| 1 | CDO | Cargo Dor Limited | Callsign: Cargodor, | GH | AVCODES |
| 2 | CDO | Tchadia Airlines | IATA: OT, Callsign: Tchadia, Founded in 2018. Commenced operations on 01 October 2018. Ceased operations in August 2022. | TCH | AVCODES |
| 3 | CDOA | CD LOGISTICS | | | SCAC4 |
| 4 | CDOC | CAN DO EXPRESS CORP | | | SCAC3 |
| 5 | CDOC | CENTRO DE OPERACIONES DE BAJA CALIF | | | SCAC4 |
| 6 | CDOD | CODOTRANS INC | | | SCAC4 |
| 7 | CDOE | CAN DO ENTERPRISE | | | SCAC3 |
| 8 | CDOF | CAL DIVE OFFSHORE CONTRACTORS INC | | | SCAC4 |
| 9 | CDOG | CRESCENT DIAMOND TRUCKING | | | SCAC4 |
| 10 | CDOH | CROSSROADS COACH LINES INC | | | SCAC3 |
| 11 | CDOI | COACH D'OR INC | | | SCAC3 |
| 12 | CDOJ | CORDERO, A AUTO TRANSPORT | | | SCAC3 |
| 13 | CDOL | CONDOR APPLIANCE REPAIR | | | SCAC3 |
| 14 | CDOL | CONDOR SHIPPING LLC | | | SCAC4 |
| 15 | CDOM | CALIENDO TRUCKING | | | SCAC3 |
| 16 | CDOM | CASTLE DOME TRANSPORT LLC | | | SCAC4 |
| 17 | CDON | CORONADO TRUCKING INC | | | SCAC4 |
| 18 | CDOO | CONDOR | | | SCAC3 |
| 19 | CDOP | CASADO TRANSPORT INC | | | SCAC3 |
| 20 | CDOP | CARDIE OIL INC | | | SCAC4 |
| 21 | CDOQ | CONDON TRANSPORT INC | | | SCAC3 |
| 22 | CDOQ | CONDON TRANSPORT INC | | | SCAC4 |
| 23 | CDOR | CONDOR EXPRESS | | | SCAC3 |
| 24 | CDOS | CROWN DISTRIBUITON SERVICES | | | SCAC3 |
| 25 | CDOS | CARGA DOS | | | SCAC4 |
| 26 | CDOT | CONNECTICUT DEPARTMENT OF TRANSPORTATION | | | PWRC |
| 27 | CDOT | CORDIERO TRUCKING | | | SCAC3 |
| 28 | CDOT | Connecticut Department of Transportation | | USA | TRAFFIC |
