| 801 | CAPZ | CAPES SHIPPING AGENCIES, INC | | | SCAC3 |
| 802 | CAQ | Cityair (Chester) Limited | Callsign: Air Chester, Ceased operations. | GB | AVCODES |
| 803 | CAQ | TOO Cerium Air | Callsign: Qazaq Eagle, | KZ | AVCODES |
| 804 | CAQ | Cityair (Chester) Limited | | | ICAO1 |
| 805 | CAQA | CAN-AM CONTAINERS | | | SCAC3 |
| 806 | CAQB | CAR CARRIER INC. | | | SCAC3 |
| 807 | CAQC | CANAL CARTAGE CO | | | SCAC3 |
| 808 | CAQC | CANAL CARTAGE CO | | | SCAC4 |
| 809 | CAQD | CANTANA TRANSPORT LTD | | | SCAC3 |
| 810 | CAQD | CANTANA TRANSPORT LTD | | | SCAC4 |
| 811 | CAQE | CATHCART AIRPORT EXPRESS LTD | | | SCAC3 |
| 812 | CAQE | COMPANIA AGROPECUARIA LA ESPERANZA | | | SCAC4 |
| 813 | CAQG | CUSTOM AIR CARGO | | | SCAC3 |
| 814 | CAQH | CLASSIC COACH INC | | | SCAC3 |
| 815 | CAQH | CENTURION AUTO LOGISITCS INC | | | SCAC4 |
| 816 | CAQK | CATCO TRUCKING | | | SCAC3 |
| 817 | CAQK | CONTINENTAL ASPHALT LOGISTICS INC | | | SCAC4 |
| 818 | CAQL | CARLEN TRANSPORT INC | | | SCAC3 |
| 819 | CAQL | CARLEN TRANSPORT INC | | | SCAC4 |
| 820 | CAQM | C & A MARINE TRANSPORTATION CO INC, | | | SCAC3 |
| 821 | CAQM | CANO & SONS TRUCKING LLC | | | SCAC4 |
| 822 | CAQN | CARON TRANSPORTATION | | | SCAC3 |
| 823 | CAQN | CANADA ONE AUTO SALES & LEASING | | | SCAC4 |
| 824 | CAQO | CALIFORNIA SHIPPERS ASSOCIATES | | | SCAC3 |
| 825 | CAQP | CENTRAL ARKANSAS PETROLEUM | | | SCAC3 |
| 826 | CAQP | CENTRAL ARKANSAS PETROLEUM TRANSPOR | | | SCAC4 |
| 827 | CAQQ | C & A TRANSPORT CORP | | | SCAC4 |
| 828 | CAQT | CMA TRUCKING | | | SCAC3 |
| 829 | CAQT | COURIER ASSOCIATES INC | | | SCAC4 |
| 830 | CAQW | CAR AMERICA SRL | | | SCAC3 |
| 831 | CAR | Inter RCA | Callsign: Quebec Romeo, | RCA | AVCODES |
| 832 | CAR | Inter RCA | | | ICAO1 |
| 833 | CAR | CARDINAL BUSES INC | | | SCAC4 |
| 834 | CAR | Cardiff Railway Company Ltd. | Real: CA, 1999: 138km standard gauge, not electrified | GB | TRAFFIC |
| 835 | CAR | CARBO Kohlensäurewerk Hannover GmbH | | DE | VKM |
| 836 | CARB | CAROLINE STREET TRUCKING | | | SCAC3 |
| 837 | CARB | CARBOFIN S P A | | | SCAC4 |
| 838 | CARBA | Carbagas | | CH | VKM |
| 839 | CARBO | „CARBO” Holding Sp. z o.o. | | PL | VKM |
| 840 | CARBON | Georges Carbon | | L | TRAFFIC |
| 841 | CARC | CARGOTRANS | | | SCAC4 |
| 842 | CARD | CARDINALE TRUCKING CORP | | | PWRC |
| 843 | CARD | CARDIFF MARINE INC | | | SCAC4 |
| 844 | CARD | Cardinal Coach Lines | | CDN | TRAFFIC |
| 845 | CARDP | Cardinale sas S.A.S. Noleggio Pullman Minibus Pescara | | I | TRAFFIC |
| 846 | CARE | CARRERA TRUCKING | | | SCAC3 |
| 847 | CAREF | Carefree Bus Tours, NJ | | USA | TRAFFIC |
| 848 | CAREY | Carey Airport Express | City: New York | US-NY | TRAFFIC |
| 849 | CARF | CAREFUL MOVING CO | | | SCAC3 |
| 850 | CARG | CARGO TRANSIT INC | | | SCAC4 |
| 851 | CARGO | Cargo Service GmbH | | AT | VKM |
| 852 | CARH | CAL RENTAL TOOL & SUPPLY INC | | | SCAC3 |
| 853 | CARI | CARR TRANSPORT INC | | | SCAC3 |
| 854 | CARI | CARE-FLO CARRIERS | | | SCAC4 |
| 855 | CARJ | CARAVAN MOVERS | | | SCAC3 |
| 856 | CARL | CARROLL BROS. EXPRESS, INC | | | SCAC3 |
| 857 | CARM | COSTA AMATORI S.P.A. | | | PWRC |
| 858 | CARM | CASTRO ANGULO. ROMELIA | | | SCAC4 |
| 859 | CARN | CARPENTER TRUCKING COMPANY INC | | | SCAC3 |
| 860 | CARO | CASSARO, ANGELO | | | SCAC3 |
| 861 | CARO | CARSONS TRANSPORT | | | SCAC4 |
| 862 | CARP | CARROLL CONTRETE CO INC | | | SCAC4 |
| 863 | CARQ | CARY TRANSFER CORPORATION, THE | | | SCAC3 |
| 864 | CARR | The Carrollton R.R. | 1/1975-1/1994; eliminated 4/1996; 7/2000-7/2005 | | NAKINA |
| 865 | CARR | The Carrollton R.R. | 1/75-1/94; eliminated 4/96; 7/2000 | | NRHS |
| 866 | CARR | CSX TRANSPORTATION (CARROLLTON RAILROAD) | | | PWRC |
| 867 | CARR | Carrollton Railroad | | | RSRV |
| 868 | CARR | CARROLLTON RAILROAD | | | SCAC3 |
| 869 | CARR | CARROLLTON RAILROAD | | | SCAC4 |
| 870 | CARS | CARTERS COACH INC | | | SCAC3 |
| 871 | CART | CARATAL COMPANY S A | | | SCAC3 |
| 872 | CARU | CARU CONTAINERS BV | | NL | BIC |
| 873 | CARU | RETIRED 06-30-93 ATP | | | PWRC |
| 874 | CARU | CAROLINA FREIGHT CARRIERS | | | SCAC3 |
| 875 | CARU | CONTAINER ASSOCIATION ROTTERDAM BV | | | SCAC4 |
| 876 | CARV | CARAVELLE MOVING & STORAGE INC | | | SCAC4 |
| 877 | CARW | Carolina Western | 1/1975 | | NAKINA |
| 878 | CARW | Carolina Western | Jan-75 | | NRHS |
| 879 | CARW | CAROLINA WESTERN RAILROAD | | | PWRC |
| 880 | CARX | Lamson & Sessions | added 1/1995; eliminated 1/1999; 7/2000 (not listed) | | NAKINA |
| 881 | CARX | Carlon | added 7/1984; 1/1994; eliminated 1/1995 | | NAKINA |
| 882 | CARX | Carlon, an Indian Head Co. | added 10/1977; 1/1980; eliminated 7/1984 | | NAKINA |
| 883 | CARX | Carlon Division, Indian Head, Inc. | added 10/1972; 1/1975; eliminated 10/1977 | | NAKINA |
| 884 | CARX | Cargo Carriers Inc. | added 7/1955; 10/1957-7/1965; eliminated 10/1965 | | NAKINA |
| 885 | CARX | Cargo Carriers Inc. | added 7/55; 10/57-7/65; eliminated 10/65 | | NRHS |
| 886 | CARX | Carlon Division, Indian Head, Inc. | added 10/72; 1/75 | | NRHS |
| 887 | CARX | Carlon, an Indian Head Co. | 1/80; eliminated 7/84 | | NRHS |
| 888 | CARX | Carlon | added 7/84; 1/94; eliminated 1/95 | | NRHS |
| 889 | CARX | Lamson & Sessions | added 1/95; eliminated 1/99; 7/2000 | | NRHS |
| 890 | CARX | *CANADIAN ATLANTIC RAILROAD (OUT OF EXISTENCE) | | | PWRC |
| 891 | CARX | *CARGO CARRIERS, INC. | | | PWRC |
| 892 | CARX | *LAMSON AND SESSIONS [CARLON INC.DIV. INDIAN HEAD CO.] | | | PWRC |
| 893 | CARX | +CALIBER AUTO TRANSFER | | | PWRC |
| 894 | CARX | Cargo Carriers (Lamson and Sessions) | | | RSRV |
| 895 | CARX | CALIBER AUTO TRANSFER | | | SCAC4 |
| 896 | CARY | CARUFEL REFRIGERATED SERVICES INC | | | SCAC3 |
| 897 | CARZ | *ANTON CARATON & SON | | | PWRC |
| 898 | CARZ | *CARGILL GRAIN | | | PWRC |
| 899 | CARZ | Anton Caraton and Son | | | RSRV |
| 900 | CAS | Christman Air System | Callsign: Christman, | USA | AVCODES |
