| 1001 | WCUK | W C TRUCKING INC | | | SCAC4 |
| 1002 | WCUN | WHEEL COVERS UNLIMITED | | | SCAC4 |
| 1003 | WCVN | WC VISION LLC | | | SCAC4 |
| 1004 | WCVT | WISECARVER TRUCKING LLC | | | SCAC4 |
| 1005 | WCVX | FIREFIGHTERS EDUCATION AND TRAINING FOUNDATION "SAFETY TRAIN" | | | PWRC |
| 1006 | WCW | West Caribbean Airways, S.A. | IATA: YH, Designator YH reinstated by IATA | CO | AVCODES |
| 1007 | WCW | West Caribbean Airways | IATA: YH | | ICAO1 |
| 1008 | WCWA | WOLF CREEK WHITETAILS | | | SCAC4 |
| 1009 | WCWI | WEST COAST WIRE ROPE & RIGGING INC | | | SCAC4 |
| 1010 | WCWN | WHITE, C W INC | | | SCAC4 |
| 1011 | WCWW | WEST COAST WINDOWS | | | SCAC4 |
| 1012 | WCWY | WCW TRUCKING | | | SCAC4 |
| 1013 | WCX | Warner Chemical Co. | 7/1930-7/1935 | | NAKINA |
| 1014 | WCX | Wyandotte Chemicals Corp. | 1/1946 (not listed); 4/1947-1/1950; 1/1952 (not listed) | | NAKINA |
| 1015 | WCX | Western Chemicals Ltd. | added 10/1954; 10/1957; eliminated 1/1960 | | NAKINA |
| 1016 | WCX | Wyandotte Chemicals Corp. | Jan-52 | | NRHS |
| 1017 | WCX | Western Chemicals Ltd. | 10/57; eliminated 1/60 | | NRHS |
| 1018 | WCX | WESTERN CHEMICALS LTD. [WYANDOTTE CHEMICALS CORP.; WARNER CHEMICAL CO.] | | | PWRC |
| 1019 | WCXC | WC TRANSPORT SERVICES INC | | | SCAC4 |
| 1020 | WCXE | WEST COAST INDUSTRIAL EXPRESS | | | SCAC4 |
| 1021 | WCXI | W C TRANSPORT INC | | | SCAC4 |
| 1022 | WCXN | WALLACE TRANSPORTATION | | | SCAC4 |
| 1023 | WCXO | WILCOX OIL CO INC | | | SCAC4 |
| 1024 | WCXR | WEST COAST EXPRESS | | | SCAC4 |
| 1025 | WCXS | WEST COAST XPRESS | | | SCAC4 |
| 1026 | WCXU | WEC LINES BV | | NL | BIC |
| 1027 | WCXU | WEC LINES | | | SCAC4 |
| 1028 | WCXX | West Coast Railway Museum | 7/2005 (not listed) | | NAKINA |
| 1029 | WCXX | WEST COAST RAILWAY ASSOCIATION (WEST COAST RAILWAY MUSEUM) | | | PWRC |
| 1030 | WCXX | WEST COAST RAILWAY ASSOCIATION | | | SCAC4 |
| 1031 | WCY | Viking Express, Inc. | Callsign: Titan Air, | USA | AVCODES |
| 1032 | WCY | Viking Express | | | ICAO1 |
| 1033 | WCZ | WEYCO CO. | | | PWRC |
| 1034 | WD | WDL Aviation GmbH & Co. KG | ICAO: WDL, Callsign: WDL, Designator WD recalled by IATA. | D | AVCODES |
| 1035 | WD | Wardair Canada Ltd. | ICAO: WDA, Callsign: Wardair, Merged into Canadian Airlines 15 January 1990. | CDN | AVCODES |
| 1036 | WD | DAS Air Limited | ICAO: DAZ, Callsign: Dasair, IATA Prefix: 761, Name changed to Dairo Air Service Ltd. IATA code changed from SE* | EAK | AVCODES |
| 1037 | WD | Dairo air Service Ltd. | ICAO: DSR, Callsign: Dasair, IATA Prefix: 761, Name changed from DAS Air Limited. IATA code changed from SE* | EAK | AVCODES |
| 1038 | WD | Amsterdam Airlines BV | ICAO: AAN, Callsign: Amstel, Founded in 2007. Ceased operations on 31 October 2011. | NL | AVCODES |
| 1039 | WD | Wat Phnom Airlines | ICAO: WPH, Callsign: Wat Phnom, IATA Prefix: 913, Ceased operations during 2014. | K | AVCODES |
| 1040 | WD | Modern Transporte Aereo De Carga S.A. d/b/a Modern Logistics | ICAO: MWM, Callsign: Modernair, IATA Prefix: 372, | BR | AVCODES |
| 1041 | WD | LLC Aviation Company Eleron | ICAO: VVA, Callsign: Load Shark, IATA Prefix: 352, | UA | AVCODES |
| 1042 | WD | Kleinbahn Wedenau - Deutz | | D | TRAFFIC |
| 1043 | WDA | Wardair Canada Ltd. | IATA: WD, Callsign: Wardair, Merged into Canadian Airlines 15 January 1990. | CDN | AVCODES |
| 1044 | WDA | Wimbi Dira Airways | IATA: 9C, Callsign: Wimbidira, Designator 9C* recalled by IATA. Accounting code 357 recalled by IATA. Founded in 2003. Operations commenced on 13 August 2003. | ZRE | AVCODES |
| 1045 | WDA | Adam Aircraft Services GmbH | Callsign: Adam, | RSM | AVCODES |
| 1046 | WDA | Wimbi Dira Airways | | | ICAO1 |
| 1047 | WDAE | WOODALL ENTERPRISES INC | | | SCAC4 |
| 1048 | WDAI | WAYNES DELIVERY | | | SCAC4 |
| 1049 | WDAS | WALTS DRIVE-A-WAY SERVICE INC | | | SCAC4 |
| 1050 | WDAX | Washington Dept. of Agriculture | 1/1994-7/2005 (not listed) | | NAKINA |
| 1051 | WDAX | Washington Dept. of Agriculture | Jul-00 | | NRHS |
| 1052 | WDAX | Washington Dept. of Agriculture | Jan-94 | | NRHS |
| 1053 | WDAX | WASHINGTON DEPARTMENT OF AGRICULTURE | | | PWRC |
| 1054 | WDAX | Washington Department of Agriculture | | | RSRV |
| 1055 | WDAX | WASHINGTON DEPARTMENT OF AGRICULTUR | | | SCAC4 |
| 1056 | WDBC | WOODBURY TRANSPORTATION INC | | | SCAC4 |
| 1057 | WDBI | WDS BROKERAGE INC | | | SCAC4 |
| 1058 | WDBP | WIDDICOMB TRANSPORT INC | | | SCAC4 |
| 1059 | WDBT | WOODARD DISTRIBUTING LLC | | | SCAC4 |
| 1060 | WDC | Washington Metropolitan Area Transit Authority | City: Washington DC | US-DC | TRAFFIC |
| 1061 | WDCC | WEBSTER, DON COMPANY INC, THE | | | SCAC4 |
| 1062 | WDCH | WOOD, CHAS & SON MOVING INC | | | SCAC4 |
| 1063 | WDCM | WOOD FARMS | | | SCAC4 |
| 1064 | WDCN | WARD DISTRIBUTING COMPANY INC | | | SCAC4 |
| 1065 | WDCP | WAYNE-DALTON CORP | | | SCAC4 |
| 1066 | WDCQ | WORLDWIDE CONTAINER TRANSPORT INC | | | SCAC4 |
| 1067 | WDCX | Wm. Davies Co., Inc. | 8/1920-7/1932 | | NAKINA |
| 1068 | WDCX | Wm. Davies Co., Inc. (Canada Packers Ltd.) | 7/1935 | | NAKINA |
| 1069 | WDCX | Warren-Douglas Chemical Co., Inc. | added 10/1964; 7/1965-4/1970; eliminated 11/1973 | | NAKINA |
| 1070 | WDCX | Warren-Douglas Chemical Co., Inc. | Apr-70 | | NRHS |
| 1071 | WDCX | Warren-Douglas Chemical Co., Inc. | 7/65-10/66; eliminated 11/73 | | NRHS |
| 1072 | WDCX | *WM. DAVIES CO., INC. | | | PWRC |
| 1073 | WDCX | *WARREN-DOUGLAS CHEMICAL CO., INC. | | | PWRC |
| 1074 | WDCY | WORLDWIDE DELIVERY CORP | | | SCAC4 |
| 1075 | WDDA | WOOD, DAVID TRUCKING | | | SCAC4 |
| 1076 | WDDB | WESTERN DISPATCH & DISTRIBUTION | | | SCAC4 |
| 1077 | WDDL | WADDELL TRANSFER INC | | | SCAC4 |
| 1078 | WDDN | WADDEN TRANSPORTATION INC | | | SCAC4 |
| 1079 | WDDT | WELDED TUBE OF CANADA | | | SCAC4 |
| 1080 | WDE | Pallas Aviation, LLC | Callsign: Sandstone, | USA | AVCODES |
| 1081 | WDEA | WADE TRANSPORTATION COMPANY INC | | | SCAC4 |
| 1082 | WDEG | WRIGLEY DESIGNS | | | SCAC4 |
| 1083 | WDEP | WINDERMERE PROPERTIES LLC | | | SCAC4 |
| 1084 | WDFC | W D F INC | | | SCAC4 |
| 1085 | WDFE | WOODFIELD INC | | | SCAC4 |
| 1086 | WDFG | WOODSON FREIGHT | | | SCAC4 |
| 1087 | WDFN | WOODFIN OIL CO | | | SCAC4 |
| 1088 | WDFO | WE DO FOR YOU | | | SCAC4 |
| 1089 | WDFR | WIND AFRAMAX TANKER CORPORATION | | | SCAC4 |
| 1090 | WDFU | ALLNEX AUSTRIA GMBH | | A | BIC |
| 1091 | WDG | Ministry Of Agriculture Fisheries And Food | Callsign: Watchdog, | GB | AVCODES |
| 1092 | WDG | Ministry of Agriculture, Fisheries and Food | | | ICAO1 |
| 1093 | WDGP | WIDE DISTRIBUTION GROUP INC | | | SCAC4 |
| 1094 | WDHC | WAMBOLD, HOWARD C | | | SCAC4 |
| 1095 | WDHG | WINDISH TRUCKING INC | | | SCAC4 |
| 1096 | WDHT | WDH TRUCKING INC | | | SCAC4 |
| 1097 | WDHU | TSIDEHAAN GMBH | | D | BIC |
| 1098 | WDIN | WEST, DEAN, TRUCKING, INC | | | SCAC1 |
| 1099 | WDIN | WEST, DEAN TRUCKING INC | | | SCAC4 |
| 1100 | WDIU | WHEELS DEDICATED INC | | | SCAC4 |
