| 1 | WQ | Romanian Aviation Company ROMAVIA R.A. | ICAO: RMV, Callsign: Aeromavia, IATA Prefix: 534, Designator WQ reinstated by IATA. Declared bankrupt and ceased operations in August 2014. | RO | AVCODES |
| 2 | WQ | Bahamas World Airlines (1974) Ltd. | ICAO: WQA, Callsign: Whiskey Quebec, | BS | AVCODES |
| 3 | WQ | Interstate Equipment Leasing, Inc. d/b/a Swift Air | ICAO: SWQ, Callsign: Swiftflight, IATA designator changed from Q7. | USA | AVCODES |
| 4 | WQ | iAero Airways d/b/a Swift Air | ICAO: SWQ, Callsign: Swiftflight, Name changed from Interstate Equipment Leasing, Inc. d/b/a Swift Air. IATA designator changed from Q7. | USA | AVCODES |
| 5 | WQA | Bahamas World Airlines (1974) Ltd. | IATA: WQ, Callsign: Whiskey Quebec, | BS | AVCODES |
| 6 | WQAX | Warner-Quinlan Co. | 8/1920-7/1930 | | NAKINA |
| 7 | WQAX | WARNER-QUINLAN CO. | | | PWRC |
| 8 | WQGC | WINDSOR G | | | SCAC4 |
| 9 | WQIN | WINDLE, W W | | | SCAC4 |
| 10 | WQMI | WINNISQUAM MARINE INC | | | SCAC4 |
| 11 | WQOC | WESTPHAL OIL CO | | | SCAC4 |
| 12 | WQSS | WORLD SEAS SHIPPING LINE INC | | | SCAC4 |
