| 4401 | WT | Wasaya Airways L.P. | ICAO: WSG, Callsign: Wasaya, Designator WT recalled by IATA. IATA designator changed from WG*. Name changed from Wasaya Airways Ltd. | CDN | AVCODES |
| 4402 | WT | Swiftair, S.A. | ICAO: SWT, Callsign: Swift, IATA Prefix: 227, | E | AVCODES |
| 4403 | WT | Swiftair, S.A. | ICAO: SWT, Callsign: Swift, IATA Prefix: 221, IATA Prefix code changed from 227. | E | AVCODES |
| 4404 | WT | Weldwood Transportation Ltd. | 1/1975-1/1980 | | NAKINA |
| 4405 | WT | Weldwood Transportation Ltd. | 1/75-1/80 | | NRHS |
| 4406 | WT | *WELDWOOD TRANSPORTATION LTD. | | | PWRC |
| 4407 | WT | *WICHITA TERMINAL | | | PWRC |
| 4408 | WT | Weldwood Transportation | | | RSRV |
| 4409 | WT | WELDWOOD TRANSPORTATION LIMITED | | | SCAC4 |
| 4410 | WTA | Africa West | IATA: 3L, Callsign: West Togo, IATA Prefix: 858, Designator 3L* recalled by IATA | TG | AVCODES |
| 4411 | WTA | Africa West | IATA: FK, Callsign: West Togo, IATA Prefix: 858, Designator FK recalled by IATA. IATA Desginator changed from FK*. Designator 3L* recalled by IATA | TG | AVCODES |
| 4412 | WTA | Africa West | IATA: FK, Callsign: West Togo, IATA Prefix: 858, IATA Desginator changed to FK. Designator 3L* recalled by IATA | TG | AVCODES |
| 4413 | WTA | Africa West | IATA: FK | | ICAO1 |
| 4414 | WTA | WICHITA TERMINAL ASSOCIATION | | | PWRC |
| 4415 | WTA | WICHITA TERMINAL ASSOCIATION | | | SCAC4 |
| 4416 | WTAC | WILLIAMS TRUCKING | | | SCAC4 |
| 4417 | WTAE | WILCO TRANSPORTATION SERVICES INC | | | SCAC4 |
| 4418 | WTAG | WARDEN FARMS TRUCKING LLC | | | SCAC4 |
| 4419 | WTAH | WESTERN TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 4420 | WTAK | WHITLOW TRUCKING | | | SCAC4 |
| 4421 | WTAL | WORLDTRANS AIR-SEA SERVICE LTD | | | SCAC4 |
| 4422 | WTAP | WALLACE TRANSPORT | | | SCAC1 |
| 4423 | WTAP | WALLACE TRANSPORT | | | SCAC4 |
| 4424 | WTAQ | WALLER TRANSPORT & EQUIPMENT INC | | | SCAC4 |
| 4425 | WTAR | WHITETAIL TRUCKING INC | | | SCAC4 |
| 4426 | WTAS | WESTERN TRAILER SERVICE INC | | | SCAC4 |
| 4427 | WTAU | WILTRADING PTY LTD | | | SCAC4 |
| 4428 | WTAV | WESTS TRANSPORTATION SOLUTIONS LLC | | | SCAC4 |
| 4429 | WTAW | WIREDTIME.COM INC | | | SCAC4 |
| 4430 | WTB | Wutachtalbahn e.V. | Fützen | D | privat-bahn.de |
| 4431 | WTB | Dampflok-Gemeinschaft 41096 e.V | | DE | VKM |
| 4432 | WTBA | WALLEY'S TRUCKING | | | SCAC4 |
| 4433 | WTBB | Stadt Blumberg-Wutachtalbahn | | DE | VKM |
| 4434 | WTBC | West Towns Bus Company | City: Chicago | USA | TRAFFIC |
| 4435 | WTBJ | WEBB TRANSPORT LLC | | | SCAC4 |
| 4436 | WTBM | WELLS TRUCKING | | | SCAC4 |
| 4437 | WTBN | WILSON TRANSPORT SERVICE LLC | | | SCAC4 |
| 4438 | WTBO | WAREHOUSE TRANSPORT ASSOCIATES INC | | | SCAC4 |
| 4439 | WTBS | WATTS BROTHERS MOVING & STORAGE SYS | | | SCAC4 |
| 4440 | WTBT | WALL TO WALL ENTERPRISES INC | | | SCAC4 |
| 4441 | WTBV | WINEBARGER TRUCKING | | | SCAC4 |
| 4442 | WTBY | WILLIAMS TRANSPORTATION | | | SCAC4 |
| 4443 | WTC | Weasua Air Transport Company Limited (WATCO) | Callsign: Watco, | LB | AVCODES |
| 4444 | WTC | Weasua Air Transport Company | | | ICAO1 |
| 4445 | WTC | WEYERHAUSER TIMBER CO. | | | PWRC |
| 4446 | WTCA | WALCOTT, PETER E & ASSOCIATES LIMIT | | | SCAC4 |
| 4447 | WTCD | WESTCAN AIRCRAFT SALES & SALVAGE LT | | | SCAC4 |
| 4448 | WTCL | WESTRAN INC | | | SCAC4 |
| 4449 | WTCM | WORLD TRAFFIC DE MEXICO | | | SCAC4 |
| 4450 | WTCN | WESTERN TRANSPORTATION CO INC | | | SCAC4 |
| 4451 | WTCO | Western Transportation Co. | 1/1975-7/2005 | | NAKINA |
| 4452 | WTCO | Western Transportation Co. | 1/75-7/2000 | | NRHS |
| 4453 | WTCO | WESTERN TRANSPORTATION CO. | | | PWRC |
| 4454 | WTCO | Western Transportation | | | RSRV |
| 4455 | WTCO | WHEELING TRANSPORTATION COMPANY INC | | | SCAC4 |
| 4456 | WTCQ | WASTECO | | | SCAC4 |
| 4457 | WTCS | WILLIAMS TRUCKING CO INC | | | SCAC4 |
| 4458 | WTCV | WTC | | | SCAC4 |
| 4459 | WTCW | WOLSIFER TRUCKING LLC | | | SCAC4 |
| 4460 | WTCX | Weyerhauser Timber Co. | added 10/1958; eliminated 1/1960 | | NAKINA |
| 4461 | WTCX | Weyerhauser Co. | added 1/1960; 4/1961-4/1970; eliminated 4/1974 | | NAKINA |
| 4462 | WTCX | Atlantic Terminals Inc. | added 4/1974; 1/1975; eliminated 4/1977 | | NAKINA |
| 4463 | WTCX | Weyerhauser Co. | added 4/1977; 1/1980-7/2000; eliminated 10/2000; 7/2005 (not listed) | | NAKINA |
| 4464 | WTCX | Weyerhauser Timber Co. | added 10/58; eliminated 1/60 | | NRHS |
| 4465 | WTCX | Weyerhauser Co. | added 1/60; 4/61-4/70 | | NRHS |
| 4466 | WTCX | Atlantic Terminals Inc. | Jan-75 | | NRHS |
| 4467 | WTCX | Weyerhauser Co. | 1/80-7/2000; eliminated 10/2000 | | NRHS |
| 4468 | WTCX | WEYERHAUSER COMPANY (ATLANTIC TERMINALS, INC.) | | | PWRC |
| 4469 | WTCX | Weyerhaeuser | | | RSRV |
| 4470 | WTCY | WELBORN TRUCKING CO INC | | | SCAC4 |
| 4471 | WTD | | City: Woltersdorf | D | TRAFFIC |
| 4472 | WTDA | WASHINGTON TRUCKING | | | SCAC4 |
| 4473 | WTDB | WALLENIUS TRANSROLL DO BRASIL LTDA | | | SCAC4 |
| 4474 | WTDE | WADE TRUCKING LLC | | | SCAC4 |
| 4475 | WTDI | WEE-TOTE DELIVERY SSERVICES | | | SCAC4 |
| 4476 | WTDK | WESTERN TRANSPORT | | | SCAC4 |
| 4477 | WTDR | WESTON TRANSPORTATION & LOGISTICS | | | SCAC4 |
| 4478 | WTDS | W T DISTRIBUTORS INC | | | SCAC4 |
| 4479 | WTDV | WEST TRUCKING INC | | | SCAC4 |
| 4480 | WTDW | WALLER TRUCKING LLC | | | SCAC4 |
| 4481 | WTEC | WATERTEC IRRIGATION LTD | | | SCAC4 |
| 4482 | WTEI | WILMER TOURS AND EXECUTIVE | | | SCAC4 |
| 4483 | WTEJ | WALLACE TRUCKING | | | SCAC4 |
| 4484 | WTEL | WEST TO EAST LOGISTICS | | | SCAC4 |
| 4485 | WTEM | WILSON TRUCKING SERVICE INC | | | SCAC4 |
| 4486 | WTEN | WEST TEXAS EXPRESS INC | | | SCAC4 |
| 4487 | WTEO | WHITE OIL COMPANY LLC | | | SCAC4 |
| 4488 | WTEP | WESTEX, INC | | | SCAC1 |
| 4489 | WTEQ | WILDCAT TRUCKING ENTERPRISES INC | | | SCAC4 |
| 4490 | WTER | WINTER GARDENS QUALITY FOODS | | | SCAC4 |
| 4491 | WTEU | WORLD WIDE TRANSPORT | | | SCAC4 |
| 4492 | WTEV | WTS TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 4493 | WTEW | WORLDWIDE TRUCKING EXPEDITORS INC | | | SCAC4 |
| 4494 | WTEX | WASTE CONTROL SPECIALISTS LLC | | | SCAC4 |
| 4495 | WTF | West African Air Transport | Callsign: Westaf Airtrans, | SN | AVCODES |
| 4496 | WTF | West African Air Transport | | | ICAO1 |
| 4497 | WTFF | WAINWRIGHT TRANSFER COMPANY OF FAYE | | | SCAC4 |
| 4498 | WTFG | WHITE, F G CO INC | | | SCAC4 |
| 4499 | WTFH | WARRIOR, THE SERVICE TRANSPORTATION | | | SCAC4 |
| 4500 | WTFI | WORLD TRAFFIC INC | | | SCAC4 |
