| 1 | DQ | Air Limousin | | F | AVCODES |
| 2 | DQ | Quikjet Cargo Airlines Pvt. Ltd | | IND | AVCODES |
| 3 | DQ | Delta Connection Limited | ICAO: DCP, IATA Prefix: 521, Name changed to Air Direct Connect Limited. | EAK | AVCODES |
| 4 | DQ | Air Europa | ICAO: AEA, | E | AVCODES |
| 5 | DQ | Coastal Air Transport, Inc. | ICAO: CXT, Callsign: Coastal, IATA Prefix: 457, Designator DQ recalled by IATA | VI | AVCODES |
| 6 | DQ | Air Direct Connect Limited | IATA Prefix: 521, Name changed from Delta Connection Limited. | EAK | AVCODES |
| 7 | DQ | Alexandria Airlines | ICAO: KHH, | ET | AVCODES |
| 8 | DQA | Island Aviation Services Ltd. | IATA: Q2, Callsign: Island Aviation, IATA Prefix: 986, IATA Prefix code reinstated. | MV | AVCODES |
| 9 | DQA | Island Aviation Services | | | ICAO1 |
| 10 | DQAV | DAVISON & SONS TRUCKING | | | SCAC4 |
| 11 | DQE | De Queen and Eastern R.R. Co. | 1/1975-7/2005 | | NAKINA |
| 12 | DQE | De Queen and Eastern R.R. Co. | 1/75-7/2000 | | NRHS |
| 13 | DQE | DE QUEEN & EASTERN RAILROAD CO. | | | PWRC |
| 14 | DQE | De Queen and Eastern Railroad | | | RSRV |
| 15 | DQI | Cimber Air, Sonderjyllands Flyveselskab | IATA: QI, Callsign: Cimber, IATA Prefix: 647, ICAO designator changed to CIM | DK | AVCODES |
| 16 | DQLI | DARA LOGISTICS INC | | | SCAC4 |
| 17 | DQLR | DIRECT LOGISTICS TRANSPORT | | | SCAC4 |
| 18 | DQMA | DUQUE, MIGUEL ANGEL | | | SCAC4 |
| 19 | DQMS | DISTRICT MOVING & STORAGE INC | | | SCAC4 |
