| 1 | GPT | Promodal Transportes Aereos Ltda | Callsign: Promodal, Established in 2003. Operations ceased in 2004. | BR | AVCODES |
| 2 | GPTB | GREAT PLAINS TRANSPORTATION INC | | | SCAC4 |
| 3 | GPTBEL | Gorodskoy Passazhirsoy Transport Belgorod | | RUS | TRAFFIC |
| 4 | GPTC | G&P TRUCKING COMPANY, INC. | | | SCAC1 |
| 5 | GPTC | G & P TRUCKING COMPANY INC | | | SCAC4 |
| 6 | GPTD | G & P TRUCKING | | | SCAC4 |
| 7 | GPTE | GENERAL GAS CARRIER CORPORATION III | | | SCAC4 |
| 8 | GPTH | GREAT PLAINS TRANSPORT INC | | | SCAC4 |
| 9 | GPTI | G & P TRUCKING COMPANY INC (INTERMO | | | SCAC4 |
| 10 | GPTJ | GP THOMPSON ENTERPRISES | | | SCAC4 |
| 11 | GPTK | GINNETTI PETROLEUM TRANSPORTERS LLC | | | SCAC4 |
| 12 | GPTL | GROUPE TRANSPORT PAUL LESSARD (1982 | | | SCAC4 |
| 13 | GPTM | GPT INC | | | SCAC4 |
| 14 | GPTQ | G P G TRANSPORTATION LTD | | | SCAC4 |
| 15 | GPTR | GRUPO TRANSPORTISTA HG | | | SCAC4 |
| 16 | GPTX | Glenn-Pool Tank Line Co. | 8/1920 | | NAKINA |
| 17 | GPTX | GLENN=POOL TANK LINE CO. | | | PWRC |
| 18 | GPTY | GROUPE TRANSFER INC | | | SCAC4 |
