| 1 | TRS | AirTran Airways, Inc. | IATA: FL, Callsign: Citrus, IATA Prefix: 332, Fully integrated into Southwest Airlines on 28 December 2014. Commenced operations on 17 November 1997. ICAO designator changed from MTE. On September 27, 2010, Southwest Airlines announced they would acquire AirTran Airways. | USA | AVCODES |
| 2 | TRS | AirTran Airways | IATA: FL | | ICAO1 |
| 3 | TRS | TRINITES s.r.o. | | SK | VKM |
| 4 | TRSB | TRI-STATE BUTANE CO INC | | | SCAC4 |
| 5 | TRSC | TRANSPORTES SANCHEZ SANCHEZ SA DE C | | | SCAC4 |
| 6 | TRSE | TRANSPORTES SALCEDO | | | SCAC4 |
| 7 | TRSF | TRANSPORTATION SERVICES INC | | | SCAC4 |
| 8 | TRSH | TRANSPORTES SA-RA | | | SCAC4 |
| 9 | TRSL | TRAILER SHIP LINES INC | | | PWRC |
| 10 | TRSL | TRANSOURCE LLC | | | SCAC4 |
| 11 | TRSN | TRANSPORTES REASA | | | SCAC4 |
| 12 | TRSO | TRANSPORTES LOPEZ | | | SCAC4 |
| 13 | TRSOD | Transoda Sp. Z o.o. | | PL | VKM |
| 14 | TRSQ | TERESI TRUCKING, INC | | | SCAC1 |
| 15 | TRSQ | TERESI TRUCKING LLC | | | SCAC4 |
| 16 | TRSR | TRANSIT SERVICES INC | | | SCAC4 |
| 17 | TRSS | TRI-R SYSTEMS | | | SCAC4 |
| 18 | TRST | TRI STATE OIL CO | | | SCAC4 |
| 19 | TRSU | FEDERTRASPORTI SPA | | I | BIC |
| 20 | TRSU | TRANSCONEX, INC. | | | PWRC |
| 21 | TRSU | Transconex | | | RSRV |
| 22 | TRSU | STS TRANSCHIMICA SRL | | | SCAC4 |
| 23 | TRSV | TRANSERV INC | | | SCAC4 |
| 24 | TRSW | TRUSWOOD INC | | | SCAC4 |
| 25 | TRSX | Transrail Systems, Inc. | added 10/1969; 4/1970; eliminated 4/1972 | | NAKINA |
| 26 | TRSX | California Tank Car Line, Inc. | added 4/1972; 1/1975-1/1980; eliminated 4/1981 | | NAKINA |
| 27 | TRSX | North American Car Corp. | added 4/1981; eliminated 1/1984 | | NAKINA |
| 28 | TRSX | General Electric Railcar Services Corp. | added 1/1984; eliminated 1/1986 | | NAKINA |
| 29 | TRSX | Endasa, S.A. de C.V. | eliminated 4/1989; 1/1994 (not listed) | | NAKINA |
| 30 | TRSX | Transrail Systems, Inc. | added 10/69; 4/70; eliminated 4/72 | | NRHS |
| 31 | TRSX | California Tank Car Line, Inc. | added 4/72; 1/75-1/80; eliminated 4/81 | | NRHS |
| 32 | TRSX | North American Car Corp. | added 4/81 | | NRHS |
| 33 | TRSX | General Electric Railcar Services Corp. | eliminated 1/86 | | NRHS |
| 34 | TRSX | Endasa, S.A. de C.V. | eliminated 4/89; 1/94 | | NRHS |
| 35 | TRSX | *GENERAL ELECTRIC RAILCAR SERVICES CORP. [NORTH AMERICAN CAR CORP.; CALIFORNIA TANK CAR LINE, INC.; TRANSRAIL SYSTEMS, INC.] | | | PWRC |
| 36 | TRSX | *(ENDX) ENDASA SA DE CV | | | PWRC |
| 37 | TRSX | *TEXAS RAILROAD SWITCHING | | | PWRC |
| 38 | TRSX | Transrail Systems (GE Rail Services) | | | RSRV |
| 39 | TRSZ | TRIPLE CROWN SERVICE | | | PWRC |
