| 2901 | WLSI | WLS TRUCKING | | | SCAC4 |
| 2902 | WLSJ | WILLIAMS, J K LLC | | | SCAC4 |
| 2903 | WLSM | WORLDTRANS LOGISTICS SERVICES LIMIT | | | SCAC4 |
| 2904 | WLSN | WILSON AGENCY B V | | | SCAC4 |
| 2905 | WLSO | WILSON OIL COMPANY INC | | | SCAC4 |
| 2906 | WLSP | WILSON PAVING | | | SCAC4 |
| 2907 | WLSQ | WILSON, J E & SON INC | | | SCAC4 |
| 2908 | WLSR | WILSON SERVICES INC | | | SCAC4 |
| 2909 | WLSU | WHITACRE LOGISTICS SERVICES, LLC | | USA | BIC |
| 2910 | WLSU | WLS DUBAI | | | SCAC4 |
| 2911 | WLSV | WAGNER LOGISTICS SERVICES | | | SCAC4 |
| 2912 | WLT | Aviation Partners, Inc. | Callsign: Winglet, | USA | AVCODES |
| 2913 | WLT | Aviation Partners | | | ICAO1 |
| 2914 | WLTB | WEST LIGHT TRANS INC | | | SCAC4 |
| 2915 | WLTC | West Texas and Lubbock Ry. Co. | added 7/2002 | | NAKINA |
| 2916 | WLTC | WEST TEXAS & LUBBOCK RWY. CO. | | | PWRC |
| 2917 | WLTE | WALRUS TRUCK & CRANE SERVICES LTD | | | SCAC4 |
| 2918 | WLTH | WHITE LINE TRUCKING | | | SCAC4 |
| 2919 | WLTK | WILSONS TRUCK LINES LTD | | | SCAC4 |
| 2920 | WLTN | WELLTEC CANADA | | | SCAC4 |
| 2921 | WLTO | WLIT INC | | | SCAC4 |
| 2922 | WLUB | WALLIS LUBRICANT LLC | | | SCAC4 |
| 2923 | WLUC | WORLD LOGISTICS US INC | | | SCAC4 |
| 2924 | WLV | Phelps Collins Aviation d/b/a Aviation North | Callsign: Wolverine, | USA | AVCODES |
| 2925 | WLV | Aviation North | | | ICAO1 |
| 2926 | WLVE | WE LOVE TO MOVE INC | | | SCAC4 |
| 2927 | WLVT | WALL LIVESTOCK & TRANSPORT | | | SCAC4 |
| 2928 | WLWA | WILLIWAW SERVICES INC | | | SCAC4 |
| 2929 | WLWC | WELLWOOD COLONY FARMS LTD | | | SCAC4 |
| 2930 | WLWD | WILDWOOD TRANSPORT INC | | | SCAC4 |
| 2931 | WLWH | WALLENIUS WILHELMSEN | | | SCAC1 |
| 2932 | WLWH | WALLENIUS WILHELMSEN LOGISTICS AMER | | | SCAC4 |
| 2933 | WLWO | W-L-W TRUCKING INC | | | SCAC4 |
| 2934 | WLX | West Air Luxembourg S.A. | Callsign: West Lux, | L | AVCODES |
| 2935 | WLX | West Air Luxembourg | | | ICAO1 |
| 2936 | WLX | Wilsil Ltd. | 7/1935-4/1938 | | NAKINA |
| 2937 | WLX | Wilsil Ltd. | Apr-38 | | NRHS |
| 2938 | WLX | WILSIL LTD. | | | PWRC |
| 2939 | WLXP | WHITE LION EXPRESS INC, THE | | | SCAC4 |
| 2940 | WLZN | WOLZEN, JOSEPH TRUCKING INC | | | SCAC4 |
| 2941 | WM | Windward Islands Airways International N.V. | ICAO: WIA, Callsign: Windward, IATA Prefix: 295, | NA | AVCODES |
| 2942 | WM | Western Maryland Ry. Co. | 8/1920-1/1980; eliminated 1/1984 | | NAKINA |
| 2943 | WM | Baltimore & Ohio R.R. Co. | added 1/1984; eliminated 7/1987 | | NAKINA |
| 2944 | WM | The Chesapeake and Ohio Ry. Co. | added 7/1987; eliminated 10/1987 | | NAKINA |
| 2945 | WM | CSX Transportation, Inc. | added 10/1987; 1/1994-7/2005 | | NAKINA |
| 2946 | WM | Western Maryland Ry. Co. | 4/38-1/80 | | NRHS |
| 2947 | WM | Baltimore & Ohio R.R. Co. | eliminated 7/87 | | NRHS |
| 2948 | WM | The Chesapeake and Ohio Ry. Co. | added 7/87; eliminated 10/87 | | NRHS |
| 2949 | WM | CSX Transportation, Inc. | added 10/87; 1/94-7/2000 | | NRHS |
| 2950 | WM | CSX TRANSPORTATION, INC. {CHESSIE SYSTEM; B&O; WESTERN MARYLAND RY] | | | PWRC |
| 2951 | WM | Western Maryland Railroad (CSX Transportation) | | | RSRV |
| 2952 | WM | WESTERN MARYLAND RAILWAY COMPANY (C | | | SCAC4 |
| 2953 | WM | BDWM Transport AG, Wohlen - Meisterschwanden | | CH | TRAFFIC |
| 2954 | WM | Wagonmarket, spol. s.r.o. | | SK | VKM |
| 2955 | WM&N | Weatherford, Mineral Wells & Northwestern Ry. Co. | 7/1923-4/1938 | | NAKINA |
| 2956 | WM&N | Weatherford, Mineral Wells & Northwestern Ry. Co. | Apr-38 | | NRHS |
| 2957 | WM&N | WEATHERFORD, MINERAL WELLS & NORTHWESTERN RWY. CO. | | | PWRC |
| 2958 | WMA | Watermakers Air | Callsign: Watermakers, | USA | AVCODES |
| 2959 | WMAA | WERNER, MIKE TRUCKING INC | | | SCAC4 |
| 2960 | WMAE | WARLAND, MARIANNE | | | SCAC4 |
| 2961 | WMAF | WEISMAN ART FOUNDRY | | | SCAC4 |
| 2962 | WMAG | WATER MAGIC | | | SCAC4 |
| 2963 | WMAI | WESTBY, MARK & ASSOCIATES INC | | | SCAC4 |
| 2964 | WMAJ | WESTERN MOUNTAIN TRANSPORT INC | | | SCAC4 |
| 2965 | WMaJ | Vittsjö - Markaryd Järnväg | 1892 - 1897 | S | svenska-lok.se |
| 2966 | WMAM | WILLIAM AMERICA | | | SCAC4 |
| 2967 | WMATA | Washington Metropolitan Area Transit Authority | | USA | TRAFFIC |
| 2968 | WMBC | WILMOT, BRUCE T | | | SCAC4 |
| 2969 | WMBT | WMB TRANSPORTATION | | | SCAC1 |
| 2970 | WMBT | WIDEMAN, B TRUCKING | | | SCAC4 |
| 2971 | WMBU | WHITE MARTINS GASES INDUSTRIAIS LTD | | | SCAC4 |
| 2972 | WMBX | Willbros Terminal Co. | added 10/1967; 4/1970; eliminated 7/1974 | | NAKINA |
| 2973 | WMBX | North American Car Corp. | 1/1975; added 4/1975; eliminated 7/1976 | | NAKINA |
| 2974 | WMBX | Willbros Terminal Co. | added 10/67; 4/70; eliminated 7/74 | | NRHS |
| 2975 | WMBX | North American Car Corp. | 1/75; added 4/75; eliminated 7/76 | | NRHS |
| 2976 | WMBX | (NATX) NATX (WILLBROS TERMINAL CO.) | | | PWRC |
| 2977 | WMCD | WEST MICHIGAN CONSOLIDATORS | | | SCAC4 |
| 2978 | WMCI | WEST MICHIGAN TRANSPORT LLC | | | SCAC4 |
| 2979 | WMCL | WHITELAW MACHINERY COMPANY LIMITED | | | SCAC4 |
| 2980 | WMCM | WIMCO METALS INC | | | SCAC4 |
| 2981 | WMCO | WINGHAM COLONY FARMS | | | SCAC4 |
| 2982 | WMCP | WILMAC ENTERPRISES LLC | | | SCAC4 |
| 2983 | WMCQ | WHITEWATER MARINE CORP | | | SCAC4 |
| 2984 | WMCR | WATKINS MANUFACTURING CORP | | | SCAC4 |
| 2985 | WMCS | WINDMILL CABINET SHOP LTD | | | SCAC4 |
| 2986 | WMCW | WOOIL MARINE CO LTD | | | SCAC4 |
| 2987 | WMCX | The Westinghouse Machine Co. | 8/1920 | | NAKINA |
| 2988 | WMCX | The Westinghouse Machine Co. (Westinghouse Electric & Manufacturing Co.—Machine Works) | 7/1923 | | NAKINA |
| 2989 | WMCX | L.H. Wentz (Oil Division) | 7/1935 | | NAKINA |
| 2990 | WMCX | Williams Molasses Co. | 4/1947-1/1950 | | NAKINA |
| 2991 | WMCX | *WESTINGHOUSE ELECTRIC & MFG. CO, MACHINE WORKS [WESTINGHOUSE MACHINE CO.] | | | PWRC |
| 2992 | WMCX | *WILLIAMS MOLASSES CO. | | | PWRC |
| 2993 | WMCX | Westmoreland Coal Company | | USA | TRAFFIC |
| 2994 | WMCY | WOEBER MUSTARD COMPANY | | | SCAC4 |
| 2995 | WMCZ | WESTMORELAND COAL COMPANY | | | PWRC |
| 2996 | WMED | WIERSMA, ED TRUCKING INC | | | SCAC4 |
| 2997 | WMEI | WESTERN MERCHANDISE EXPRESS INC | | | SCAC4 |
| 2998 | WMEP | W M E TRANSPORTATION | | | SCAC4 |
| 2999 | WMER | WEIMER, L & S TRUCKING LTD | | | SCAC4 |
| 3000 | WMES | WALSH MESSENGER SERVICE, INC | | | SCAC1 |
