| 2401 | WISN | WHITE, R D & SONS INC | | | SCAC4 |
| 2402 | WISO | WISAMCO TRANSPORTATION LLC | | | SCAC4 |
| 2403 | WISR | WATANI INTERNATIONAL SERVICE INC | | | SCAC4 |
| 2404 | WISS | WEST INDIAN SHIPPING COMPANY | | | PWRC |
| 2405 | WIST | WILLISTON-SCOBEY TRANSFER | | | SCAC1 |
| 2406 | WISU | W.I.S.A. | | | PWRC |
| 2407 | WISW | WORLDWIDE (INTEGRATED SUPPLY CHAIN | | | SCAC4 |
| 2408 | WISX | Wisconsin Power and Light Co. | added 7/1969; 4/1970-1/1980; eliminated 1/1990; 1/1994 (not listed) | | NAKINA |
| 2409 | WISX | Alliant Energy | added 4/2000; 7/2000-7/2005 | | NAKINA |
| 2410 | WISX | Wisconsin Power and Light Co. | added 7/69; 4/70-1/80; eliminated 1/90; 1/94 | | NRHS |
| 2411 | WISX | Alliant Energy | added 4/2000; 7/2000 | | NRHS |
| 2412 | WISX | ALLIANT ENERGY [WISCONSIN POWER & LIGHT COMPANY] | | | PWRC |
| 2413 | WISX | Wisconsin Power and Light | | | RSRV |
| 2414 | WISX | ALLIANT ENERGY | | | SCAC4 |
| 2415 | WIT | Wittering FTU | Callsign: Striker, | GB | AVCODES |
| 2416 | WIT | Wittering FTU | | | ICAO1 |
| 2417 | WITC | WITRICITY | | | SCAC4 |
| 2418 | WITF | WISCONSIN TRANSFER CO INC | | | SCAC4 |
| 2419 | WITI | WEST ISLAND TOWING | | | SCAC4 |
| 2420 | WITJ | WIT TRANSPORTATION LLC | | | SCAC4 |
| 2421 | WITL | WINTERS TRUCK LINE, INC | | | SCAC1 |
| 2422 | WITP | WILL TRANSPORT INC | | | SCAC4 |
| 2423 | WITR | WILSON TRANSFER CO | | | SCAC1 |
| 2424 | WITR | WILSON TRANSFER CO (A CORP) | | | SCAC4 |
| 2425 | WITT | WITTERS TRANSPORTATION INC | | | SCAC4 |
| 2426 | WITTF | Baugesellschaft Wittfeld GmbH | | DE | VKM |
| 2427 | WITU | LANXESS ORGANOMETALLICS GMBH | | D | BIC |
| 2428 | WITU | CROMPTON GMBH | | | SCAC4 |
| 2429 | WITV | WOMEN IN THE INDUSTRY FUEL | | | SCAC4 |
| 2430 | WITX | Witco Carbon Co. | 1/1950-7/1954; eliminated 10/1956 | | NAKINA |
| 2431 | WITX | Continental Carbon Co. | added 4/1958; 4/1961-1/1980; eliminated 1/1985 | | NAKINA |
| 2432 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Chemical Corp. | added 1/1985; eliminated 4/1986 | | NAKINA |
| 2433 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Corp. | added 4/1986; 1/1994 | | NAKINA |
| 2434 | WITX | Continental Carbon Co. | eliminated 1/1999 | | NAKINA |
| 2435 | WITX | General Electric Railcar Services Corp. | added 1/1999; eliminated 1/2000 | | NAKINA |
| 2436 | WITX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005; eliminated 4/2006 | | NAKINA |
| 2437 | WITX | CCC Transport Co. | added 4/2006 | | NAKINA |
| 2438 | WITX | Witco Carbon Co. | Jan-52 | | NRHS |
| 2439 | WITX | Continental Carbon Co. | 4/61-1/80; eliminated 1/85 | | NRHS |
| 2440 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Chemical Corp. | added 1/85; eliminated 4/86 | | NRHS |
| 2441 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Corp. | added 4/86; 1/94 | | NRHS |
| 2442 | WITX | Continental Carbon Co. | eliminated 1/99 | | NRHS |
| 2443 | WITX | General Electric Railcar Services Corp. | added 1/99; eliminated 1/2000 | | NRHS |
| 2444 | WITX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 2445 | WITX | *CONTINENTAL CARBON CO., SUBS. WITCO CORP. | | | PWRC |
| 2446 | WITX | +CCC TRANSPORT CO. [GENERAL ELECTRIC RAIL SERVICES CORP.] | | | PWRC |
| 2447 | WITX | Continental Carbon | | | RSRV |
| 2448 | WITX | CCC TRANSPORT COMPANY | | | SCAC4 |
| 2449 | WITY | WILLIAMS, TYRONE TRUCKING | | | SCAC4 |
| 2450 | WIVB | WIVB-TV | | | SCAC4 |
| 2451 | WIW | V-Avia Airline Ltd | Callsign: Vee-Avia, | UA | AVCODES |
| 2452 | WIW | V-avia Airline | | | ICAO1 |
| 2453 | WIWH | WINGS & WHEELS DELIVERY | | | SCAC4 |
| 2454 | WIWI | WI WOODTONE INDUSTRIES | | | SCAC4 |
| 2455 | WIWL | WAPITI ISLAND WHITETAILS | | | SCAC4 |
| 2456 | WIWR | Wisconsin Western R.R. Co. | added 10/1982; eliminated 1/1986 | | NAKINA |
| 2457 | WIWR | Wisconsin Western R.R. Co. | added 10/82; eliminated 1/86 | | NRHS |
| 2458 | WIWR | WISCONSIN WESTERN RAILROAD | | | PWRC |
| 2459 | WIWR | Wisconsin Western Railroad | | | RSRV |
| 2460 | WIX | Western Industries Co. | 8/1920-7/1923 | | NAKINA |
| 2461 | WIX | Watson Industries Inc. | 7/1937 (not listed) | | NAKINA |
| 2462 | WIX | *WESTERN INDUSTRIES CO. | | | PWRC |
| 2463 | WIX | *WATSON INDUSTRIES INC. | | | PWRC |
| 2464 | WIXL | WILOS EXPRESS INC | | | SCAC4 |
| 2465 | WIXR | WINDSOR X-PRESS | | | SCAC4 |
| 2466 | WIZ | Merlin Flying College Limited | Callsign: Wizard, Name changed to Information Sciences (Scotland) Ltd. | GB | AVCODES |
| 2467 | WIZ | Information Sciences (Scotland) Ltd. | Callsign: Wizard, Name changed from Merlin Flying College Limited then changed to MicroMatter Technology Solutions Ltd. | GB | AVCODES |
| 2468 | WIZ | MicroMatter Technology Solutions Ltd. | Callsign: Wizard, Name changed from Information Sciences (Scotland) Ltd. | GB | AVCODES |
| 2469 | WIZ | Micromatter Technology Solutions | | | ICAO1 |
| 2470 | WJ | Labrador Airways Limited | ICAO: LAL, Callsign: Lab Air, IATA Prefix: 927, Name changed to Air Labrador Limited. ICAO callsign changed to Air Labrador. Designator WJ reinstated by IATA | CDN | AVCODES |
| 2471 | WJ | Webjet Linhas Aéreas | ICAO: WEB, Callsign: Webjet, IATA designator changed to WH*. | BR | AVCODES |
| 2472 | WJ | Nihon Kinkyori Airways | ICAO: NKK, Callsign: Kinkyiro, Name changed to Air Nippon Co. Ltd. | J | AVCODES |
| 2473 | WJ | Air Nippon Co. Ltd. | ICAO: NKK, Callsign: Ank Air, ICAO designator changed to ANK. Name changed from Nihon Kinkyori Airways. | J | AVCODES |
| 2474 | WJ | Air Labrador Limited | ICAO: LAL, Callsign: Air Labrador, IATA Prefix: 927, Ceased operations in June 2017. Name changed from Labrador Airways Limited. ICAO callsign changed from Lab Air. Designator WJ reinstated by IATA | CDN | AVCODES |
| 2475 | WJ | JetSmart Airlines S.A. | ICAO: JES, Callsign: Smartbird, | RA | AVCODES |
| 2476 | WJ | West Jersey R.R. Co. | 1/1994 | | NAKINA |
| 2477 | WJ | West Michigan R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 2478 | WJ | West Jersey R.R. Co. | Jan-94 | | NRHS |
| 2479 | WJ | West Michigan R.R. Co. | Jul-00 | | NRHS |
| 2480 | WJ | *WEST JERSEY RAILROAD COMPANY | | | PWRC |
| 2481 | WJ | +WEST MICHIGAN RAILROAD COMPANY | | | PWRC |
| 2482 | WJ | West Michigan Railroad | | | RSRV |
| 2483 | WJ | Weber & Junge GmbH | | DE | VKM |
| 2484 | WJA | Westjet Airlines Ltd. | IATA: WS, Callsign: Westjet, IATA Prefix: 838, Name changed to Westjet | CDN | AVCODES |
| 2485 | WJA | Westjet Airlines Ltd. | IATA: M3, Callsign: Westjet, IATA designator changed to WS | CDN | AVCODES |
| 2486 | WJA | Westjet | IATA: WS, Callsign: Westjet, IATA Prefix: 838, Name changed from Westjet Airlines Ltd. | CDN | AVCODES |
| 2487 | WJA | WestJet | IATA: WS | | ICAO1 |
| 2488 | WJAK | WAGNER, JOHN A TRUCKING LLC | | | SCAC4 |
| 2489 | WJAL | WRODA, JIM AUCTION SERVICES LTD | | | SCAC4 |
| 2490 | WJAS | WYMAN, JASPER AND SON | | | SCAC4 |
| 2491 | WJCL | WJC LLC | | | SCAC4 |
| 2492 | WJDH | WILLIAMS, J D HOTSHOT SERVICE LLC | | | SCAC4 |
| 2493 | WJDK | WAGNER, JAMES D TRUCKING | | | SCAC4 |
| 2494 | WJDT | WILLIAMS, J & D | | | SCAC4 |
| 2495 | WJEA | WILLIAMS, JOHN AND ELLEN ANTIQUES | | | SCAC4 |
| 2496 | WJES | WYNN, JESSE | | | SCAC4 |
| 2497 | WJGD | WHITE, JASON GERARD | | | SCAC4 |
| 2498 | WJHG | W J H II TRUCKING LLC | | | SCAC4 |
| 2499 | WJHI | WOLFORD, J H TRUCKING | | | SCAC4 |
| 2500 | WJIT | WEBER, JIM TRUCKING INC | | | SCAC4 |
