| 301 | WAR | NZ Warbirds Association | | | ICAO1 |
| 302 | WAR | Warrenton R.R. Co. | 1/1975; added 10/1979; 1/1980; eliminated 7/1987; eliminated 1/1988; added 10/1988; eliminated 7/1991; 1/1994-7/2005 | | NAKINA |
| 303 | WAR | Warrenton R.R. Co. | 1/75-1/80; eliminated 7/87; eliminated 1/88; added 10/88; eliminated 7/91; 1/94-7/2000 | | NRHS |
| 304 | WAR | WARRENTON RAILROAD CO. | | | PWRC |
| 305 | WAR | Warrenton Railroad | | | RSRV |
| 306 | WAR | WARRENTON RAILROAD COMPANY | | | SCAC4 |
| 307 | WAR | Miejskie Zakłady Komunikacyjne w Warszawie | Real: MZK, City: Warszawa, 1964 - 1994 | PL | TRAFFIC |
| 308 | WARB | WARREN TRANSPORT LTD | | | SCAC4 |
| 309 | WARBUS | Warbus sp. z o.o | City: Warszawa | PL | TRAFFIC |
| 310 | WARC | WESTERN ARCHRIB | | | SCAC4 |
| 311 | WARD | WARD TRUCKING CORPORATION | | | SCAC1 |
| 312 | WARD | WARD TRUCKING LLC | | | SCAC4 |
| 313 | WARH | WAR-HUNT TRUCKING CO | | | SCAC1 |
| 314 | WARJ | WATERS, J TRUCKING | | | SCAC4 |
| 315 | WARK | WARREN TRUCKING LLC | | | SCAC4 |
| 316 | WARM | WARD, MURRAY KENNETH | | | SCAC4 |
| 317 | WARN | WARNER CO. | | | PWRC |
| 318 | WARN | WARNER TRANSPORT | | | SCAC4 |
| 319 | WARQ | WHITE AND RED TRUCKING INCORPORATED | | | SCAC4 |
| 320 | WARS | WARSAY EXPRESS | | | SCAC4 |
| 321 | WARTBURG | Wartburg | | D | TRAFFIC |
| 322 | WARU | WARTSILA FINLAND OY | | FIN | BIC |
| 323 | WARU | WARTSILA FINLANO OY | | | SCAC4 |
| 324 | WARW | WHITE ARROW LLC | | | SCAC4 |
| 325 | WARW | Warwick Stages | | USA | TRAFFIC |
| 326 | WARY | WARD, A E TRANSPORT COMPANY | | | SCAC4 |
| 327 | WAS | Walsten Air Services (1986) Ltd. | Callsign: Walsten, | CDN | AVCODES |
| 328 | WAS | Walsten Air Services | | | ICAO1 |
| 329 | WAS | Waynesburg Southern | 1/1975-1/1980 | | NAKINA |
| 330 | WAS | Waynesburg Southern | 1/75-1/80 | | NRHS |
| 331 | WAS | WAYNESBURG SOUTHERN | | | PWRC |
| 332 | WAS | Waynesburg Southern | | | RSRV |
| 333 | WAS | Warsaw Airport Services Ltd. | | PL | TRAFFIC |
| 334 | WASC | WASTE CONTROL RECYCLING INC | | | SCAC4 |
| 335 | WASC | Wascosa | | D | TRAFFIC |
| 336 | WASCO | WASCOSA AG, Luzern | | CH | VKM |
| 337 | WASD | WILLARD AGRI-SERVICE OF GREENWOOD L | | | SCAC4 |
| 338 | WASE | WASATCH EXPRESS INC | | | SCAC4 |
| 339 | WASF | WILLARD AGRI-SERVICE OF FREDERICK I | | | SCAC4 |
| 340 | WASG | WASS TRUCKING CO | | | SCAC4 |
| 341 | WASH | WASHITA VALLEY TRUCKING CO LLC | | | SCAC4 |
| 342 | WASHS | Washington Street IBOA | | USA | TRAFFIC |
| 343 | WASI | WEST ASIA MARITIME OVERSEAS PRIVATE | | | SCAC4 |
| 344 | WASM | WASHINGTON MILLS TRANSPORT CORP. | | | SCAC4 |
| 345 | WASQ | WILLARD AGRI SERVICE OF MT AIRY | | | SCAC4 |
| 346 | WASR | WASS TRUCKING | | | SCAC4 |
| 347 | WASS | WALL STREET SYSTEMS INC | | | SCAC4 |
| 348 | WAST | WASTECORP PUMPS LLC | | | SCAC4 |
| 349 | WASV | WILLARD AGRI SERVICE OF LYNCH INC | | | SCAC4 |
| 350 | WASW | WILLAMETTE AG SERVICES INC | | | SCAC4 |
| 351 | WASX | Wm. A. Smith Construction Co., Inc. | added 7/1985; eliminated 4/1987 | | NAKINA |
| 352 | WASX | Wm. A. Smith Construction Co., Inc. | eliminated 4/87 | | NRHS |
| 353 | WASX | *WM. A. SMITH CONSTRUCTION CO., INC. | | | PWRC |
| 354 | WASX | +ALLEGHENY RAW MATERIALS, INC. | | | PWRC |
| 355 | WASX | ALLEGHENY RAW MATERIALS INC | | | SCAC4 |
| 356 | WASY | WASAYA PROP SHOP LIMITED PARTNERSHI | | | SCAC4 |
| 357 | WAT | Wings Air Transport Co. | | SUD | AVCODES |
| 358 | WAT | Wings Air Transport | | | ICAO1 |
| 359 | WATA | Watarase Keikoku Railway | | J | TRAFFIC |
| 360 | WATC | The Washington Terminal Co. | 1/1975-7/2005 | | NAKINA |
| 361 | WATC | The Washington Terminal Co. | 1/75-7/2000 | | NRHS |
| 362 | WATC | WASHINGTON TERMINAL CO. | | | PWRC |
| 363 | WATC | Washington Terminal | | | RSRV |
| 364 | WATC | WATSON TRUCKING | | | SCAC4 |
| 365 | WATC | Washington Terminal Company | | USA | TRAFFIC |
| 366 | WATCHUNG | Watchung Mountain Transit | | USA | TRAFFIC |
| 367 | WATCO | Watco Australia | | AUS | TRAFFIC |
| 368 | WATD | WASHINGTON TRUCK DISPATCH | | | SCAC4 |
| 369 | WATE | WATERSTONE PRODUCTS LTD | | | SCAC4 |
| 370 | WATH | WALTHALL OIL COMPANY | | | SCAC4 |
| 371 | WATI | WASHINGTON TRUCKING INC | | | SCAC4 |
| 372 | WATJ | WATSON TRANSPORTATION COMPANY | | | SCAC4 |
| 373 | WATK | WALTERS TRUCKING INC | | | SCAC4 |
| 374 | WATM | WATTS PETROLEUM CORP | | | SCAC4 |
| 375 | WATO | WATSON OIL COMPANY | | | SCAC4 |
| 376 | WATP | WAREHOUSE TRANSPORT SERVICES INC | | | SCAC4 |
| 377 | WATR | Waterville | 1/1975-1/1980 | | NAKINA |
| 378 | WATR | Water Carriers | 1/1994-7/2005 | | NAKINA |
| 379 | WATR | Waterville | 1/75-1/80 | | NRHS |
| 380 | WATR | Water Carriers | 1/94-7/2000 | | NRHS |
| 381 | WATR | *WATERVILLE RY. | | | PWRC |
| 382 | WATR | +WATER CARRIERS (CSD) | | | PWRC |
| 383 | WATR | Waterville Railroad | | | RSRV |
| 384 | WATS | WALSH TRUCKING SERVICE, INC | | | SCAC1 |
| 385 | WATS | WALSH TRUCKING SERVICE, INC | | | SCAC4 |
| 386 | WATT | WATT TRANSPORT INC | | | PWRC |
| 387 | WATT | WATT AND STEWART COMMODITIES INC | | | SCAC4 |
| 388 | WATU | WATERMAN STEAMSHIP CORPORATION | | | SCAC1 |
| 389 | WATU | WATERMAN STEAMSHIP CORP | | | SCAC4 |
| 390 | WATX | *WATAUGA VALLEY CHAPTER OF THE NTL. RWY. HISTORICAL SOC. | | | PWRC |
| 391 | WATX | *WATCO | | | PWRC |
| 392 | WATX | WATAUGA VALLEY CHAPTER OF THE NTL. | | | SCAC4 |
| 393 | WATZ | WESTERN AUTO | | | PWRC |
| 394 | WATZ | Western Auto | | | RSRV |
| 395 | WATZ | WESTERN AUTO | | | SCAC4 |
| 396 | WATZKE | Watzke GmbH | Teil der Dr. Richerd Firmengruppe | A | TRAFFIC |
| 397 | WAU | Wizz Air Ukraine, LLC | IATA: WU, Callsign: Wizzair Ukraine, Founded in 2008. Ceased operations on 20 April 2015. | UA | AVCODES |
| 398 | WAUU | WAUTERS GLOBAL LOGISTICS NV | | B | BIC |
| 399 | WAUU | WAUTERS TANKTRANSPORT NV | | | SCAC4 |
| 400 | WAV | Warbelow's Air Ventures, Inc. | IATA: 4W, Callsign: Ventaire, ICAO designator changed from VNA. ICAO callsign changed to Warbelow | USA | AVCODES |
