| 1 | CA | Air China International Corporation | ICAO: CCA, Callsign: Air China, IATA Prefix: 999, Name changed to Air China Limited. Name changed from CAAC - Civil Aviation Administration of China | PRC | AVCODES |
| 2 | CA | Caledonian Airways Ltd. | Callsign: Caledonian, Name changed to Caledonian - British United Airways (Charter) Ltd. | GB | AVCODES |
| 3 | CA | British Caledonian Airways (Charter) Ltd. | Callsign: Caledonian, Name changed from Caledonian - British United Airways (Charter) Ltd. Name changed from Name changed from Caledonian Airways Ltd. | GB | AVCODES |
| 4 | CA | Air China Cargo Co., Ltd. | ICAO: CAO, Callsign: Airchina Freight, IATA Prefix: 999, | PRC | AVCODES |
| 5 | CA | Air China Limited | ICAO: CCA, Callsign: Air China, IATA Prefix: 999, Name changed from Air China International Corporation. Name changed from CAAC - Civil Aviation Administration of China | PRC | AVCODES |
| 6 | CA | Chesapeake & Albemarie R.R. Co., Inc. | added 7/1990; 1/1994; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
| 7 | CA | Chesapeake & Albemarie R.R. Co., Inc. | added 7/90; 1/94; eliminated 7/96; 7/2000 | | NRHS |
| 8 | CA | CHESAPEAKE & ALBEMARLE RAILROAD CO. | | | PWRC |
| 9 | CA | Chesapeake and Albemarle Railroad | | | RSRV |
| 10 | CA | CHESAPEAKE & ALBEMARLE | | | SCAC4 |
| 11 | CA&D | CHICAGO AURORA & DeKALB RR | | | PWRC |
| 12 | CA&S | CHICAGO ATTICA & SOUTHERN RR | | | PWRC |
| 13 | CAA | Atlantic Southeast Airlines, Inc. | IATA: EV, Callsign: Candler, IATA Prefix: 862, ICAO designator changed to ACY. ICAO callsign change to Acey. ICAO designator changed from ASE | USA | AVCODES |
| 14 | CAA | Carnival Air Lines | IATA: KW, Merged into Pan American World Airways, Inc. | USA | AVCODES |
| 15 | CAA | Central American Airways | Callsign: Cenam, | USA | AVCODES |
| 16 | CAA | Civil Aviation Authority of the Czech Republic | Callsign: Inspector, | CZ | AVCODES |
| 17 | CAA | Atlantic Southeast Airlines | | | ICAO1 |
| 18 | CAAB | CATALANO BROS INC | | | SCAC3 |
| 19 | CAAB | CATALANO BROS INC | | | SCAC4 |
| 20 | CAAC | CLASSIC TRANSPORTATION INC | | | SCAC3 |
| 21 | CAAD | CANADIAN PROPELLER LTD | | | SCAC4 |
| 22 | CAAE | CAMPBELL'S AUTO EXPRESS | | | SCAC3 |
| 23 | CAAE | CAMPBELLS AUTO EXPRESS | | | SCAC4 |
| 24 | CAAH | CALIFORNIA AND HAWAIIAN SUGAR COMPA | | | SCAC3 |
| 25 | CAAH | COULSON AIRCRANE LTD | | | SCAC4 |
| 26 | CAAI | CALDERON AIR TRANSPORT INC | | | SCAC3 |
| 27 | CAAJ | CALARCO INC | | | SCAC3 |
| 28 | CAAK | CAAMANO TRUCKING | | | SCAC3 |
| 29 | CAAK | CALEDON BOATWORKS | | | SCAC4 |
| 30 | CAAL | CANADIAN | | | SCAC4 |
| 31 | CAAM | C & A MOTOR EXPRESS CO | | | SCAC3 |
| 32 | CAAM | CAN/AM | | | SCAC4 |
| 33 | CAAN | CAL-ATLANTIC NORTH AMERICA | | | SCAC3 |
| 34 | CAAN | C PAK & CO | | | SCAC4 |
| 35 | CAAO | CALMOS COMBINING CO | | | SCAC3 |
| 36 | CAAO | CAMELI, J C TRUCKING | | | SCAC4 |
| 37 | CAAP | CALIFORNIA APPLIANCE INSTALLERS, IN | | | SCAC3 |
| 38 | CAAP | C & A PROJECTS LTD | | | SCAC4 |
| 39 | CAAQ | CALIFORNIA ALFALFA CUBE CO | | | SCAC3 |
| 40 | CAAQ | CALCO TRANSPORTATION INC | | | SCAC4 |
| 41 | CAAR | CAMPOS ARREDONDO, RUFINO | | | SCAC4 |
| 42 | CAAS | CASCADAS COMPANIA ARMADORA S A | | | SCAC3 |
| 43 | CAAS | CASCADAS COMPANIA ARMADORA S A | | | SCAC4 |
| 44 | CAAT | CALIFORNIA AMMONIA TRANSPORT INC | | | SCAC3 |
| 45 | CAAU | CAI INTERNATIONAL | | USA | BIC |
| 46 | CAAU | Cai International | | | RSRV |
| 47 | CAAV | CACTUS RECYCLING INC | | | SCAC4 |
| 48 | CAAW | CONTE, A A INC | | | SCAC3 |
| 49 | CAAX | MHC Inc., Wholly Owned Subsidiary of ConAgra Foods | added 1/2002; eliminated 7/2002 | | NAKINA |
| 50 | CAAX | MHC Inc., Wholly Owned Subsidiary of ConAgra, Inc. | added 10/1992; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 51 | CAAX | Arrow Industries, Inc. | added 4/1990; eliminated 10/1992 | | NAKINA |
| 52 | CAAX | The Calumet & Arizona Mining Co. | 8/1920-7/1930 | | NAKINA |
| 53 | CAAX | Arrow Industries, Inc. | added 4/90; eliminated 10/92 | | NRHS |
| 54 | CAAX | MHC Inc., Wholly Owned Subsidiary of ConAgra, Inc. | added 10/92; 1/94-7/2000 | | NRHS |
| 55 | CAAX | MHC, INC., WHOLLY OWNED SUB. OF CONAGRA, INC. | | | PWRC |
| 56 | CAAY | C&A TRANSPORTATION, INC | | | SCAC3 |
| 57 | CAB | Chesapeake Air Service | Callsign: Chesapeake Air, | USA | AVCODES |
| 58 | CAB | Chesapeake Air Service | | | ICAO1 |
| 59 | CAB | Cementa AB | | SE | VKM |
| 60 | CABA | CABALLERO EXPRESS INC | | | SCAC4 |
| 61 | CABB | CABBAGE INC | | | SCAC4 |
| 62 | CABC | CABARRUS CONSOLIDATING & MANAGEMENT COMPANY | | | SCAC3 |
| 63 | CABE | CAMPBELL ENTERPRISES | | | SCAC3 |
| 64 | CABF | CAL-BROS TRUCKING INC | | | SCAC3 |
| 65 | CABF | CABRAL TRANSPORT | | | SCAC4 |
| 66 | CABG | CABRAL, A J TRUCKING | | | SCAC3 |
| 67 | CABG | CABALLERO GATELUM, MARTIN | | | SCAC4 |
| 68 | CABH | CAMPBELL, NOLAN INC | | | SCAC3 |
| 69 | CABI | CAL-BAY EXPRESS INC | | | SCAC3 |
| 70 | CABI | COVER-ALL BUILDING SYSTEMS | | | SCAC4 |
| 71 | CABJ | CALI BAJA TRANSPORTES S DE RL DE | | | SCAC4 |
| 72 | CABK | CASON INC | | | SCAC4 |
| 73 | CABL | CAB TRUCKING | | | SCAC3 |
| 74 | CABM | CARIBBEAN TRANSPORTATION, INC | | | SCAC3 |
| 75 | CABM | C & A TRUCK BROKERAGE INC | | | SCAC4 |
| 76 | CABN | CARIBBEAN SEA CARRIER | | | SCAC3 |
| 77 | CABO | CABOOL TRANSPORT INC | | | SCAC3 |
| 78 | CABP | CAMPBELL CLAN TRANSPORTATION INC | | | SCAC3 |
| 79 | CABQ | CAMBRIDGE IRON & METAL CO INC | | | SCAC3 |
| 80 | CABR | CABRINI MOVING SERVICE, INC | | | SCAC3 |
| 81 | CABR | CABRINI MOVING SERVICE, INC | | | SCAC4 |
| 82 | CABT | C A T TRUCKING INC | | | SCAC3 |
| 83 | CABU | CHAKIAT AGENCIES PVT LTD | | IND | BIC |
| 84 | CABU | BACARDI & COMPANY LTD. | | | PWRC |
| 85 | CABU | Chakiat Agencies | | | RSRV |
| 86 | CABV | C A B TRANSPORTATION CORP | | | SCAC3 |
| 87 | CABW | C-AIR BROKERS & FORWARDERS INC | | | SCAC4 |
| 88 | CABX | Cabot Corp. | added 1/1961; 4/1961-7/2000; eliminated 1/2003; added 4/2005; 7/2005 | | NAKINA |
| 89 | CABX | Cabot Carbon Co. | 7/1935-10/1957; eliminated 1/1961 | | NAKINA |
| 90 | CABX | Cabot Carbon Co. | 4/38-10/57 | | NRHS |
| 91 | CABX | Cabot Corp. | 4/61-7/2000 | | NRHS |
| 92 | CABX | CABOT CORPORATION | | | PWRC |
| 93 | CABX | CABOT CORPORATION | | | PWRC |
| 94 | CABX | Cabot Corporation | | | RSRV |
| 95 | CABX | CABOT CORP | | | SCAC3 |
| 96 | CABY | CABY TRANSPORTATION CO | | | PWRC |
| 97 | CABY | C A B CONSTRUCTION LLC | | | SCAC4 |
| 98 | CABZ | CALUMET BUSINESS CENTER | | | PWRC |
| 99 | CAC | Conquest Airlines | Callsign: Conquest Air, | USA | AVCODES |
| 100 | CAC | California Air Charter | Callsign: Calair, | USA | AVCODES |
