| 1 | GOP | Gospa Air, S.A. De C.V. | Callsign: Gospa Air, | MEX | AVCODES |
| 2 | GOP | GULF OIL CORP. (PENNSYLVANIA) | | | PWRC |
| 3 | GOPA | GARCIA OLIVELLA, PEDRO ALBINO | | | SCAC4 |
| 4 | GOPE | GO PETRO TRANSPORT LLC | | | SCAC4 |
| 5 | GOPI | GO TRANSPORT INC | | | SCAC4 |
| 6 | GOPPEL | Göppel Bus GmbH | | D | TRAFFIC |
| 7 | GOPS | GOLDENPORT SHIPMANAGEMENT LTD | | | SCAC4 |
| 8 | GOPT | GOTHENBURG PIT STOP INC | | | SCAC4 |
| 9 | GOPX | Southeastern Natural Gas Corp. | added 4/1962; eliminated 10/1962 | | NAKINA |
| 10 | GOPX | Gas-Oil Products, Inc. | 1/1945-4/1961; eliminated 4/1962 | | NAKINA |
| 11 | GOPX | Gas-Oil Products, Inc. | 1/52-4/61; eliminated 4/62 | | NRHS |
| 12 | GOPX | Southeastern Natural Gas Corp. | added 4/62 | | NRHS |
| 13 | GOPX | SOUTHEASTERN NATURAL GAS CORP. [GAS-OIL PRODUCTS, INC.] | | | PWRC |
