| 1 | GMT | Grupoaereo Monterrey, S.A. de C.V. d/b/a Magnicharters | Callsign: Grupomonterrey, Founded in 1994. Commenced operations in January 1995. | MEX | AVCODES |
| 2 | GMT | Grupoaereo Monterrey | | | ICAO1 |
| 3 | GMTF | G & M TRANSPORT | | | SCAC4 |
| 4 | GMTG | G AND M TRUCKING | | | SCAC4 |
| 5 | GMTH | GMT SHIPPING LINE LTD HONG KONG | | | SCAC4 |
| 6 | GMTI | GRIMES DISTRIBUTION SERVICES, INC | | | SCAC1 |
| 7 | GMTL | GIAMONNA TRANSPORT&LEASING CO | | | SCAC1 |
| 8 | GMTM | GENERAL MARITIME MANAGEMENT LLC | | | SCAC4 |
| 9 | GMTN | GOMEZ TRUCKING | | | SCAC4 |
| 10 | GMTS | GRIZZLY MOUNTAIN TRUCKING LLC | | | SCAC4 |
| 11 | GMTT | GEE, MIKE TRUCKING LTD | | | SCAC4 |
| 12 | GMTU | GAZ METRO TRANSPORT SOLUTIONS | | CDN | BIC |
| 13 | GMTU | GEMARTRANS VIETNAM CO LTD | | | SCAC4 |
| 14 | GMTV | G & M TRANSPORTATION SERVICES | | | SCAC4 |
| 15 | GMTX | Locomotive Leasing Partners, LLC | added 7/2005; 7/2005 (not listed) | | NAKINA |
| 16 | GMTX | General American Marks Co. | added 4/2005; eliminated 7/2005 | | NAKINA |
| 17 | GMTX | GATX RAIL LOCOMOTIVE GROUP {LOCOMOTIVE LEASING PARTNERS, LLC. (GENERAL AMERICAN MARKS CO.)] | | | PWRC |
| 18 | GMTX | General American Marks (GATX Corporation) | | | RSRV |
| 19 | GMTX | GATX RAIL LOCOMOTIVE GROUP LLC | | | SCAC4 |
| 20 | GMTX | GATX Rail Locomotive Group | | USA | TRAFFIC |
