| 3301 | WOA | World Airways | IATA: WO | | ICAO1 |
| 3302 | WOAA | WANKLYN OIL CO INC | | | SCAC4 |
| 3303 | WOAI | WEST OAHU AGGREGATE CO INC | | | SCAC4 |
| 3304 | WOAK | WHITE OAK LOGISTICS INC | | | SCAC4 |
| 3305 | WOAL | WOODLAND TRANSFER | | | SCAC4 |
| 3306 | WOAX | Gulf States Corp. | 7/1930-7/1932 | | NAKINA |
| 3307 | WOAX | GULF STATES CORP. | | | PWRC |
| 3308 | WOB | Burlington Northern Inc. | added 10/1975; eliminated 1/1978; 1/1980 | | NAKINA |
| 3309 | WOB | Burlington Northern Inc. | eliminated 1/78; 1/80 | | NRHS |
| 3310 | WOB | BURLINGTON NORTHERN INC | | | PWRC |
| 3311 | WOBD | WOLDING, H O INC | | | SCAC4 |
| 3312 | WOBT | WRIGHT OIL INC | | | SCAC4 |
| 3313 | WOBX | Western Oil & Burner Co. | 1/1945 | | NAKINA |
| 3314 | WOBX | Western Oil Burner Co. | 1/1946 | | NAKINA |
| 3315 | WOBX | Western Oil & Burner Co. | 4/1947 | | NAKINA |
| 3316 | WOBX | Western Fruit Express Co. | 1/1952-1/1975; eliminated 1/1979 | | NAKINA |
| 3317 | WOBX | Western Fruit Express Co. | 1/52-1/75; eliminated 1/79 | | NRHS |
| 3318 | WOBX | *WESTERN OIL & BURNER CO. | | | PWRC |
| 3319 | WOBX | *BURLINGTON NORTHERN RAILROAD CO [WESTERN FRUIT EXPRESS CO.] | | | PWRC |
| 3320 | WOCA | WORCESTER COUNTY AIR FREIGHT, INC | | | SCAC1 |
| 3321 | WOCA | WORCESTER COUNTY AIR FREIGHT INC | | | SCAC4 |
| 3322 | WOCG | WELCH OIL CO LLC | | | SCAC4 |
| 3323 | WOCH | WESSELS OIL COMPANY INC | | | SCAC4 |
| 3324 | WOCJ | WHITEHEAD OIL COMPANY | | | SCAC4 |
| 3325 | WOCK | WOODBURY TRANSPORT LLC | | | SCAC4 |
| 3326 | WOCL | WOOLDRIDGE OIL COMP INC | | | SCAC4 |
| 3327 | WOCN | WALLACE OIL COMPANY INC | | | SCAC4 |
| 3328 | WOCO | WONDER TRANSPORT COMPANY | | | SCAC4 |
| 3329 | WOCP | WHEATLAND OIL COMPANY INC | | | SCAC4 |
| 3330 | WOCQ | WEBB OIL COMPANY | | | SCAC4 |
| 3331 | WOCR | WEST OIL COMPANY INC | | | SCAC4 |
| 3332 | WOCS | WOODSHED, THE | | | SCAC4 |
| 3333 | WOCT | WARNER OIL COMPANY INC | | | SCAC4 |
| 3334 | WOCV | WOC TRUCKING LLC | | | SCAC4 |
| 3335 | WOCX | Wadhams Oil Co. | 7/1935-4/1938 | | NAKINA |
| 3336 | WOCX | Socony-Vacuum Oil Co., Inc., Chicago Division | 1/1941-4/1947 | | NAKINA |
| 3337 | WOCX | Wadhams Oil Co. | Apr-38 | | NRHS |
| 3338 | WOCX | SOCONY-VACUUM OIL CO. [WADHAMS OIL CO.] | | | PWRC |
| 3339 | WOCX | Wadhams Oil Co. | | USA | TRAFFIC |
| 3340 | WOD | Woodgate Air Services | Callsign: Woodair, | GB | AVCODES |
| 3341 | WOD | WASHINGTON & OLD DOMINION RAILROAD | | | PWRC |
| 3342 | WOD | Washington and Old Dominion Railroad | | | RSRV |
| 3343 | WOD | Washington and Old Dominion Railroad | | USA | TRAFFIC |
| 3344 | WODC | W & O DISTRIBUTION CO INC | | | SCAC4 |
| 3345 | WODD | WOLDING, H O INC | | | SCAC4 |
| 3346 | WODH | WOODSTAR SHIPPING LLC | | | SCAC4 |
| 3347 | WODI | WOODYS LLC | | | SCAC4 |
| 3348 | WODK | WODEK SYSTEMS INC | | | SCAC4 |
| 3349 | WODL | WOLVERTON DRAY LINE | | | SCAC4 |
| 3350 | WODS | WOODSIDE TRANSPORTATION INC | | | SCAC4 |
| 3351 | WODX | Woburn Degreasing Co. | 7/1930-7/1932 | | NAKINA |
| 3352 | WODX | WOBURN DEGREASUNG CO. | | | PWRC |
| 3353 | WODZ | WOODENVILLE DAIRY | | | PWRC |
| 3354 | WOEC | WALCO ELECTRIC CO | | | SCAC4 |
| 3355 | WOEP | WHEELS ON EXPRESS INC | | | SCAC4 |
| 3356 | WOER | WOERPEL TRUCKING INC | | | SCAC4 |
| 3357 | WOET | WINGS OF EALES TRANSPORT INC | | | SCAC4 |
| 3358 | WOF | FFA Aviation (Pty) Ltd t/a Working on Fire | Callsign: Firewise, | ZA | AVCODES |
| 3359 | WOFA | WINDING OAKS FARM | | | SCAC4 |
| 3360 | WOFC | WOLFCREEK INC | | | SCAC4 |
| 3361 | WOFL | WISE OIL & FUEL INC | | | SCAC4 |
| 3362 | WOFR | WOLFE TRUCKING, INC | | | SCAC1 |
| 3363 | WOFR | WOLFE TRUCKING INC | | | SCAC4 |
| 3364 | WOFT | W O F TRUCKING LLC | | | SCAC4 |
| 3365 | WOHO | Wabash & Ohio R.R. | added 1/1995; eliminated 4/1995; 7/2000-7/2005 | | NAKINA |
| 3366 | WOHO | Wabash & Ohio R.R. | added 1/95; eliminated 4/95; 7/2000 | | NRHS |
| 3367 | WOHO | WABASH & OHIO RAILROAD | | | PWRC |
| 3368 | WOHO | Wabash and Ohio Railroad | | | RSRV |
| 3369 | WOID | WAYMAN OIL DISTRIBUTORS INC | | | SCAC4 |
| 3370 | WOIM | WATSON OIL COMPANY INC | | | SCAC4 |
| 3371 | WOIN | WALSMA OIL INC | | | SCAC4 |
| 3372 | WOIP | W O I PETROLEUM INC | | | SCAC4 |
| 3373 | WOIQ | WOLF ORGANIZATION INC, THE | | | SCAC4 |
| 3374 | WOIT | WOITALLA SERVICE INC | | | SCAC4 |
| 3375 | WOIV | WESTERN OIL INC ENVIRONMENTAL SERVI | | | SCAC4 |
| 3376 | WOK | Kovar Air | Callsign: Wokair, | CZ | AVCODES |
| 3377 | WOK | Kovar Air | | | ICAO1 |
| 3378 | WOKF | WHITE OAK FARMS | | | SCAC4 |
| 3379 | WOKL | WEST OAKLAND LOGISTICS | | | SCAC4 |
| 3380 | WOKO | WOKO TRANSPORTATION SERVICES INC | | | SCAC4 |
| 3381 | WOKS | WINGS OVER KISSISSING | | | SCAC4 |
| 3382 | WOKT | WHITE OAK TRANSPORT LIMITED | | | SCAC4 |
| 3383 | WOKX | Western Oil Corp. of Texas | 7/1932; 7/1937 (not listed) | | NAKINA |
| 3384 | WOKX | WESTERN OIL CORP. OF TEXAS | | | PWRC |
| 3385 | WOL | Wings Aviation Limited t/a Air guyana | IATA: WA, Callsign: Wingjet, | GUY | AVCODES |
| 3386 | WOL | Wings Aviation | | | ICAO1 |
| 3387 | WOLC | WESTLAKE ONE LLC | | | SCAC4 |
| 3388 | WOLD | WOLD, SIG STORAGE AND TRANSFER | | | SCAC4 |
| 3389 | WOLF | WOLFE MOTOR LINES INC | | | SCAC4 |
| 3390 | WOLF | Peter Wolf & Söhne | City: Chur | CH | TRAFFIC |
| 3391 | WOLFS | Wolf's Bus | | USA | TRAFFIC |
| 3392 | WOLH | WOLDING, H O INC | | | SCAC4 |
| 3393 | WOLI | WOOLSEY INC | | | SCAC4 |
| 3394 | WOLJ | WOMAN OWNED LOGISTICS INC | | | SCAC4 |
| 3395 | WOLK | WOLFE, K D TRUCKING | | | SCAC4 |
| 3396 | WOLT | WOLTERS, J TRUCKING LLC | | | SCAC4 |
| 3397 | WOLX | Westland Oil Co. | 1/1950-1/1952; eliminated 4/1953 | | NAKINA |
| 3398 | WOLX | Westland Oil Co. | Jan-52 | | NRHS |
| 3399 | WOLX | WESTLAND OIL CO. | | | PWRC |
| 3400 | WOLY | WOOLLEY FUEL COMPANY | | | SCAC4 |
