| 1 | QI | Cimber Air A/S | ICAO: CIM, Callsign: Cimber, IATA Prefix: 647, Namce changed to Cimber A/S / Cimber Sterling. ICAO designator changed from DQI | DK | AVCODES |
| 2 | QI | Cimber Air, Sonderjyllands Flyveselskab | ICAO: DQI, Callsign: Cimber, IATA Prefix: 647, ICAO designator changed to CIM | DK | AVCODES |
| 3 | QI | Cimber Sterling A/S | ICAO: CIM, Callsign: Cimber, IATA Prefix: 647, Ceased Operations and filed for bankruptcy on 03 May 2012. Namce changed from Cimber Air A/S. ICAO designator changed from DQI | DK | AVCODES |
| 4 | QI | Ibom Airlines Limited | ICAO: IAN, Callsign: Ibom, | WAN | AVCODES |
| 5 | QIBU | HAPAG LLOYD A.G | | D | BIC |
| 6 | QIBU | UNITED ARAB SHIPPING CO SAG | | | SCAC4 |
| 7 | QIC | Aero Quick | | MEX | AVCODES |
| 8 | QID | United States Air Force 100th Air Refueling Wing | Callsign: Quid, RAF Mildenhall | USA | AVCODES |
| 9 | QID | USAF 100th Air Refuelling Wing | | | ICAO1 |
| 10 | QIIC | QUANTUM INDUSTRIES INC | | | SCAC4 |
| 11 | QIKA | QUIKRETE OF SOUTHERN CAL LLC | | | SCAC4 |
| 12 | QIKD | QUICK DELIVERY INC | | | SCAC3 |
| 13 | QIKD | QING DAO JMS LOGISTICS SERVICE CO L | | | SCAC4 |
| 14 | QIKR | QUIK TRUCKING CO | | | SCAC3 |
| 15 | QIKS | QUICKSILVER TRANS-TPT CLEARING | | | SCAC3 |
| 16 | QIKS | QUIJADA GARCIA, JUAN FRANCO | | | SCAC4 |
| 17 | QILC | QUINTANILLA INTERNATIONAL LLC | | | SCAC4 |
| 18 | QIMC | QUALITY INTERMODAL CORPORATION | | | SCAC3 |
| 19 | QIMU | TCS TRANS S.L. | | E | BIC |
| 20 | QIMU | QUIMITRAN INTERMODAL S L | | | SCAC4 |
| 21 | QIND | QRT INCORPORATED | | | SCAC4 |
| 22 | QINQ | QUINNS DELIVERY SERVICE INC | | | SCAC3 |
| 23 | QINT | QUESTAR INTERNATIONAL LTD | | | SCAC4 |
| 24 | QISB | QUIMICA IBEROAMERICANA SA DE CV | | | SCAC4 |
| 25 | QISS | QUALITY INTERNATIONAL | | | SCAC4 |
| 26 | QIT | Quebec Iron & Titanium | | CDN | TRAFFIC |
| 27 | QITR | QUICKDROP IMPOUNDING TOWING & RECOV | | | SCAC4 |
| 28 | QITX | QIT-Fer Et Titane | 7/2005 (not listed)( | | NAKINA |
| 29 | QITX | QIT-FER ET TITANE (QUEBEC IRON & TITANIUM) | | | PWRC |
| 30 | QITX | QIT-FER ET TITANE INC | | | SCAC4 |
| 31 | QIZ | QUALITY INDUSTRY | | | PWRC |
