| 1 | XG | North American Airlines, Inc. | ICAO: NAO, Callsign: North American, IATA designator changed to NA | USA | AVCODES |
| 2 | XG | Air Mali International | ICAO: KLB, Callsign: Trans Mali, | RMM | AVCODES |
| 3 | XG | IMP Group Aviation Services Limited | ICAO: XGG, Designator XG recalled by IATA | CDN | AVCODES |
| 4 | XG | Clickair S.A. | ICAO: CLI, Meregd with Vueling Airlines S.A. Low cost subsidary of Iberia | E | AVCODES |
| 5 | XG | SunExpress Deutschland GmbH | ICAO: SXD, Callsign: Sunrise, Ceased operations on 26 June 2020. Joint venture of Lufthansa and Turkish Airlines. | D | AVCODES |
| 6 | XGA | General Aviation Terminal, Inc. | | CDN | AVCODES |
| 7 | XGA | General Aviation Terminal | | | ICAO1 |
| 8 | XGE | NG Eagle Limited | Callsign: Soaring Eagle, ICAO designator changed to XLE. ICAO Callsign changed to Aquila. | WAN | AVCODES |
| 9 | XGG | IMP Group Aviation Services Limited | Designator XG recalled by IATA | CDN | AVCODES |
| 10 | XGG | IMP Group Aviation Services Limited | IATA: XG, Designator XG recalled by IATA | CDN | AVCODES |
| 11 | XGG | IMP Group Aviation Services | | | ICAO1 |
| 12 | XGN | NexGen Flight Solutions, LLC | Callsign: Nexgen, | USA | AVCODES |
| 13 | XGO | Airgo Flugservice GmbH & Co. KG. | Callsign: Pastis, Name changed to AirGO Private Airline GmbH. | D | AVCODES |
| 14 | XGO | AirGO Private Airline GmbH | Callsign: Pastis, Name changed from Airgo Flugservice GmbH & Co. KG. | D | AVCODES |
| 15 | XGPR | X G PRODUCTIONS | | | SCAC4 |
| 16 | XGS | Global Systems, Inc. | Non-airline Org. in airline industry | USA | AVCODES |
| 17 | XGS | Global System | | | ICAO1 |
| 18 | XGSI | XPRESS GLOBAL SYSTEMS INC | | | SCAC4 |
| 19 | XGW | Global Weather Dynamics, Inc. | Non-airline Org. in airline industry | USA | AVCODES |
| 20 | XGW | Global Weather Dynamics | | | ICAO1 |
| 21 | XGWZ | (XTRZ) RETIRED 10-19-93 ATP | | | PWRC |
