| 1 | GX | Air Ontario | ICAO: ONT, Callsign: Ontario, Founded in June 1987. Merged into Air Canada Jazz in January 2001. Air Canada Connector | CDN | AVCODES |
| 2 | GX | Pacific Airways Corporation (Pacificair) | ICAO: PFR, Callsign: Pacific West, Ceased operations. | RP | AVCODES |
| 3 | GX | Global International Airways | ICAO: GAX, Callsign: Global, | USA | AVCODES |
| 4 | GX | Gill Air | ICAO: GIL, Callsign: Gillair, IATA designator changed to 9S | GB | AVCODES |
| 5 | GX | Great Lakes Airlines | | CDN | AVCODES |
| 6 | GX | JetMagic | ICAO: JMG, Callsign: Jet Magic, Ceased operations | IRL | AVCODES |
| 7 | GX | JetX Airlines | ICAO: JXX, Callsign: Jetbird, IATA Prefix: 591, Name changed to JetX ehf (Primera Air) | IS | AVCODES |
| 8 | GX | JetX ehf, (Primera Air) | ICAO: JXX, Callsign: Jetbird, IATA Prefix: 591, Name changed to Primera Air ehf (Jetx). Name changed from JetX Limited | IS | AVCODES |
| 9 | GX | Primera Air ehf (Jetx) | ICAO: JXX, Callsign: Jetbird, IATA Prefix: 591, Designator GX recalled by IATA. Name changed from JetX ehf, (Primera Air) | IS | AVCODES |
| 10 | GX | Luftline Georgia Ltd | ICAO: LLG, Callsign: Kakheti, IATA Prefix: 559, Ceased operations. | GE | AVCODES |
| 11 | GX | Guangxi Beibu Gulf Airlines Co., Ltd. | ICAO: CBG, Callsign: Spray, IATA Prefix: 872, Subsidary of Tianjin Airlines. ICAO callsign changed to Green City. | PRC | AVCODES |
| 12 | GX | Guangxi Beibu Gulf Airlines Co., Ltd. | ICAO: CBG, Callsign: Green City, IATA Prefix: 872, Subsidary of Tianjin Airlines. ICAO callsign changed from Spray. | PRC | AVCODES |
| 13 | GX | Gatwick Express Ltd. | 1999: 43km standard gauge, electrified at 750V= 3rd rail~ | GB | TRAFFIC |
| 14 | GX | Gatwick Express | | UK | VKM |
| 15 | GXA | Gulf Express Aviation B.S.C. (Closed) | Callsign: Gulf Express, | BRN | AVCODES |
| 16 | GXA | Global Crossing Airlines, Inc. | IATA: G6, Callsign: Gemini, IATA Prefix: 402, | USA | AVCODES |
| 17 | GXA | Grixona | | | ICAO1 |
| 18 | GXAI | GT TRANS INC | | | SCAC4 |
| 19 | GXCL | GXG LOGISTICS CORP | | | SCAC4 |
| 20 | GXCN | GRADEIS EXPRESS COMPANY INC | | | SCAC4 |
| 21 | GXCQ | GREENEX INTERNATIONAL INC | | | SCAC4 |
| 22 | GXEO | GEOX EXPRESS TRANSPORT CORP | | | SCAC4 |
| 23 | GXFE | GIGNOPUX, FRED E INC | | | SCAC4 |
| 24 | GXFL | GEN-X FREIGHT SERVICES LLC | | | SCAC4 |
| 25 | GXFS | GATX FREIGHT SYSTEMS, INC | | | SCAC1 |
| 26 | GXIC | GD XPRESS INC | | | SCAC4 |
| 27 | GXL | Star XL German Air Lines GmbH | Callsign: Stardust, Name changed to XL Airways Germany | D | AVCODES |
| 28 | GXL | XL Airways Germany GmbH | IATA: X4, Callsign: Stardust, Ceased operations on 14 December 2012. Filed for bankruptcy protection on 27 Dec 2012. | D | AVCODES |
| 29 | GXL | Star XL German Airlines | | | ICAO1 |
| 30 | GXLC | GENERAL TRANSFER LLC | | | SCAC4 |
| 31 | GXLL | GREEN TRANSPORT LLC | | | SCAC4 |
| 32 | GXLN | GVT XPRESS LINE | | | SCAC4 |
| 33 | GXLP | GENEX TERMINAL COMPANY | | | SCAC4 |
| 34 | GXLT | GOEX LTD | | | SCAC4 |
| 35 | GXLU | GE-EX LOGISTICS BV | | | SCAC4 |
| 36 | GXNT | GT & T TRANSPORT LTD | | | SCAC4 |
| 37 | GXPA | GRUPO EXPORTALIA INC | | | SCAC4 |
| 38 | GXPG | GENESIS EXPRESS & LOGISTICS INC | | | SCAC4 |
| 39 | GXPI | GLORY EXPRESS BROKERAGE | | | SCAC4 |
| 40 | GXPN | G TRANSPORT INC | | | SCAC4 |
| 41 | GXPP | GUERRERO EXPRESS INC | | | SCAC4 |
| 42 | GXRY | GALAXY RECYCLING INC | | | SCAC4 |
| 43 | GXRZ | GOLDEN SPIKE RAILROAD SERVICES | | | PWRC |
| 44 | GXSI | GRANT TRANSPORTATION SERVICES INC | | | SCAC4 |
| 45 | GXSS | GALAX SAS | | | SCAC4 |
| 46 | GXTN | GEN X TRANSPORTATION INC | | | SCAC4 |
| 47 | GXTP | GRACE TRANSPORT LLC | | | SCAC4 |
| 48 | GXTS | GX TRANSPORTATION SOLUTIONS INC | | | SCAC4 |
| 49 | GXTV | GREAT ESCAPES TOURS & TRAVEL LTD | | | SCAC4 |
| 50 | GXWC | GROULX, W C LOGISTICS | | | SCAC4 |
| 51 | GXY | Galaxy Airways Limited | Callsign: Gazelle, | WAN | AVCODES |
| 52 | GXY | Galaxy Airlines | IATA: J7, Callsign: Galax, Ceased Operations | J | AVCODES |
| 53 | GXY | Galaxy Airlines | | | ICAO1 |
| 54 | GXYI | GALAXY TRANSPORT INC | | | SCAC4 |
