| 1 | ETP | Empire Test Pilots School | Callsign: Tester, ICAO designator changed from TPS | GB | AVCODES |
| 2 | ETPC | EAST PENINSULA INC | | | SCAC3 |
| 3 | ETPC | ETP TRANSPORTES SA DE CV | | | SCAC4 |
| 4 | ETPE | EXTRA EXPRESS | | | SCAC4 |
| 5 | ETPI | EAGLE TRANSPORTATION | | | SCAC3 |
| 6 | ETPI | EASTERN TRANSPORT INC | | | SCAC4 |
| 7 | ETPL | ELIET TRANSPORT & LEASING CORP | | | SCAC3 |
| 8 | ETPL | ELITE THREE PL (3PL) | | | SCAC4 |
| 9 | ETPM | EASTWAY TANK PUMP & METER LTD | | | SCAC4 |
| 10 | ETPN | EXPEDITED TRANSPORTATION AFFILIATES | | | SCAC3 |
| 11 | ETPO | EXCEL TRANSPORT INC | | | SCAC3 |
| 12 | ETPR | EAGLE TRANSPORT & RIGGING INC | | | SCAC3 |
| 13 | ETPR | EOS TRANSPORT INC | | | SCAC4 |
| 14 | ETPS | ET TRANSPORTATION SERVICES INC | | | SCAC4 |
| 15 | ETPT | EXECUTIVE TRANSPORT LINES INC | | | SCAC3 |
| 16 | ETPX | Merchants Despatch Transportation Corp. | 7/1937-4/1938; 1/1941 (not listed) | | NAKINA |
| 17 | ETPX | East Tennessee Packing Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 18 | ETPX | East Tennessee Packing Co. | 7/1930-7/1932 | | NAKINA |
| 19 | ETPX | East Tennessee Packing Co. (Merchants Despatch Transportation Corp.) | Apr-38 | | NRHS |
| 20 | ETPX | EAST TENNESSEE PACKING CO. (MERCHANTS DESPATCH TRANSPORTATION CORP.) | | | PWRC |
| 21 | ETPY | ERMAR SEA TRANSPORTATION COMPANY IN | | | SCAC3 |
