| 1 | GMS | Aeroservicios Gama, S.A. de C.V. | Callsign: Servicios Gama, | MEX | AVCODES |
| 2 | GMS | Ghadames Air | Callsign: Ghadames, | LAR | AVCODES |
| 3 | GMS | Aeroservicios Gama | | | ICAO1 |
| 4 | GMSA | GARCIA MIRELES, CESAR | | | SCAC4 |
| 5 | GMSE | GEM STATE TRANSPORTATION INC | | | SCAC4 |
| 6 | GMSG | GROVES MOVING & STORAGE CO | | | SCAC4 |
| 7 | GMSI | GRIFFIN MOVING SERVICES INC | | | SCAC4 |
| 8 | GMSJ | GMS TRANSPORT LLC | | | SCAC4 |
| 9 | GMSK | GEMINI MEXICO SA DE CV | | | SCAC4 |
| 10 | GMSL | GALMAR SHIPPING INTERNATIONAL | | | SCAC1 |
| 11 | GMSL | GMS TRANSPORTATION SYSTEMS LLC | | | SCAC4 |
| 12 | GMSM | GEMSTONE MINING ADVENTURES | | | SCAC4 |
| 13 | GMSO | GERBER MOVING & STORAGE INC | | | SCAC4 |
| 14 | GMSP | GEMINI MOVING SPECIALISTS, Mercury Van & Storage Co | | | SCAC1 |
| 15 | GMSR | Kansas City Southern Ry. Co. | added 7/1994; 7/2000-7/2005 | | NAKINA |
| 16 | GMSR | SouthRail Corp. | added 7/1988; 1/1994; eliminated 7/1994 | | NAKINA |
| 17 | GMSR | Gulf & Mississippi R.R. Corp. | added 10/1985; added 1/1986; eliminated 7/1988 | | NAKINA |
| 18 | GMSR | Gulf & Mississippi R.R. Corp. | added 1/86; eliminated 7/88 | | NRHS |
| 19 | GMSR | SouthRail Corp. | added 7/88; 1/94; eliminated 7/94 | | NRHS |
| 20 | GMSR | Kansas City Southern Ry. Co. | added 7/94; 7/2000 | | NRHS |
| 21 | GMSR | KANSAS CITY SOUTHERN RWY. CO. [SOUTHRAIL CORP.; GULF & MISSISSIPPI RR.] | | | PWRC |
| 22 | GMSR | Gulf & Mississippi Railroad (Kansas City Southern Railway) | | | RSRV |
| 23 | GMSS | GMS AUTOMOTIVE INC | | | SCAC4 |
