| 1 | ETT | ETT Aviation Services Limited | Callsign: Ettair, | GB | AVCODES |
| 2 | ETTA | ELECTRONIC TRANSPORT INC | | | SCAC3 |
| 3 | ETTC | E-TOWN TRUCKING COMPANY INC | | | SCAC3 |
| 4 | ETTC | E T TRUCKING LLC | | | SCAC4 |
| 5 | ETTD | ELITE TRANSPORTATION INC | | | SCAC4 |
| 6 | ETTE | ELLETT EXPRESS | | | SCAC3 |
| 7 | ETTE | E & T TRUCKING | | | SCAC4 |
| 8 | ETTG | E T TRUCKING | | | SCAC3 |
| 9 | ETTH | E T TRANSPORTATION INC | | | SCAC4 |
| 10 | ETTI | ELL TRANSPORT INC | | | SCAC3 |
| 11 | ETTK | ERNST TRUCKING | | | SCAC3 |
| 12 | ETTL | E T TRANSPORT AYERS CLIFF (1962) LT | | | SCAC3 |
| 13 | ETTL | ETA TRUCKING LLC | | | SCAC4 |
| 14 | ETTN | ENTERTAINMENT TRANSPORTATION | | | SCAC3 |
| 15 | ETTN | E T TRANSPORT | | | SCAC4 |
| 16 | ETTO | E T TRANSPORTATION INC | | | SCAC3 |
| 17 | ETTP | E THREE (3) TRANSPORT | | | SCAC4 |
| 18 | ETTR | ETTER, BRUCE | | | SCAC3 |
| 19 | ETTS | ETJ TRANSPORTATION SERVICES INC | | | SCAC3 |
| 20 | ETTS | E TWO (E2) TRANSPORT | | | SCAC4 |
| 21 | ETTT | EAST CONTINENTAL INC | | | SCAC3 |
| 22 | ETTT | EAST TENNESSEE TRUCK LINES INC | | | SCAC4 |
| 23 | ETTU | ELBTAINER GMBH | | D | BIC |
| 24 | ETTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 25 | ETTX | Trailer Train Co. | added 1/1962; 7/1965-1/1980; eliminated 1/1992 | | NAKINA |
| 26 | ETTX | Trailer Train Co. | added 1/1962 | | NAKINA |
| 27 | ETTX | Trailer Train Co. (FCS flat cars equipped with adjustable height tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 4/1963 | | NAKINA |
| 28 | ETTX | Trailer Train Co. (FA flat cars equipped with adjustable height tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 7/1965-10/1968 | | NAKINA |
| 29 | ETTX | Trailer Train Co. (flat cars equipped with elevating tri-level auto racks furnished by member railroads) | 4/1970 | | NAKINA |
| 30 | ETTX | Trailer Train Co./TTX Co. (flat cars equipped with fully enclosed tri-level auto racks furnished by participant railroads) | 1/1975-1/1994; eliminated 1/1992 | | NAKINA |
| 31 | ETTX | TTX Co. (flat cars, equipped with fully enclosed tri-level auto racks furnished by participant railroads, equipped with end of car cush.) | 7/2000 | | NAKINA |
| 32 | ETTX | Trailer Train Co. | added 1/62; 7/65 | | NRHS |
| 33 | ETTX | Trailer Train Co. (FA flat cars equipped with adjustable height tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 10/66-10/68 | | NRHS |
| 34 | ETTX | Trailer Train Co. | Apr-70 | | NRHS |
| 35 | ETTX | Trailer Train Co. (flat cars equipped with fully enclosed tri-level auto racks furnished by participant railroads) | 1/75-1/80; eliminated 1/92 | | NRHS |
| 36 | ETTX | TTX Co. (flat cars equipped with fully enclosed tri-level auto racks furnished by participant railroads) | added 1/92; 1/94 | | NRHS |
| 37 | ETTX | TTX Co. (flat cars, equipped with fully enclosed tri-level auto racks furnished by participant railroads, equipped with end of car cush.) | Jul-00 | | NRHS |
| 38 | ETTX | *EAST TEXAS TRANSPORTATION CO. | | | PWRC |
| 39 | ETTX | +TTX COMPANY | | | PWRC |
| 40 | ETTX | Trailer Train (TTX Corporation) | | | RSRV |
| 41 | ETTX | TTX COMPANY | | | SCAC4 |
