| 1 | WES | Western Express Air Lines, Inc. | Callsign: West Ex, | CDN | AVCODES |
| 2 | WES | Rainbow International Airlines, Inc. | Callsign: West Indian, | VI | AVCODES |
| 3 | WES | Western Express Air Lines | | | ICAO1 |
| 4 | WES | WESTERN TRANSPORTATION INC | | | SCAC4 |
| 5 | WES | Bremen-Thedinghauser Eisenbahn GmbH (Weserbahn) | | D | TRAFFIC |
| 6 | WESA | WESTERN AG INC | | | SCAC4 |
| 7 | WESE | WOODARD EUBANKS & SONS LLP | | | SCAC4 |
| 8 | WESEL | Kleinbahn Wesel-Rees-Emmerich | City: Wesel, Betreiber:Rheinisch-Westfälische Straßen- und Kleinbahnen GmbH, eröffnet 1914, stillgelegt 1966 | D | TRAFFIC |
| 9 | WESF | WESTSIDE BROKERS | | | SCAC4 |
| 10 | WESG | WestVerkehr Gmbh | City: Geilenkirchen | D | TRAFFIC |
| 11 | WESH | WEST HILLS OIL CO INC | | | SCAC4 |
| 12 | WESI | WESTON TRUCK LINES INC | | | SCAC4 |
| 13 | WESK | WESS INC | | | SCAC4 |
| 14 | WESM | WEST MOTOR FREIGHT OF PA | | | SCAC4 |
| 15 | WESN | WESSON INC | | | SCAC4 |
| 16 | WESO | WESTERN OIL INC | | | SCAC4 |
| 17 | WESP | WESTERN PACIFIC LOGISTICS | | | SCAC4 |
| 18 | WESQ | WESCAN DISPOSAL (1998) LTD | | | SCAC4 |
| 19 | WESR | WEST EXPRESS INC | | | SCAC4 |
| 20 | WEST | WEIRTON STEEL | | | PWRC |
| 21 | WEST | WESTCO TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 22 | WEST | Westbahn Management GmbH | Real: WSTBA | A | TRAFFIC |
| 23 | WEST | Westermann GmbH & Co. KG | | DE | VKM |
| 24 | WESTB | Westbahn GmbH | | DE | VKM |
| 25 | WESTL | Westfälische Localbahn e.V | | DE | VKM |
| 26 | WESTM | Westminster Omnibus Company | City: London | GB | TRAFFIC |
| 27 | WESU | WESTERN GLOBAL HOLDINGS LIMITED | | GB | BIC |
| 28 | WESU | WESTERN | | | SCAC4 |
| 29 | WESV | Wes Pro Fleet Services | | | SCAC2 |
| 30 | WESV | WES PRO FLEET SERVICES INC | | | SCAC4 |
| 31 | WESX | B.C. Timber Ltd. | added 1/1984; eliminated 7/1984 | | NAKINA |
| 32 | WESX | Westar Timber Ltd. | added 7/1984; eliminated 7/1986; 1/1994-7/2005 (not listed) | | NAKINA |
| 33 | WESX | B.C. Timber Ltd. | eliminated 7/84 | | NRHS |
| 34 | WESX | Westar Timber Ltd. | added 7/84; eliminated 7/86; 1/94-7/2000 | | NRHS |
| 35 | WESX | WESTAR TIMBER LTD [BC TIMBER, LTD.] | | | PWRC |
| 36 | WESX | Westar Timber (BC Timber) | | | RSRV |
| 37 | WESX | Wessex Trains | Wessex Trains was the primary passenger rail operator in the South West of England. The company operated trains in the region bounded by Penzance, Cardiff, Gloucester, Worcester and Brighton. In addition to running trains, Wessex Trains was responsible for the operation of 125 passenger stations. Wessex Trains merged with First Great Western and First Great Western Link on 1 April 2006. The new franchise is operated by First Group and all its services operate under the name First Great Western. | GB | TRAFFIC |
| 38 | WESXB | Wessex Bus | | GB | TRAFFIC |
| 39 | WESY | WINNING EAGLE SERVICES INC | | | SCAC4 |
| 40 | WESZ | WEST ERIE SHORTLINE | | | PWRC |
