| 1 | GUE | Aero Servicio Guerrero, S.A. de C.V. | Callsign: Aero Guerrero, | MEX | AVCODES |
| 2 | GUED | GUERRA CARDENAS, ARTURO | | | SCAC4 |
| 3 | GUEE | GULF EUROPE EXPRESS | | | PWRC |
| 4 | GUEI | GUERRA RODRIGUEZ, PABLO | | | SCAC4 |
| 5 | GUEQ | GTA-US EXPRESS INC | | | SCAC4 |
| 6 | GUEX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 7 | GUEX | General American Transportation Corp. | added 4/1971; 1/1975-1/1994; eliminated 1/1998 | | NAKINA |
| 8 | GUEX | General American Transportation Corp. | added 4/71; 1/75-1/94; eliminated 1/98 | | NRHS |
| 9 | GUEX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 10 | GUEX | GENERAL AMERICAN MARKS CO. [GENERAL AMERICAN TRANSPORTATION CORP.] | | | PWRC |
| 11 | GUEX | General American Marks (GATX Corporation) | | | RSRV |
