| 12801 | COY | Coyne Aviation | IATA: 7C | | ICAO1 |
| 12802 | COYB | COY BROS | | | SCAC3 |
| 12803 | COYC | COY CARTAGE & STORAGE | | | SCAC3 |
| 12804 | COYE | COYLE ENTERPRISES INC | | | SCAC3 |
| 12805 | COYF | COYOTE FUELS LLC | | | SCAC4 |
| 12806 | COYG | COYS TRUCKING | | | SCAC4 |
| 12807 | COYJ | CONDOR | | | SCAC4 |
| 12808 | COYL | COYLE TRUCKING INC | | | SCAC4 |
| 12809 | COYM | COYMAN BROTHERS, INC | | | SCAC3 |
| 12810 | COYM | CO-COUNTY PETROLEUM | | | SCAC4 |
| 12811 | COYO | COMMERCIAL WAREHOUSES | | | SCAC3 |
| 12812 | COYQ | COLLETTE, A N OIL CO INC | | | SCAC4 |
| 12813 | COYR | COYOTE EXPRESS INCORPORATED | | | SCAC3 |
| 12814 | COYS | COYS AUTO REBUILDERS | | | SCAC3 |
| 12815 | COYT | COYNE MOTOR SERVICE INC | | | SCAC3 |
| 12816 | COYT | COYOTE CARGO INC | | | SCAC4 |
| 12817 | COYU | CONTAINENTAL LTD | | GB | BIC |
| 12818 | COYU | CONTAINENTAL LTD | | | SCAC3 |
| 12819 | COYY | COYOTE LOGISTICS LLC (INTERMODAL DI | | | SCAC4 |
| 12820 | COZ | Cosmic Air PVT. Ltd. | IATA: F5, Callsign: Cosmic Air, Designator F5* recalled by IATA | NEP | AVCODES |
| 12821 | COZ | Corair, Sàrl | Callsign: Cora, | F | AVCODES |
| 12822 | COZ | Cosmic Air | IATA: F5 | | ICAO1 |
| 12823 | COZ | CSX TRANSPORTATION, INC. | | | PWRC |
| 12824 | COZ | CSX Transportation | | | RSRV |
| 12825 | COZ | CSX TRANSPORTATION | | | SCAC4 |
| 12826 | COZC | COMMERCIAL ZONE CARTAGE INC | | | SCAC3 |
| 12827 | COZD | CONFEDERATE | | | SCAC4 |
| 12828 | COZM | CONZEMUIS CARRIERS | | | SCAC3 |
| 12829 | COZN | COATES NORMAN TRUCKING | | | SCAC3 |
| 12830 | COZO | CONZEMIUS OIL COMPANY | | | SCAC3 |
| 12831 | COZS | CORNERSTONE | | | SCAC4 |
| 12832 | COZT | C O T (COMPANIA ORIENTAL DE TURISMO | | | SCAC3 |
| 12833 | COZU | MAERSK A/S | | DK | BIC |
| 12834 | CP | CP Air | ICAO: CPC, Callsign: Empress, Bought by Pacific Western and merged to form Canadian Airlines International | CDN | AVCODES |
| 12835 | CP | Capitol Airways | ICAO: CAL, Callsign: Capitol, Ceased operations | GB | AVCODES |
| 12836 | CP | Canadian Airlines International Limited | ICAO: CDN, Callsign: Canadian, Merged into Air Canada. Formerly CP Air | CDN | AVCODES |
| 12837 | CP | Canadian Pacific Airlines Ltd. | ICAO: CPC, Callsign: Empress, Name changed to Canadian Airlines International Ltd. Name changed from CP Air | CDN | AVCODES |
| 12838 | CP | Compass Airlines LLC | ICAO: CPZ, Callsign: Compass Rose, IATA Prefix: 003, ICAO Callsign changed to Compass. | USA | AVCODES |
| 12839 | CP | Compass Airlines LLC | ICAO: CPZ, Callsign: Compass, IATA Prefix: 003, Ceased operation on 05 April 2020. ICAO Callsign changed from Compass Rose. Wholly-owned subsidiary of Trans States Holdings, Inc. | USA | AVCODES |
| 12840 | CP | Aliscargo Airlines S.p.A. | ICAO: LSI, Callsign: Alis, IATA Prefix: 233, | I | AVCODES |
| 12841 | CP | Canadian Pacific Ry. Co. | added 1/1997; 7/2000-7/2005 | | NAKINA |
| 12842 | CP | CP Rail System | eliminated 1/1997 | | NAKINA |
| 12843 | CP | Canadian Pacific Ry. | 8/1920-10/1966 | | NAKINA |
| 12844 | CP | CP Rail | 1/1975-1/1994 | | NAKINA |
| 12845 | CP | Canadian Pacific Ry. | 7/23-10/66 | | NRHS |
| 12846 | CP | CP Rail | 1/75-1/94 | | NRHS |
| 12847 | CP | CP Rail System | eliminated 1/97 | | NRHS |
| 12848 | CP | Canadian Pacific Ry. Co. | added 1/97; 7/2000 | | NRHS |
| 12849 | CP | CP RAIL [CANADIAN PACIFIC RWY.] | | | PWRC |
| 12850 | CP | Canadian Pacific Railway | | | RSRV |
| 12851 | CP | CP RAIL SYSTEM | | | SCAC4 |
| 12852 | CP | Comboios de Portugal | | P | TRAFFIC |
| 12853 | CP | Caminhos de Ferro Portugeses, E.P. | | PT | VKM |
| 12854 | CPA | Cathay Pacific Airways Ltd. | IATA: CX, Callsign: Cathay, IATA Prefix: 160, ICAO designator changed from CPX | HK | AVCODES |
| 12855 | CPA | Capital Air Service, Inc. | Callsign: Capair, | USA | AVCODES |
| 12856 | CPA | Cathay Pacific | IATA: CX | | ICAO1 |
| 12857 | CPA | Coudersport & Port Allegany | 1/1975-1/1980 | | NAKINA |
| 12858 | CPA | Cumberland & Pennsylvania R.R. | 4/1938-7/1954 | | NAKINA |
| 12859 | CPA | Cumberland & Pennsylvania R.R. | 4/38-1/52 | | NRHS |
| 12860 | CPA | Coudersport & Port Allegany | 1/75-1/80 | | NRHS |
| 12861 | CPA | *CSX TRANSPORTATION [WESTERN MARYLAND; CUMBERLAND & PENNSYLVANIA RR] | | | PWRC |
| 12862 | CPA | *COUDERSPORT & PORT ALLEGHENY RAILROAD | | | PWRC |
| 12863 | CPA | Cathay Pacific | | HK | TRAFFIC |
| 12864 | CPAA | Canadian Pacific Ry. Co. | added 1/1997; 7/2000-7/2005 | | NAKINA |
| 12865 | CPAA | CP Rail System | eliminated 1/1997 | | NAKINA |
| 12866 | CPAA | CP Rail | 1/1975-1/1994 | | NAKINA |
| 12867 | CPAA | CP Rail | 1/75-1/94 | | NRHS |
| 12868 | CPAA | CP Rail System | eliminated 1/97 | | NRHS |
| 12869 | CPAA | Canadian Pacific Ry. Co. | added 1/97; 7/2000 | | NRHS |
| 12870 | CPAA | CP RAIL [CANADIAN PACIFIC RWY.] | | | PWRC |
| 12871 | CPAA | Canadian Pacific Railway | | | RSRV |
| 12872 | CPAC | COMPAC TRANSPORTATION | | | SCAC3 |
| 12873 | CPAC | CAMPBELL, A C TRANSPORT INC | | | SCAC4 |
| 12874 | CPAD | CAPE ANN TRANSPORT INC | | | SCAC3 |
| 12875 | CPAD | C P CARRIER INC | | | SCAC4 |
| 12876 | CPAE | CORNPATCH EXPRESS INC | | | SCAC3 |
| 12877 | CPAF | CPS INDUSTRIES | | | SCAC4 |
| 12878 | CPAG | CHAMPAIGN TRUCKS INC | | | SCAC3 |
| 12879 | CPAH | CORPORATE AIR EXPRESS | | | SCAC3 |
| 12880 | CPAI | COTPAC | | | SCAC3 |
| 12881 | CPAK | C-BAR-J CORP | | | SCAC4 |
| 12882 | CPAM | COMPASS MARINE SERVICE | | | SCAC3 |
| 12883 | CPAO | CONTINENTAL TRANSPORTATION & DISTRI | | | SCAC4 |
| 12884 | CPAP | COMPAC TRANSPORTATION | | | SCAC3 |
| 12885 | CPAP | COMPAC TRANSPORTATION | | | SCAC4 |
| 12886 | CPAQ | CAPONE, ALBERT TRUCKING INC | | | SCAC3 |
| 12887 | CPAR | CHAMPALAS TRUCKING | | | SCAC4 |
| 12888 | CPAS | COPP & ASSOCIATES INC | | | SCAC4 |
| 12889 | CPAT | COMPLETE AUTO TRANSIT INCC | | | SCAC3 |
| 12890 | CPAT | CONSULTANT P A T | | | SCAC4 |
| 12891 | CPAU | COMBIPASS SAS | | F | BIC |
| 12892 | CPAU | COMBIPASS SAS | | | SCAC4 |
| 12893 | CPAV | COUPE & COMPANY | | | SCAC4 |
| 12894 | CPAX | CITGO Petroleum Corp. | added 7/1993; 1/1994-7/2005; eliminated 4/2008 | | NAKINA |
| 12895 | CPAX | Compania Mexicana de Petroleo ""El Aguila"", S.A. | 7/1937-4/1938 | | NAKINA |
| 12896 | CPAX | Compania Mexicana de Petroleo "El Agila", S.A. | Apr-38 | | NRHS |
| 12897 | CPAX | CITGO Petroleum Corp. | added 7/93; 1/94-7/2000 | | NRHS |
| 12898 | CPAX | *COMPANIA MEXICANA DE PETROLEO "EL AGUILA", S. A. | | | PWRC |
| 12899 | CPAX | *CITGO PETROLEUM CORPORATION | | | PWRC |
| 12900 | CPAX | +NUSTAR MARKETING, LLC | | | PWRC |
