| 1 | WL | Aerolíneas Islas de Las Perlas | ICAO: APP, Callsign: Aeroperlas, IATA Prefix: 054, Ceased operations on 29 February 2012. TACA Regional Airline | PA | AVCODES |
| 2 | WL | Lao Air Lines | | LAO | AVCODES |
| 3 | WL | Compagne Aerienne Du Languedoc | ICAO: LGW, | F | AVCODES |
| 4 | WL | European Coastal Airlines Ltd. | ICAO: ECB, Callsign: Coastal Clipper, Ceased operations October 2016. IATA designator changed from H5 | HR | AVCODES |
| 5 | WL | Caribbean Sun Airlines, Inc. d/b/a World Atlantic Airlines | ICAO: WAL, Callsign: World Atlantic, IATA Prefix: 527, Designator K8* recalled by IATA. Name changed from Caribbean Sun Airlines, Inc | USA | AVCODES |
| 6 | WL | WIENER LINIEN GmbH & Co KG | | AT | VKM |
| 7 | WLA | West London Aero Servies Ltd. | Callsign: West London, | GB | AVCODES |
| 8 | WLA | Airwaver Airlink Limited | Callsign: Airlimited, | Z | AVCODES |
| 9 | WLA | Airwaves Airlink | | | ICAO1 |
| 10 | WLAA | WATKINS, L & ASSOCIATES INC | | | SCAC4 |
| 11 | WLAE | WINDWALKER LOGISTICS INC | | | SCAC4 |
| 12 | WLAF | WINK, LARRY LIME SERVICE LLC | | | SCAC4 |
| 13 | WLAL | WILLIAMS LOGISTICS LLC | | | SCAC4 |
| 14 | WLAS | WILLIAMS, MLJ LLC | | | SCAC4 |
| 15 | WLAW | WHITELAW TRUCKING INC | | | SCAC4 |
| 16 | WLAY | W L A INC | | | SCAC4 |
| 17 | WLB | Wings of Lebanon S.a.l. | IATA: L4, Designator L4 recalled by IATA | RL | AVCODES |
| 18 | WLB | Wings of Lebanon S.a.l. | IATA: W7, Temporarily suspended operation on 26 August 2020. Designator L4 recalled by IATA | RL | AVCODES |
| 19 | WLB | Wings of Lebanon Aviation | | | ICAO1 |
| 20 | WLB | WOLFS BUS LINES INC | | | SCAC4 |
| 21 | WLB | Lokalbahn Wien-Baden | City: Wien | A | TRAFFIC |
| 22 | WLB | Wiener Lokalbahnen AG | | AT | VKM |
| 23 | WLBA | WDI LOGISTICS AND BROKERAGE | | | SCAC4 |
| 24 | WLBF | WEST LINCOLN BARNBOARD & ANTIQUE FL | | | SCAC4 |
| 25 | WLBG | WILLIAMS, ALBERT TRUCKING INC | | | SCAC4 |
| 26 | WLBI | WELLNESS BELTS INC | | | SCAC4 |
| 27 | WLBK | WILLOWBROOK NURSERIES INC | | | SCAC4 |
| 28 | WLBL | WLB LIVESTOCK | | | SCAC4 |
| 29 | WLBN | WALBON LOGISTICS INC | | | SCAC4 |
| 30 | WLBQ | WILLIAMSBURG TRANSPORT, INC | | | SCAC1 |
| 31 | WLBY | WILLOUGHBY INC | | | SCAC4 |
| 32 | WLC | Welcome Air Luftfahert GmbH & Co. KG | IATA: 2W, Callsign: Welcomeair, Founded in May 2000. Ceased operations on 26 December 2017. | A | AVCODES |
| 33 | WLC | Welcome Air | IATA: 2W | | ICAO1 |
| 34 | WLC | Wiener Lokalbahnen Cargo | | A | TRAFFIC |
| 35 | WLC | Wiener Lokalbahnen Cargo GmbH | | AT | VKM |
| 36 | WLCC | WELLS CONTRACT CARRIERS INC | | | SCAC4 |
| 37 | WLCD | WILCO DELIVERY SERVICES INCORPORATE | | | SCAC4 |
| 38 | WLCE | WALLACE TRANSPORTATION INC | | | SCAC4 |
| 39 | WLCF | WILCO FARMERS INC | | | SCAC4 |
| 40 | WLCH | H P WELCH CO | | | PWRC |
| 41 | WLCH | WELCH, DONALD E | | | SCAC4 |
| 42 | WLCK | WALECKA, A & SON INC | | | SCAC4 |
| 43 | WLCL | WORLD LINK CARRIER LLC | | | SCAC4 |
| 44 | WLCO | WALETICH CORPORATION | | | SCAC4 |
| 45 | WLCQ | WILSON, C H TRANSPORT INC | | | SCAC4 |
| 46 | WLCU | DEUTSCHE AFRIKA LINIEN GMBH & CO. | | | SCAC4 |
| 47 | WLCW | WLR CO | | | SCAC4 |
| 48 | WLCX | Warren Lubricant Co., Inc. | 7/1930-7/1932 | | NAKINA |
| 49 | WLCX | WARREN LUBRICANT CO., INC. | | | PWRC |
| 50 | WLCY | WAGES LAND & CATTLE CO INC | | | SCAC4 |
| 51 | WLCZ | WEBSTER LUMBER CO. | | | PWRC |
| 52 | WLD | Wilderness Airline (1975) Ltd. | Callsign: Wilderness, | CDN | AVCODES |
| 53 | WLD | Wilderness Air South Africa (Pty) Ltd | Callsign: Wilderness, | ZA | AVCODES |
| 54 | WLDB | WELLS DAIRY INC (BROKERAGE DIV) | | | SCAC4 |
| 55 | WLDC | WESSCO INTERNATIONAL | | | SCAC4 |
| 56 | WLDD | WALL, DIEDRICH | | | SCAC4 |
| 57 | WLDE | WILSON DELIVERY SERVICE, INC | | | SCAC1 |
| 58 | WLDN | WELDON WOODWORK | | | SCAC4 |
| 59 | WLDQ | WELLS DAIRY INC | | | SCAC4 |
| 60 | WLDS | WORLD SHIP SUPPLY (TEXAS) INC | | | SCAC4 |
| 61 | WLDT | WILLIAMSON, EDWARD A TRUCKING | | | SCAC4 |
| 62 | WLDX | Weldship Corp. | 7/2000-7/2005 (not listed) | | NAKINA |
| 63 | WLDX | Weldship Corp. | Jul-00 | | NRHS |
| 64 | WLDX | WELDSHIP CORP. | | | PWRC |
| 65 | WLDX | Weldship Corporation | | | RSRV |
| 66 | WLDX | WELDSHIP CORPORATION | | | SCAC4 |
| 67 | WLE | Wheeling & Lake Erie Ry. | 4/1938-10/1957 | | NAKINA |
| 68 | WLE | Wheeling & Lake Erie Ry. (New York, Chicago and St. Louis R.R. Co.) | 4/1961-7/1965 | | NAKINA |
| 69 | WLE | Wheeling & Lake Erie Ry. (Norfolk and Western Ry.) | 4/1970 | | NAKINA |
| 70 | WLE | Wheeling & Lake Erie | 1/1975-1/1980 | | NAKINA |
| 71 | WLE | Wheeling & Lake Erie Ry. | 4/38-10/57 | | NRHS |
| 72 | WLE | Wheeling & Lake Erie Ry. (New York, Chicago and St. Louis R.R. Co.) | 4/61-7/65 | | NRHS |
| 73 | WLE | Wheeling & Lake Erie Ry. (Norfolk and Western Ry.) | Apr-70 | | NRHS |
| 74 | WLE | Wheeling & Lake Erie | 1/75-1/80 | | NRHS |
| 75 | WLE | Westfälische Landeseisenbahn GmbH | Lippstadt | D | privat-bahn.de |
| 76 | WLE | NORFOLK SOUTHERN RAILWAY COMPANY [NORFOLK & WESTERN RWY.; NEW YORK, CHICAGO & ST. LOUIS RAILROAD CO.; WHEELING & LAKE ERIE RWY. (1880-1949)] | | | PWRC |
| 77 | WLE | Wheeling and Lake Erie Railway | | | RSRV |
| 78 | WLE | Westfälische Landeseisenbahn GmbH | | D | TRAFFIC |
| 79 | WLE | Westfälische Landeseisenbahn | | DE | VKM |
| 80 | WLEA | WALTER LEASING LLC | | | SCAC4 |
| 81 | WLEE | WHITE, LEE M INC | | | SCAC4 |
| 82 | WLEH | WILLE TRANSPORT INC | | | SCAC4 |
| 83 | WLEL | WHITELINE EXPRESS, LTD | | | SCAC1 |
| 84 | WLEL | WHITELINE EXPRESS LTD | | | SCAC4 |
| 85 | WLEM | WILEY LOUISE EXPRESS LLC | | | SCAC4 |
| 86 | WLEN | WHALENS INC | | | SCAC4 |
| 87 | WLEQ | WHITE LIGHTENING EXPRESS INC | | | SCAC4 |
| 88 | WLER | Wheeling & Lake Erie Railway Company | Real: WE | USA | TRAFFIC |
| 89 | WLEV | WHITE LINE EXPRESS INC | | | SCAC4 |
| 90 | WLEY | WILEY, VIRGIL DISTRIBUTING | | | SCAC4 |
| 91 | WLF | Hubei Sky-Blue International Aviation Academy Co., Ltd | Callsign: Sky Blue, | PRC | AVCODES |
| 92 | WLFA | WILSON FARMS (1980) | | | SCAC4 |
| 93 | WLFB | Wolfeboro R.R. Co., Inc. | 1/1975-1/1980 | | NAKINA |
| 94 | WLFB | Wolfeboro R.R. Co., Inc. | 1/75-1/80 | | NRHS |
| 95 | WLFB | WOLFEBORO RAILROAD | | | PWRC |
| 96 | WLFB | Wolfeboro Railroad | | | RSRV |
| 97 | WLFE | WILLIAMS FUEL OIL CO LLC | | | SCAC4 |
| 98 | WLFG | WOLFES TRUCKING INC | | | SCAC4 |
| 99 | WLFM | WALLACE FARM LLC | | | SCAC4 |
| 100 | WLFP | WOLFE EXPRESS LLC | | | SCAC4 |
