| 1 | QG | Delta Air Transport (D.A.T.) | ICAO: DAT, Callsign: Deltair, IATA designator changed to SN, ICAO designator changed to SAB | B | AVCODES |
| 2 | QG | Seychelles-Kilimanjaro Air Transport Ltd. | Callsign: Skat, | EAK | AVCODES |
| 3 | QG | Global Aviation Operations (PTY) Ltd | ICAO: GBB, Designator QG recalled by IATA | ZA | AVCODES |
| 4 | QG | PT. Citilink Indonesia | ICAO: CTV, Callsign: Supergreen, | RI | AVCODES |
| 5 | QG | PT Citilink Indonesia | Real: CTV | RI | TRAFFIC |
| 6 | QGA | Windrose Air | Callsign: Quadriga, | D | AVCODES |
| 7 | QGA | Windrose Air | | | ICAO1 |
| 8 | QGLI | QUEST GLOBAL LOGISTICS INC | | | SCAC4 |
| 9 | QGNO | QUALITY GROUP NEW ORLEANS, THE | | | SCAC3 |
| 10 | QGNO | QUIROGA MARTINEZ, JOSE ISAU | | | SCAC4 |
| 11 | QGRY | Quebec Gatineau Ry., Inc. | added 10/1998; 7/2000-7/2005 | | NAKINA |
| 12 | QGRY | Quebec Gatineau Ry., Inc. | added 10/98; 7/2000 | | NRHS |
| 13 | QGRY | QUEBEC GATINEAU RAILWAY | | | PWRC |
| 14 | QGRY | Quebec Gatineau Railway | | | RSRV |
| 15 | QGRY | QUEBEC GATINEAU RAILWAY INC | | | SCAC4 |
| 16 | QGRY | Quebec Gatineau Ry., Inc. | | CDN | TRAFFIC |
| 17 | QGVI | QUAD GLOBAL VENTURES INC | | | SCAC4 |
