| 4501 | WTFK | WHEATFIELD TRUCKING CO | | | SCAC4 |
| 4502 | WTFL | WESTCHART A/S | | | SCAC4 |
| 4503 | WTFN | WALL-TIES AND FORMS INC | | | SCAC4 |
| 4504 | WTFP | WELLS TRANSPORTATION LTD | | | SCAC4 |
| 4505 | WTFR | WILLIAMS TRANSFER & RIGGING INC | | | SCAC4 |
| 4506 | WTFT | WISTERIA TRANSPORT LTD | | | SCAC4 |
| 4507 | WTFU | WESTERN TANK SERVICES PTY LTD | | AUS | BIC |
| 4508 | WTGA | WT CARGO LLC | | | SCAC4 |
| 4509 | WTGE | WHITE TIGER EXPRESS | | | SCAC4 |
| 4510 | WTGG | WTG LOGISTICS INC | | | SCAC4 |
| 4511 | WTGH | WTG LOGISTICS INC (HIGHWAY DIVISION | | | SCAC4 |
| 4512 | WTGI | W TWO (W2) LOGISTICS INC | | | SCAC4 |
| 4513 | WTGL | WALTON TRUCKING 1992 LTD | | | SCAC4 |
| 4514 | WTGN | WTG LOGISTICS INC (CANADIAN INTERMO | | | SCAC4 |
| 4515 | WTGO | WAY TWO (2) GO LOGISTICS | | | SCAC4 |
| 4516 | WTGQ | WHITT TRANSFER & STORAGE CO | | | SCAC1 |
| 4517 | WTGY | WTG LOGISTICS INC (CANADIAN HIGHWAY | | | SCAC4 |
| 4518 | WTHC | WEATHERFORD CANADA PARTNERSHIP | | | SCAC4 |
| 4519 | WTHL | WEATHERLY TRUCK LINES INC | | | SCAC4 |
| 4520 | WTHP | WYETH PHARMACEUTICALS | | | SCAC4 |
| 4521 | WTHS | WETTERAU HOMESTEAD INC | | | SCAC4 |
| 4522 | WTHT | WHITEHEAD TRUCKING INC | | | SCAC4 |
| 4523 | WTIA | WILFER TRANSPORT INC | | | SCAC4 |
| 4524 | WTIC | WTI INC | | | SCAC4 |
| 4525 | WTID | WHOOPS TRANSPORT INC | | | SCAC4 |
| 4526 | WTIE | WESTERN TRANSPORTATION INC | | | SCAC4 |
| 4527 | WTIF | WHITEHALL TRANSPORTATION INC | | | SCAC4 |
| 4528 | WTII | WHITE TIMBER INDUSTRIES | | | SCAC4 |
| 4529 | WTIJ | WHITEWOOD TRANSPORT INC (BROKERAGE | | | SCAC4 |
| 4530 | WTIK | WELL TRUCKING INC | | | SCAC4 |
| 4531 | WTIM | WILKINSON TRUCKING INC | | | SCAC4 |
| 4532 | WTIN | W I T INC | | | SCAC4 |
| 4533 | WTIO | WASKOM TRANSPORT INC | | | SCAC4 |
| 4534 | WTIP | WARRIOR TRANSPORT INC | | | SCAC4 |
| 4535 | WTIQ | WISEMANS TRUCKING INC | | | SCAC4 |
| 4536 | WTIR | WINSCAR TRANSPORT INC | | | SCAC4 |
| 4537 | WTIS | WASHINGTON TRACTOR INC | | | SCAC4 |
| 4538 | WTIY | WOODSTOCK TRUCKING INC | | | SCAC4 |
| 4539 | WTJ | Whitejets Transportes Aereos Ltda. | IATA: W7, Callsign: Brasiljets, Founded in 2010. Commenced operations on 12 June 2010. Ceased operations during 2014. Parent company - Omni Aviation/White Airways. Was due to change name to POP Linhas A�reas but project was abandoned. | BR | AVCODES |
| 4540 | WTJM | WHITE, JIMMY | | | SCAC4 |
| 4541 | WTJN | WATSON, JOHN | | | SCAC4 |
| 4542 | WTJR | Wichita, Tillman & Jackson Ry. Co., Inc. | added 7/1991; eliminated 10/1991; 1/1994-7/2005 | | NAKINA |
| 4543 | WTJR | Wichita, Tillman & Jackson Ry. Co., Inc. | added 7/91; eliminated 10/91; 1/94-7/2000 | | NRHS |
| 4544 | WTJR | WICHITA, TILLMAN & JACKSON RAILWAY CO., INC. | | | PWRC |
| 4545 | WTJR | Wichita Tillman and Jackson Railway Inc | | | RSRV |
| 4546 | WTJR | WICHITA TILLMAN & JACKSON RAILWAY C | | | SCAC4 |
| 4547 | WTJT | WATTS, J TRUCKING LTD | | | SCAC4 |
| 4548 | WTJW | WATSON, J W TRUCKING INC | | | SCAC4 |
| 4549 | WTKA | WADDEN TRUCKING LIMITED | | | SCAC4 |
| 4550 | WTKB | WORLD TRUCK SPECIALIZED TRANSPORT I | | | SCAC4 |
| 4551 | WTKC | WILLIAMS & TWIGGS TRUCKING CO INC | | | SCAC4 |
| 4552 | WTKD | WILLIAMS TRUCKING REFRIGERATED INC | | | SCAC4 |
| 4553 | WTKE | WARTEK TRUCKING | | | SCAC4 |
| 4554 | WTKF | WESTBURNE TRUCKING | | | SCAC4 |
| 4555 | WTKG | WESTYS TRUCKING LLC | | | SCAC4 |
| 4556 | WTKJ | WHITAKER, JAMES | | | SCAC4 |
| 4557 | WTKK | WT TRUCKING LLC | | | SCAC4 |
| 4558 | WTKL | W R LIGGETT TRUCKING LLC | | | SCAC4 |
| 4559 | WTKM | WORLD TANKERS MANAGEMENT PTE LTD | | | SCAC4 |
| 4560 | WTKN | WEISGARBER TRUCKING INC | | | SCAC4 |
| 4561 | WTKP | WATTS TRUCKING COMPANY | | | SCAC4 |
| 4562 | WTKQ | WALLACE TRUCKING COMPANY | | | SCAC1 |
| 4563 | WTKQ | WALLACE TRUCKING COMPANY | | | SCAC4 |
| 4564 | WTKS | WILLIAMS TRUCKING SERVICES INC | | | SCAC4 |
| 4565 | WTKW | WIESE TRUCKING LLC | | | SCAC4 |
| 4566 | WTKX | Warren Tank Car Co. | 7/1935-4/1947 | | NAKINA |
| 4567 | WTKX | Warren Tank Car Co. | Apr-38 | | NRHS |
| 4568 | WTKX | WARREN TANK CAR CO. | | | PWRC |
| 4569 | WTKY | WILLYS TRUCKING | | | SCAC4 |
| 4570 | WTL | Atlantic Flight Training Ltd. | Callsign: Whittle, Purchased by Airways Aviation. | GB | AVCODES |
| 4571 | WTL | West Texas and Lubbock R.R. Co. Inc. | 7/2000-7/2005 | | NAKINA |
| 4572 | WTL | West Texas and Lubbock R.R. Co. Inc. | Jul-00 | | NRHS |
| 4573 | WTL | WEST TEXAS & LUBBOCK RAILROAD CO., INC. | | | PWRC |
| 4574 | WTL | West Texas and Lubbock Railroad | | | RSRV |
| 4575 | WTLA | WINTER TRUCK LINE | | | SCAC4 |
| 4576 | WTLB | WETZEL, JOHN E | | | SCAC4 |
| 4577 | WTLC | West Texas and Lubbock R.R. Co. | eliminated 1/2004 | | NAKINA |
| 4578 | WTLC | West Texas and Lubbock Ry. Co. | 7/2005 | | NAKINA |
| 4579 | WTLC | WEST TEXAS & LUBBOCK RAILROAD CO., INC. | | | PWRC |
| 4580 | WTLC | West Texas and Lubbock Railroad | | | RSRV |
| 4581 | WTLC | WEST TEXAS AND LUBBOCK RAILWAY COMP | | | SCAC4 |
| 4582 | WTLI | WESWEN TRUCK LINES INC | | | SCAC4 |
| 4583 | WTLJ | WHITE, L A TRUCKING CO INC | | | SCAC4 |
| 4584 | WTLK | WAITE, LEITH K | | | SCAC4 |
| 4585 | WTLM | WINDSPEAR TRANSPORTATION LTD | | | SCAC4 |
| 4586 | WTLP | WOODLAND TRANSPORTATION LLC | | | SCAC4 |
| 4587 | WTLQ | WESTERN TANKLINES | | | SCAC4 |
| 4588 | WTLR | West Texas and Lubbock R.R. Co. Inc. | added 1/1996; eliminated 7/1999; 7/2000-7/2005 | | NAKINA |
| 4589 | WTLR | West Texas and Lubbock R.R. Co. Inc. | added 1/96; eliminated 7/99; 7/2000 | | NRHS |
| 4590 | WTLR | WEST TEXAS & LUBBOCK RAILROAD CO., INC. | | | PWRC |
| 4591 | WTLR | West Texas and Lubbock Railroad | | | RSRV |
| 4592 | WTLR | WEST TEXAS AND LUBBOCK RAILROAD COM | | | SCAC4 |
| 4593 | WTLS | WELLS TRUCKING & LEASING INC | | | SCAC4 |
| 4594 | WTLU | WHITE LINE SHIPPING | | UAE | BIC |
| 4595 | WTLU | WHITE LINE SHIPPING | | | SCAC4 |
| 4596 | WTLW | WILLMAX TRUCKING LLP | | | SCAC4 |
| 4597 | WTLX | Washington Tank Car Co. | 8/1920 | | NAKINA |
| 4598 | WTLX | White Tank Line | 7/1930-7/1932 | | NAKINA |
| 4599 | WTLX | Western Tank Line | 4/1947-1/1950 | | NAKINA |
| 4600 | WTLX | Wilmot Transportation & Logistics Ltd. | added 1/2004; 7/2005; eliminated 4/2007 | | NAKINA |
