| 1 | OQ | Express Air, Inc d/b/a Sunrise Airlines | ICAO: FXA, Callsign: Effex, Name changed to Sunrise Airlines Inc | USA | AVCODES |
| 2 | OQ | Sunrise Airlines, Inc. | ICAO: FXA, Callsign: Effex, Designator OQ* recalled by IATA. Name changed from Express Air, Inc d/b/a Sunrise Airlines | USA | AVCODES |
| 3 | OQ | Zambian Express Airways (19195) Limited | ICAO: SZX, Callsign: Zambex, Designator OQ recalled by IATA | Z | AVCODES |
| 4 | OQ | Aeronaves Queen S.A. (Queen Air) | ICAO: QNA, Callsign: Queen Air, | DOM | AVCODES |
| 5 | OQ | Chong Qing Airlines Co., Ltd | ICAO: CQN, Callsign: Chong Qing, Founded on 16 June 2007. Commenced operations on 08 July 2007. | PRC | AVCODES |
| 6 | OQ | Scoot Private Ltd | ICAO: SCO, Callsign: Scooter, IATA Prefix: 668, IATA Designator changed to TZ w.e.f. 14 May 2012. | SGP | AVCODES |
| 7 | OQDD | OSLO LADY LIMITED | | | SCAC3 |
| 8 | OQFI | ORIENT FREIGHT INTERNATIONAL INC | | | SCAC3 |
| 9 | OQGL | OFFSHORE LOGISTICS LLC | | | SCAC4 |
| 10 | OQLL | OQUINN LOGISTICS LLC | | | SCAC4 |
| 11 | OQNJ | OQUENDO, JOE TRUCKING | | | SCAC3 |
| 12 | OQNJ | OQUENDO, JOE TRUCKING | | | SCAC4 |
| 13 | OQNN | OQUINN TRUCK LINES INC | | | SCAC4 |
| 14 | OQPE | OSLO EMPRESS | | | SCAC3 |
| 15 | OQPS | OCTOPUS SHIPPING INC. | | | SCAC3 |
| 16 | OQTI | OPTIMUM QUALITY TRANSFERS INC | | | SCAC4 |
