| 1 | CAO | Atlantic Air | Callsign: Atlantic Cape, | ZA | AVCODES |
| 2 | CAO | Air China Cargo Co., Ltd. | IATA: CA, Callsign: Airchina Freight, IATA Prefix: 999, | PRC | AVCODES |
| 3 | CAO | Air China Cargo | | | ICAO1 |
| 4 | CAO | Air China Cargo | | PRC | TRAFFIC |
| 5 | CAOB | CAPOBIANCO, BEN TRUCKING INC | | | SCAC3 |
| 6 | CAOD | CARROLL, STEVEN P INC | | | SCAC4 |
| 7 | CAOF | CARROLL TRANSPORTATION | | | SCAC3 |
| 8 | CAOG | CARROLL TRUCKING INC | | | SCAC3 |
| 9 | CAOI | CANDOR OIL COMPANY INC | | | SCAC4 |
| 10 | CAOJ | CARLOTTA STAR | | | SCAC4 |
| 11 | CAOK | CAROLINA TRANSPORT OF KERNERSVILLE | | | SCAC3 |
| 12 | CAOK | CASTELLON TRUCKING | | | SCAC4 |
| 13 | CAOL | CAROLS LIVERY SERVICE | | | SCAC3 |
| 14 | CAOL | CALOS TRANSPORT | | | SCAC4 |
| 15 | CAOM | CALIFORNIA MICROWAVE | | | SCAC3 |
| 16 | CAOO | CALLAHAN INTERNATIONAL INC | | | SCAC3 |
| 17 | CAOO | CAPOANO TRANSPORTATION LLC | | | SCAC4 |
| 18 | CAOP | C & P TRANSPORTATION COMPANY | | | SCAC3 |
| 19 | CAOQ | CALIFORNIA TRUCK LINES | | | SCAC3 |
| 20 | CAOQ | CADDO MOVERS OF LAWTON INC | | | SCAC4 |
| 21 | CAOR | CAIN OIL INC | | | SCAC4 |
| 22 | CAOS | CARLSON TRUCKING INC | | | SCAC3 |
| 23 | CAOT | CARON TRANSPORT LTD | | | SCAC3 |
| 24 | CAOT | CARON TRANSPORT LTD | | | SCAC4 |
| 25 | CAOU | INTERNATIONAL CAS CONTAINER CORPORA | | | SCAC4 |
| 26 | CAOV | CARPENTER TRANSFER | | | SCAC3 |
| 27 | CAOV | CALIFORNIA OVERLAND LTD | | | SCAC4 |
| 28 | CAOX | Westlake CA & O | added 7/1999; 7/2000-7/2005 | | NAKINA |
| 29 | CAOX | B.F. Goodrich Co.—Chemical Group | eliminated 7/1999 | | NAKINA |
| 30 | CAOX | The B.F. Goodrich Co. & Chemical Group | added 10/1995 | | NAKINA |
| 31 | CAOX | The B.F. Goodrich Co. & Chemical Group | added 10/95 | | NRHS |
| 32 | CAOX | B.F. Goodrich Co.--Chemical Group | eliminated 7/99 | | NRHS |
| 33 | CAOX | Westlake CA & O | added 7/99; 7/2000 | | NRHS |
| 34 | CAOX | *B. F. GOODRICH COMPANY - CHEMICAL GROUP | | | PWRC |
| 35 | CAOX | +WESTLAKE CA & O | | | PWRC |
| 36 | CAOX | Westlake CA and O | | | RSRV |
| 37 | CAOX | WESTLAKE CA & O | | | SCAC4 |
| 38 | CAOY | CAL-O-TRUX | | | SCAC3 |
| 39 | CAOY | CARROLL & CARROLL INC | | | SCAC4 |
