| 1 | WTN | Warton BAe | Callsign: Tarnish, Name changed to Warton Military Flight Ops | GB | AVCODES |
| 2 | WTN | Warton Military Flight Ops | Callsign: Tarnish, Name changed from Warton Bae | GB | AVCODES |
| 3 | WTN | BAE Systems | | | ICAO1 |
| 4 | WTNE | WEST TENN EXPRESS INC | | | SCAC4 |
| 5 | WTNI | WATTRANS INC | | | SCAC4 |
| 6 | WTNN | West Tennessee R.R. Corp. | added 10/1984; eliminated 1/1988; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 7 | WTNN | West Tennessee R.R., LLC | added 1/2002; 7/2005 | | NAKINA |
| 8 | WTNN | West Tennessee R.R. Corp. | added 10/84; eliminated 1/88; 1/94-7/2000 | | NRHS |
| 9 | WTNN | WEST TENNESSEE RAILROAD LLC | | | PWRC |
| 10 | WTNN | West Tennessee Railroad Corporation | | | RSRV |
| 11 | WTNR | WATSON, ROB | | | SCAC4 |
| 12 | WTNU | WEITRON INC | | USA | BIC |
