| 1 | WI | Rottnest Airlines | | AUS | AVCODES |
| 2 | WI | Tradewinds Airlines, Inc. | ICAO: TDX, Callsign: Tradewinds Express, Designator WI* recalled by IATA. IATA designator WI* reinstated | USA | AVCODES |
| 3 | WI | Wilken Air Services Ltd. | Callsign: Wilken, | EAK | AVCODES |
| 4 | WI | White Airways S.A. | ICAO: WHT, Callsign: Whitejet, Accounting Code reinstated by IATA. Name change from YES - Linhas Aereas Charter, S.A. - Yestours. ICAO designator changed from YSS | P | AVCODES |
| 5 | WI | WATCO SWITCH INDIANA (CODE PREVIOUSLY ASSIGNED TO WOODWARD INC.) | | | PWRC |
| 6 | WI | Wieslauftalbahn | | D | TRAFFIC |
| 7 | WIA | Windward Islands Airways International N.V. | IATA: WM, Callsign: Windward, IATA Prefix: 295, | NA | AVCODES |
| 8 | WIA | Windward Islands Airways International | | | ICAO1 |
| 9 | WIAC | WILGRO INC | | | SCAC4 |
| 10 | WIAG | WINDSOR FEEDSCREWS INC | | | SCAC4 |
| 11 | WIAK | WISEHART INVESTMENTS | | | SCAC4 |
| 12 | WIAL | WILLYS FANCY FISH LTD | | | SCAC4 |
| 13 | WIAO | WILKINSON CONSTRUCTION CO INC | | | SCAC4 |
| 14 | WIBA | WILMINGTON BOAT MOVERS & STORAGE | | | SCAC1 |
| 15 | WIBA | WILMINGTON BOATMOVERS INC | | | SCAC4 |
| 16 | WIBG | WILL TRANS | | | SCAC4 |
| 17 | WIBK | WILLIAMS BROS TRUCKING LLC | | | SCAC4 |
| 18 | WIBZ | WILBERT, INC. | | | PWRC |
| 19 | WICB | WESTERN IOWA COOPERATIVE | | | SCAC4 |
| 20 | WICC | WILCOX TRUCKING LLC | | | SCAC4 |
| 21 | WICH | WICHITA MOVING & STORAGE | | | SCAC4 |
| 22 | WICHITA | Wichita Transit | City: Wichita KS | USA | TRAFFIC |
| 23 | WICO | William Cook Rail GmbH | | CH | VKM |
| 24 | WICP | WORLDWIDE INVESTMENT CORP | | | SCAC4 |
| 25 | WICQ | W I CONSTRUCTION INC | | | SCAC4 |
| 26 | WICS | WEIRTON ICE & COAL SUPPLY COMPANY | | | SCAC4 |
| 27 | WICT | Wisconsin & Calumet R.R. Co., Inc. | added 10/1985; 1/1994; eliminated 4/1995 | | NAKINA |
| 28 | WICT | Wisconsin & Southern R.R. Co., Inc. | added 4/1995 | | NAKINA |
| 29 | WICT | Wisconsin & Calumet R.R. Co., Inc. | eliminated 1/1998 | | NAKINA |
| 30 | WICT | Wisconsin & Calumet R.R. Co., Inc. | 1/94; eliminated 4/95 | | NRHS |
| 31 | WICT | Wisconsin & Southern R.R. Co., Inc. | added 4/95 | | NRHS |
| 32 | WICT | Wisconsin & Calumet R.R. Co., Inc. | eliminated 1/98 | | NRHS |
| 33 | WICT | WISCONSIN & SOUTHERN RAILROAD CO. [WISCONSIN AND CALUMET RAILROAD CO.] | | | PWRC |
| 34 | WICT | Wisconsin and Calumet Railroad | | | RSRV |
| 35 | WICU | WICAB CONTAINER AB | | S | BIC |
| 36 | WICU | HEINRICH WIECHERS SEN KG | | | SCAC4 |
| 37 | WICW | WICHITA SOUTH AND WEST | | | SCAC4 |
| 38 | WID | Wind Airline, Joint-Stock Company | Callsign: Windaero, | RUS | AVCODES |
| 39 | WID | Widgeon Airline | Callsign: Widgeon, | BY | AVCODES |
| 40 | WIDE | Widerøes Flyveselskap AS, | Real: WF / WIF | N | TRAFFIC |
| 41 | WIDG | WINDER TRUCKING LLC | | | SCAC4 |
| 42 | WIDL | WORLDWIDE TRANSPORTATION LOGISTICS | | | SCAC4 |
| 43 | WIDN | WIND RIVER TRUCKING | | | SCAC4 |
| 44 | WIDQ | WINDFALL INC | | | SCAC4 |
| 45 | WIDR | WIDER LOGISTICS LIMITED | | | SCAC4 |
| 46 | WIDU | WICKS B V | | | SCAC4 |
| 47 | WIEB | WIEBERG, RICKIE LLC | | | SCAC4 |
| 48 | WIEBE | | | D | TRAFFIC |
| 49 | WIEC | WEL COMPANIES INC (TL) | | | SCAC4 |
| 50 | WIEL | WEL COMPANIES INC | | | SCAC4 |
| 51 | WIEN | Wiener Linien | City: Wien | A | TRAFFIC |
| 52 | WIES | WILDERNEST LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 53 | WIEX | Wilbur-Ellis Co. | eliminated 10/1995 | | NAKINA |
| 54 | WIEX | Wilbur-Ellis Co. | eliminated 10/95 | | NRHS |
| 55 | WIEX | WILBUR-ELLIS CO. | | | PWRC |
| 56 | WIF | Wideroe's Flyveselskap A/S | IATA: WF, Callsign: Wideroe, IATA Prefix: 701, | N | AVCODES |
| 57 | WIF | Wider?e | IATA: WF | | ICAO1 |
| 58 | WIF | West India Fruit & Steam Ship Co. | 1/1950-4/1961 | | NAKINA |
| 59 | WIF | Atlantic Coast Line R.R. | 7/1965-4/1970 | | NAKINA |
| 60 | WIF | West India Fruit & Steamship | 1/1975-7/2005 | | NAKINA |
| 61 | WIF | West India Fruit & Steam Ship Co. | 1/52-4/61 | | NRHS |
| 62 | WIF | Atlantic Coast Line R.R. | 7/65-4/70 | | NRHS |
| 63 | WIF | West India Fruit & Steamship | 1/75-7/2000 | | NRHS |
| 64 | WIF | *ATLANTIC COAST LINE RAILROAD | | | PWRC |
| 65 | WIF | +WEST INDIA FRUIT & STEAMSHIP CO. | | | PWRC |
| 66 | WIF | West India Fruit and Steamship | | | RSRV |
| 67 | WIF | WEST INDIA FRUIT & | | | SCAC4 |
| 68 | WIF | West India Fruit & Steamship Co. | | USA | TRAFFIC |
| 69 | WIFB | WEST ISLES TRANSPORT LTD | | | SCAC4 |
| 70 | WIFD | WORLD INTERNATIONAL FORWARDING CO | | | SCAC4 |
| 71 | WIFF | WHEELS INTERNATIONAL FRIEGHT SYSTEM | | | SCAC4 |
| 72 | WIFG | WILE TRANSFER & STORAGE CO INC | | | SCAC4 |
| 73 | WIFH | WHEELS INTERNATIONAL FREIGHT SYSTEM | | | SCAC4 |
| 74 | WIFL | WHEELS INTERNATIONAL FREIGHT SYSTEM | | | SCAC4 |
| 75 | WIFO | WISE FOODS INC | | | SCAC4 |
| 76 | WIFS | WHEELS INTERNATIONAL FREIGHT SYSTEM | | | SCAC4 |
| 77 | WIFW | WESTAR INTERNATIONAL FORWARDERS LP | | | SCAC4 |
| 78 | WIG | Wiggins Airways | Callsign: Wiggins Airways, | USA | AVCODES |
| 79 | WIG | Wiggins Airways | | | ICAO1 |
| 80 | WIGC | WIGGERS CUSTOM FURNITURE LTD | | | SCAC4 |
| 81 | WIGE | WINTERGREEN TRANSPORT CORP | | | SCAC1 |
| 82 | WIGE | WINTERGREEN TRANSPORT CORP LTD | | | SCAC4 |
| 83 | WIGG | WIGGINS, H C INC | | | SCAC4 |
| 84 | WIGO | WIGGINTON OIL CO | | | SCAC4 |
| 85 | WIGS | WESTERN INTERNATIONAL GAS & CYLINDE | | | SCAC4 |
| 86 | WIGX | Wigeon Car Co. | added 1/1968; 4/1970-1/1980; eliminated 4/1992 | | NAKINA |
| 87 | WIGX | Western International Gas & Cylinders, Inc. | 7/2005 (not listed) | | NAKINA |
| 88 | WIGX | Wigeon Car Co. | added 1/68; 4/70-1/80; eliminated 4/92 | | NRHS |
| 89 | WIGX | *RETIRED 08-22-92 ATP (1674) [WIGEON CAR CO.] | | | PWRC |
| 90 | WIGX | +WESTERN INTERNATIONAL GAS & CYLINDERS, INC. | | | PWRC |
| 91 | WIGX | Wigeon Car | | | RSRV |
| 92 | WIGX | WESTERN INTERNATIONAL GAS & CYLINDE | | | SCAC4 |
| 93 | WIHD | WHITE, HAROLD LUMBER INC | | | SCAC4 |
| 94 | WIHL | WISHALL TRANSPORT | | | SCAC4 |
| 95 | WIHS | WHITEHOUSE INC | | | SCAC4 |
| 96 | WIIA | WESCO INTERNATIONAL INC | | | SCAC4 |
| 97 | WIIG | W & I LEASING | | | SCAC4 |
| 98 | WIIL | WILLIAMS, SHAUN TRUCKING | | | SCAC4 |
| 99 | WIIN | WAYCON INNOVATION INC | | | SCAC4 |
| 100 | WIIP | WILLPAK INDUSTRIES INC | | | SCAC4 |
