| 1 | WLC | Welcome Air Luftfahert GmbH & Co. KG | IATA: 2W, Callsign: Welcomeair, Founded in May 2000. Ceased operations on 26 December 2017. | A | AVCODES |
| 2 | WLC | Welcome Air | IATA: 2W | | ICAO1 |
| 3 | WLC | Wiener Lokalbahnen Cargo | | A | TRAFFIC |
| 4 | WLC | Wiener Lokalbahnen Cargo GmbH | | AT | VKM |
| 5 | WLCC | WELLS CONTRACT CARRIERS INC | | | SCAC4 |
| 6 | WLCD | WILCO DELIVERY SERVICES INCORPORATE | | | SCAC4 |
| 7 | WLCE | WALLACE TRANSPORTATION INC | | | SCAC4 |
| 8 | WLCF | WILCO FARMERS INC | | | SCAC4 |
| 9 | WLCH | H P WELCH CO | | | PWRC |
| 10 | WLCH | WELCH, DONALD E | | | SCAC4 |
| 11 | WLCK | WALECKA, A & SON INC | | | SCAC4 |
| 12 | WLCL | WORLD LINK CARRIER LLC | | | SCAC4 |
| 13 | WLCO | WALETICH CORPORATION | | | SCAC4 |
| 14 | WLCQ | WILSON, C H TRANSPORT INC | | | SCAC4 |
| 15 | WLCU | DEUTSCHE AFRIKA LINIEN GMBH & CO. | | | SCAC4 |
| 16 | WLCW | WLR CO | | | SCAC4 |
| 17 | WLCX | Warren Lubricant Co., Inc. | 7/1930-7/1932 | | NAKINA |
| 18 | WLCX | WARREN LUBRICANT CO., INC. | | | PWRC |
| 19 | WLCY | WAGES LAND & CATTLE CO INC | | | SCAC4 |
| 20 | WLCZ | WEBSTER LUMBER CO. | | | PWRC |
