| 1 | UQ | O'Connor Airlines | ICAO: OCM, Callsign: O'Connor, Name changed from O'Connor-Mt. Gambier's Airline | AUS | AVCODES |
| 2 | UQ | London European Airways PLC | ICAO: LON, Callsign: European, Name changed to Ryanair Europe. | GB | AVCODES |
| 3 | UQ | Ryanair Eurpoe | ICAO: LON, Callsign: European, Merged into Ryanair Ireland. Name changed from London European Airways PLC. | GB | AVCODES |
| 4 | UQ | O'Connor-Mt. Gambier's Airline | ICAO: OCM, Callsign: O'Connor, Name changed to O'Connor Airlines | AUS | AVCODES |
| 5 | UQ | United African Airlines | | LAR | AVCODES |
| 6 | UQ | Sky Jet Aviation Ltd. | ICAO: SJA, | EAU | AVCODES |
| 7 | UQ | Urumqi Airlines Co. Ltd. | ICAO: CUH, Callsign: Loulan, IATA Prefix: 886, | PRC | AVCODES |
| 8 | UQA | Unique Air FZE | Callsign: Unicargo, | UAE | AVCODES |
| 9 | UQCS | UNIQUE COURIER SERVICE | | | SCAC4 |
| 10 | UQEP | UNIQUE EXPRESS INCORPORATED | | | SCAC4 |
| 11 | UQFI | UNIQUE FREIGHT SYSTEMS INC | | | SCAC4 |
| 12 | UQUE | UNIQUE TRANSPORTATION INC | | | SCAC4 |
