| 1 | ETR | Helitour, S.L. | Callsign: Helitour, | E | AVCODES |
| 2 | ETR | Estelar Latinoamerica C.A. | IATA: E4, Callsign: Estel, | YV | AVCODES |
| 3 | ETR | Estelar Latinoamerica C.A. d/b/a Estelar | IATA: ES, Callsign: Estel, Designator E4 recalled by IATA. | YV | AVCODES |
| 4 | ETR | Eisenbahn- und Technikmuseum Rügen GmbH | Prora | D | privat-bahn.de |
| 5 | ETR | ESSEX TERMINAL | | | PWRC |
| 6 | ETR | Essex Terminal | | | RSRV |
| 7 | ETR | Echigo Tokimeki Railway | | J | TRAFFIC |
| 8 | ETRA | ERNEST TRANSPORTATION INC | | | SCAC3 |
| 9 | ETRE | ENTREPRISE M RICHARD ENR | | | SCAC4 |
| 10 | ETRF | EARLEY'S TRUCKING | | | SCAC4 |
| 11 | ETRI | ENGLISH TRUCKING, INC | | | SCAC3 |
| 12 | ETRI | ENGLISH TRUCKING INC | | | SCAC4 |
| 13 | ETRL | ENVOY TRANSPORATION LTD | | | SCAC3 |
| 14 | ETRL | ELITE TRANSPORTATION & LOGISTICS LL | | | SCAC4 |
| 15 | ETRM | EASTON TRANSPORTATION | | | SCAC4 |
| 16 | ETRN | EASTERN TRUCKING COMPANY, THE | | | SCAC3 |
| 17 | ETRN | ETRANS EXPRESS INC | | | SCAC4 |
| 18 | ETRO | EMPIRE TRANSPORTATION | | | SCAC3 |
| 19 | ETRP | EXPRESS TRANSPORTAITON INC | | | SCAC3 |
| 20 | ETRP | E TRANSPORTATION | | | SCAC4 |
| 21 | ETRQ | EASY TRANSPORTATION | | | SCAC4 |
| 22 | ETRR | EASTER RENTS INC | | | SCAC3 |
| 23 | ETRR | ELMA TRANSPORT | | | SCAC4 |
| 24 | ETRS | EXPEDITED TRANSPORTATION SERVICE IN | | | SCAC3 |
| 25 | ETRU | CJSC ELF FILLING | | RUS | BIC |
| 26 | ETRV | ELEETS TRUCKING | | | SCAC4 |
| 27 | ETRX | Arkansas Power & Light Co. | added 1/1996; 7/2000-7/2005 | | NAKINA |
| 28 | ETRX | Richards Tank Car Service | added 10/1961; 7/1965-10/1966; eliminated 7/1967 | | NAKINA |
| 29 | ETRX | Riley Bros. Oil Corp. (Evans-Thwing Refining Co.) | 8/1920 | | NAKINA |
| 30 | ETRX | Arkansas Power & Light Co. | added 1/96; 7/2000 | | NRHS |
| 31 | ETRX | *RILEY BROS. OIL CORP. [EVANS-THWING REFINING CO.] | | | PWRC |
| 32 | ETRX | +ARKANSAS POWER AND LIGHT COMPANY (RICHARDS TANK CAR SERVICE) | | | PWRC |
| 33 | ETRX | Evans-Thwing Refining (Arkansas Power and Light) | | | RSRV |
| 34 | ETRX | RICHARDS TANK CAR SERVICE | | | SCAC3 |
| 35 | ETRY | East Tennessee Ry., L.P. | added 4/1992; 1/1994-7/2000; eliminated 4/2004; 7/2005 | | NAKINA |
| 36 | ETRY | ET Ry., L.P. | added 1/1992; eliminated 4/1992 | | NAKINA |
| 37 | ETRY | East Tennessee Ry. Corp. | added 1/1984; eliminated 1/1992 | | NAKINA |
| 38 | ETRY | East Tennessee Ry. Corp. | eliminated 1/92 | | NRHS |
| 39 | ETRY | ET Ry., L.P. | added 1/92; eliminated 4/92 | | NRHS |
| 40 | ETRY | East Tennessee Ry., L.P. | added 4/92; 1/94-7/2000 | | NRHS |
| 41 | ETRY | EAST TENNESSEE RAILWAY, L.P. | | | PWRC |
| 42 | ETRY | East Tennessee Railway | | | RSRV |
| 43 | ETRY | EAST TENNESSEE RAILWAY, L P | | | SCAC3 |
| 44 | ETRY | EAST TENNESSEE RAILWAY, L P | | | SCAC4 |
