| 1 | WO | World Airways, Inc. | ICAO: WOA, Callsign: World, IATA Prefix: 468, Founded on 29 March 1948. Ceased operations on 27 March 2014. Designator WO reinstated by IATA | USA | AVCODES |
| 2 | WO | World Airways, Inc. | ICAO: WOA, Callsign: World Airways, IATA Prefix: 468, Founded on 29 March 1948. | USA | AVCODES |
| 3 | WO | Swoop, Inc | ICAO: WSW, Callsign: Swoop, IATA Prefix: 995, Ulta LCC subsidary of WestJet. Planned startup 20 June 2018 with Y189 B737-800. | CDN | AVCODES |
| 4 | WOA | World Airways, Inc. | IATA: WO, Callsign: World, IATA Prefix: 468, Founded on 29 March 1948. Ceased operations on 27 March 2014. Designator WO reinstated by IATA | USA | AVCODES |
| 5 | WOA | World Airways, Inc. | IATA: WO, Callsign: World Airways, IATA Prefix: 468, Founded on 29 March 1948. | USA | AVCODES |
| 6 | WOA | World Airways | IATA: WO | | ICAO1 |
| 7 | WOAA | WANKLYN OIL CO INC | | | SCAC4 |
| 8 | WOAI | WEST OAHU AGGREGATE CO INC | | | SCAC4 |
| 9 | WOAK | WHITE OAK LOGISTICS INC | | | SCAC4 |
| 10 | WOAL | WOODLAND TRANSFER | | | SCAC4 |
| 11 | WOAX | Gulf States Corp. | 7/1930-7/1932 | | NAKINA |
| 12 | WOAX | GULF STATES CORP. | | | PWRC |
| 13 | WOB | Burlington Northern Inc. | added 10/1975; eliminated 1/1978; 1/1980 | | NAKINA |
| 14 | WOB | Burlington Northern Inc. | eliminated 1/78; 1/80 | | NRHS |
| 15 | WOB | BURLINGTON NORTHERN INC | | | PWRC |
| 16 | WOBD | WOLDING, H O INC | | | SCAC4 |
| 17 | WOBT | WRIGHT OIL INC | | | SCAC4 |
| 18 | WOBX | Western Oil & Burner Co. | 1/1945 | | NAKINA |
| 19 | WOBX | Western Oil Burner Co. | 1/1946 | | NAKINA |
| 20 | WOBX | Western Oil & Burner Co. | 4/1947 | | NAKINA |
| 21 | WOBX | Western Fruit Express Co. | 1/1952-1/1975; eliminated 1/1979 | | NAKINA |
| 22 | WOBX | Western Fruit Express Co. | 1/52-1/75; eliminated 1/79 | | NRHS |
| 23 | WOBX | *WESTERN OIL & BURNER CO. | | | PWRC |
| 24 | WOBX | *BURLINGTON NORTHERN RAILROAD CO [WESTERN FRUIT EXPRESS CO.] | | | PWRC |
| 25 | WOCA | WORCESTER COUNTY AIR FREIGHT, INC | | | SCAC1 |
| 26 | WOCA | WORCESTER COUNTY AIR FREIGHT INC | | | SCAC4 |
| 27 | WOCG | WELCH OIL CO LLC | | | SCAC4 |
| 28 | WOCH | WESSELS OIL COMPANY INC | | | SCAC4 |
| 29 | WOCJ | WHITEHEAD OIL COMPANY | | | SCAC4 |
| 30 | WOCK | WOODBURY TRANSPORT LLC | | | SCAC4 |
| 31 | WOCL | WOOLDRIDGE OIL COMP INC | | | SCAC4 |
| 32 | WOCN | WALLACE OIL COMPANY INC | | | SCAC4 |
| 33 | WOCO | WONDER TRANSPORT COMPANY | | | SCAC4 |
| 34 | WOCP | WHEATLAND OIL COMPANY INC | | | SCAC4 |
| 35 | WOCQ | WEBB OIL COMPANY | | | SCAC4 |
| 36 | WOCR | WEST OIL COMPANY INC | | | SCAC4 |
| 37 | WOCS | WOODSHED, THE | | | SCAC4 |
| 38 | WOCT | WARNER OIL COMPANY INC | | | SCAC4 |
| 39 | WOCV | WOC TRUCKING LLC | | | SCAC4 |
| 40 | WOCX | Wadhams Oil Co. | 7/1935-4/1938 | | NAKINA |
| 41 | WOCX | Socony-Vacuum Oil Co., Inc., Chicago Division | 1/1941-4/1947 | | NAKINA |
| 42 | WOCX | Wadhams Oil Co. | Apr-38 | | NRHS |
| 43 | WOCX | SOCONY-VACUUM OIL CO. [WADHAMS OIL CO.] | | | PWRC |
| 44 | WOCX | Wadhams Oil Co. | | USA | TRAFFIC |
| 45 | WOD | Woodgate Air Services | Callsign: Woodair, | GB | AVCODES |
| 46 | WOD | WASHINGTON & OLD DOMINION RAILROAD | | | PWRC |
| 47 | WOD | Washington and Old Dominion Railroad | | | RSRV |
| 48 | WOD | Washington and Old Dominion Railroad | | USA | TRAFFIC |
| 49 | WODC | W & O DISTRIBUTION CO INC | | | SCAC4 |
| 50 | WODD | WOLDING, H O INC | | | SCAC4 |
| 51 | WODH | WOODSTAR SHIPPING LLC | | | SCAC4 |
| 52 | WODI | WOODYS LLC | | | SCAC4 |
| 53 | WODK | WODEK SYSTEMS INC | | | SCAC4 |
| 54 | WODL | WOLVERTON DRAY LINE | | | SCAC4 |
| 55 | WODS | WOODSIDE TRANSPORTATION INC | | | SCAC4 |
| 56 | WODX | Woburn Degreasing Co. | 7/1930-7/1932 | | NAKINA |
| 57 | WODX | WOBURN DEGREASUNG CO. | | | PWRC |
| 58 | WODZ | WOODENVILLE DAIRY | | | PWRC |
| 59 | WOEC | WALCO ELECTRIC CO | | | SCAC4 |
| 60 | WOEP | WHEELS ON EXPRESS INC | | | SCAC4 |
| 61 | WOER | WOERPEL TRUCKING INC | | | SCAC4 |
| 62 | WOET | WINGS OF EALES TRANSPORT INC | | | SCAC4 |
| 63 | WOF | FFA Aviation (Pty) Ltd t/a Working on Fire | Callsign: Firewise, | ZA | AVCODES |
| 64 | WOFA | WINDING OAKS FARM | | | SCAC4 |
| 65 | WOFC | WOLFCREEK INC | | | SCAC4 |
| 66 | WOFL | WISE OIL & FUEL INC | | | SCAC4 |
| 67 | WOFR | WOLFE TRUCKING, INC | | | SCAC1 |
| 68 | WOFR | WOLFE TRUCKING INC | | | SCAC4 |
| 69 | WOFT | W O F TRUCKING LLC | | | SCAC4 |
| 70 | WOHO | Wabash & Ohio R.R. | added 1/1995; eliminated 4/1995; 7/2000-7/2005 | | NAKINA |
| 71 | WOHO | Wabash & Ohio R.R. | added 1/95; eliminated 4/95; 7/2000 | | NRHS |
| 72 | WOHO | WABASH & OHIO RAILROAD | | | PWRC |
| 73 | WOHO | Wabash and Ohio Railroad | | | RSRV |
| 74 | WOID | WAYMAN OIL DISTRIBUTORS INC | | | SCAC4 |
| 75 | WOIM | WATSON OIL COMPANY INC | | | SCAC4 |
| 76 | WOIN | WALSMA OIL INC | | | SCAC4 |
| 77 | WOIP | W O I PETROLEUM INC | | | SCAC4 |
| 78 | WOIQ | WOLF ORGANIZATION INC, THE | | | SCAC4 |
| 79 | WOIT | WOITALLA SERVICE INC | | | SCAC4 |
| 80 | WOIV | WESTERN OIL INC ENVIRONMENTAL SERVI | | | SCAC4 |
| 81 | WOK | Kovar Air | Callsign: Wokair, | CZ | AVCODES |
| 82 | WOK | Kovar Air | | | ICAO1 |
| 83 | WOKF | WHITE OAK FARMS | | | SCAC4 |
| 84 | WOKL | WEST OAKLAND LOGISTICS | | | SCAC4 |
| 85 | WOKO | WOKO TRANSPORTATION SERVICES INC | | | SCAC4 |
| 86 | WOKS | WINGS OVER KISSISSING | | | SCAC4 |
| 87 | WOKT | WHITE OAK TRANSPORT LIMITED | | | SCAC4 |
| 88 | WOKX | Western Oil Corp. of Texas | 7/1932; 7/1937 (not listed) | | NAKINA |
| 89 | WOKX | WESTERN OIL CORP. OF TEXAS | | | PWRC |
| 90 | WOL | Wings Aviation Limited t/a Air guyana | IATA: WA, Callsign: Wingjet, | GUY | AVCODES |
| 91 | WOL | Wings Aviation | | | ICAO1 |
| 92 | WOLC | WESTLAKE ONE LLC | | | SCAC4 |
| 93 | WOLD | WOLD, SIG STORAGE AND TRANSFER | | | SCAC4 |
| 94 | WOLF | WOLFE MOTOR LINES INC | | | SCAC4 |
| 95 | WOLF | Peter Wolf & Söhne | City: Chur | CH | TRAFFIC |
| 96 | WOLFS | Wolf's Bus | | USA | TRAFFIC |
| 97 | WOLH | WOLDING, H O INC | | | SCAC4 |
| 98 | WOLI | WOOLSEY INC | | | SCAC4 |
| 99 | WOLJ | WOMAN OWNED LOGISTICS INC | | | SCAC4 |
| 100 | WOLK | WOLFE, K D TRUCKING | | | SCAC4 |
