAC3 |
| 26 | CCCO | CAMIN CARGO CONTROL | | | SCAC4 |
| 27 | CCCP | COMMERCIAL CARRIER CORPORATION | | | SCAC3 |
| 28 | CCCP | COMMERCIAL CARRIER LOGISTICS LLC | | | SCAC4 |
| 29 | CCCQ | CAMPBELL CARTAGE CO INC | | | SCAC3 |
| 30 | CCCR | CROSS COUNTRY CARTAGE LTD | | | SCAC4 |
| 31 | CCCS | CAROLINA CONTRACT CARRIERS INC | | | SCAC3 |
| 32 | CCCStL | CLEVELAND CINCINNATI CHICAGO & ST. LOUIS RWY | | | PWRC |
| 33 | CCCSTL | Cleveland, Cincinnati, Chicago and St. Louis Ry. (Cincinnati Northern R.R.) | Real: NOR | USA | TRAFFIC |
| 34 | CCCT | Central California Traction Co. | 4/1938 | | NAKINA |
| 35 | CCCT | Central California Traction Co. | Apr-38 | | NRHS |
| 36 | CCCT | CENTRAL CALIFORNIA TRACTION CO. | | | PWRC |
| 37 | CCCU | CONRAIL CONTAINER GMBH | | D | BIC |
| 38 | CCCU | COMPASS CONTAINER CO INC | | | PWRC |
| 39 | CCCU | Compass Container | | | RSRV |
| 40 | CCCU | COMPASS CONTAINER INC. | | | SCAC3 |
| 41 | CCCU | CONRAIL CONTAINER SURVEY & SALES GM | | | SCAC4 |
| 42 | CCCV | CITY CAB COMPANY & LIMOUSINE SERVIC | | | SCAC3 |
| 43 | CCCV | CAROLINA CUSTOM CARRIER INC | | | SCAC4 |
| 44 | CCCW | CHAPMAN CARTAGE CO INC | | | SCAC3 |
| 45 | CCCX | CII Carbon L.L.C. | added 1/2004; 7/2005; eliminated 7/2006 | | NAKINA |
| 46 | CCCX | Carondelet Coke Corp. (captive service) | 1/1994 (not listed) | | NAKINA |
| 47 | CCCX | Coastal Chemical Corp. | added 7/1960; 4/1961-4/1970; eliminated 10/1972 | | NAKINA |
| 48 | CCCX | Continental Carbon Co. | 1/1943-10/1957; eliminated 7/1959 | | NAKINA |
| 49 | CCCX | Crystal Chemical Corp. | 7/1923 | | NAKINA |
| 50 | CCCX | Continental Carbon Co. | 1/52-10/57; eliminated 7/59 | | NRHS |
| 51 | CCCX | Coastal Chemical Corp. | added 7/60; 4/61-4/70; eliminated 10/72 | | NRHS |
| 52 | CCCX | Carondelet Coke Corp. (captive service) | Jan-94 | | NRHS |
| 53 | CCCX | *CRYSTAL CHEMICAL CORP. | | | PWRC |
| 54 | CCCX | *CONTINENTAL CARBON CO. | | | PWRC |
| 55 | CCCX | *COASTAL CHEMICAL CORP. | | | PWRC |
| 56 | CCCX | *CAPE COD CENTRAL | | | PWRC |
| 57 | CCCX | *CARONDELET COKE CORP. (CAPTIVE SERVICE) | | | PWRC |
| 58 | CCCX | +CII CARBON LLC | | | PWRC |
| 59 | CCCX | Carondelet Coke Corporation | | | RSRV |
| 60 | CCCX | COASTAL CHEMICAL CORP | | | SCAC3 |
| 61 | CCCX | CII CARBON LLC | | | SCAC4 |
| 62 | CCCY | CONTRACT CARTAGE COMPANY | | | SCAC3 |
| 63 | CCCZ | *CATENARY COAL COMPANY | | | PWRC |
| 64 | CCCZ | *COMPASS CONTAINER CO INC | | | PWRC |
| 65 | CCCZ | Compass Container | | | RSRV |
| 66 | CCCZ | COMPASS CONTAINER INC. | | | SCAC3 |
| 67 | CCCZ | COMPASS CONTAINER CO INC | | | SCAC4 |