| 1 | THL | Air Thanet | | GB | AVCODES |
| 2 | THL | Ternhill (RAF) | Callsign: Ternhill, | GB | AVCODES |
| 3 | THL | Thameslink Rail Ltd. | 1999: 224km standard gauge, electrified at 25kV 50Hz and 750V= 3rd rail ~ | GB | TRAFFIC |
| 4 | THLA | THOMPSON, L A TRUCKING INC | | | SCAC3 |
| 5 | THLA | THALIA MARITIME COMPANY LIMITED | | | SCAC4 |
| 6 | THLC | THREE L INC | | | SCAC4 |
| 7 | THLD | THOLAND INC | | | SCAC3 |
| 8 | THLE | THRONE, LEONARD | | | SCAC3 |
| 9 | THLF | THREE CORD (3CORD) LOGISTICS LLC | | | SCAC4 |
| 10 | THLG | THOMPSON LOGISTICS LLC | | | SCAC4 |
| 11 | THLH | TROJAN HORSE LTD INC | | | SCAC4 |
| 12 | THLI | THRU LINE INC | | | SCAC3 |
| 13 | THLI | TRANSPORT HERVE LEMIEUX (1975) INC | | | SCAC4 |
| 14 | THLL | THREE NT (3NT) LLC | | | SCAC4 |
| 15 | THLN | THEILEN TRUCKING | | | SCAC3 |
| 16 | THLQ | THIELE TRANSPORTATION INC | | | SCAC3 |
| 17 | THLR | THOMAS, LOREN O | | | SCAC3 |
| 18 | THLR | THALER OIL CO INC | | | SCAC4 |
| 19 | THLS | THATCHER LIMOUSINE SERVICE | | | SCAC3 |
| 20 | THLS | TRANSTECH LOGISTICS | | | SCAC4 |
| 21 | THLU | TRAVERWAY MARITIME LTD | | | SCAC3 |
| 22 | THLV | THAMES LIVERY CORP LTD | | | SCAC3 |
| 23 | THLY | TAYLOR HAULING LLC | | | SCAC4 |
