| 1 | GPE | GP Express Airlines, Inc. | Callsign: Regional Express, | USA | AVCODES |
| 2 | GPE | GP Express Airlines | | | ICAO1 |
| 3 | GPEA | GRANITE PEAK TRANSPORTATION LLC | | | SCAC4 |
| 4 | GPEC | GRUPO ESCALANTE | | | SCAC4 |
| 5 | GPEF | GROUPE TARDIF INC | | | SCAC4 |
| 6 | GPEK | GO PLATINUM EXPRESS TRUCKING INC | | | SCAC4 |
| 7 | GPEP | GP EXPRESS | | | SCAC1 |
| 8 | GPEP | GARCES TRANSPORT | | | SCAC4 |
| 9 | GPEQ | G P EXPRESS INC | | | SCAC4 |
| 10 | GPES | GRAPEVINE EXPRESS | | | SCAC1 |
| 11 | GPET | GENERAL PETROLEUM | | | SCAC4 |
| 12 | GPEU | GP ELECTRONIQUE | | | SCAC4 |
| 13 | GPEX | General American Transportation Corp. | added 4/1970; 4/1970-1/1975; eliminated 10/1977; 1/1980-1/1994 | | NAKINA |
| 14 | GPEX | General American-Pfaudler Corp. | 7/1930-10/1966; eliminated 4/1970 | | NAKINA |
| 15 | GPEX | General American-Pfaudler Corp. | 4/38-10/66; eliminated 4/70 | | NRHS |
| 16 | GPEX | General American Transportation Corp. | added 4/70; 4/70-1/94 | | NRHS |
| 17 | GPEX | GENERAL AMERICAN TRANSPORTATION CORP [GEN. AMERICAN - PFAUDLER CO.] | | | PWRC |
| 18 | GPEX | General American Transportation Corporation (GATX Corporation) | | | RSRV |
| 19 | GPEY | GERMANSKY | | | SCAC4 |
