| 1 | WIL | West Isle Air, Inc. | IATA: W6, Callsign: West-Isle Air, Ceased operations. | USA | AVCODES |
| 2 | WIL | Aero Air | | | ICAO1 |
| 3 | WILBUS | Wilbus | City: Wilmette | USA | TRAFFIC |
| 4 | WILC | WILCOX BODIES LIMITED | | | SCAC4 |
| 5 | WILD | WILLIAMSON DISTRIBUTORS INC | | | SCAC4 |
| 6 | WILGA | Stowarzyszenie Przewoźników Drogowych Powiatu Otwockiego "Wilga Bus" | City: Warszawa | PL | TRAFFIC |
| 7 | WILH | WILHELM TRUCKING CO | | | SCAC4 |
| 8 | WILJ | WHITACRE INTERMODAL LLC | | | SCAC4 |
| 9 | WILK | WILKINS, BARRY L | | | SCAC4 |
| 10 | WILLETTS | Willetts Tours | | USA | TRAFFIC |
| 11 | WILLIAMS | Circus Williams | | FAN | TRAFFIC |
| 12 | WILLOW | Willow Bus | | USA | TRAFFIC |
| 13 | WILM | WILLIAMS, J MYRON INC | | | SCAC4 |
| 14 | WILM | Wilmobil AG | | CH | TRAFFIC |
| 15 | WILP | WA II L P | | | SCAC4 |
| 16 | WILQ | WILLS TRUCKING | | | SCAC4 |
| 17 | WILR | WILLIAMS, RICHARD T & SON | | | SCAC4 |
| 18 | WILU | ONE WAY LEASE INC | | | SCAC4 |
| 19 | WILW | WILLOW RIDGE FARM | | | SCAC4 |
| 20 | WILX | Wilshire Oil Co., Inc. | 1/1945-1/1946 | | NAKINA |
| 21 | WILX | Wilford and Sands | added 7/1961; eliminated 7/1962 | | NAKINA |
| 22 | WILX | Wilmeth Petroleum Co. | added 7/1962; eliminated 1/1965 | | NAKINA |
| 23 | WILX | Wilmeth Petroleum Co. | eliminated 1/65 | | NRHS |
| 24 | WILX | *WILSHIRE OIL CO., INC. | | | PWRC |
| 25 | WILX | *WILFORD & SANDS | | | PWRC |
| 26 | WILX | *WILMETH PETROLEUM CO. | | | PWRC |
| 27 | WILY | WILLARD OIL COMPANY INC | | | SCAC4 |
| 28 | WILZ | WILLIAMETTE INDUSTRIES | | | PWRC |
