| 2501 | WJLK | WERDEN, JOHN LIVESTOCK LTD | | | SCAC4 |
| 2502 | WJLN | WORLD JAGUAR LOGISTICS INC | | | SCAC4 |
| 2503 | WJLT | WILSON, JIM LOGGING & TRUCKING | | | SCAC4 |
| 2504 | WJM | Windsor Jet Management | Callsign: Windsor Jet, | USA | AVCODES |
| 2505 | WJMS | WALKER, JAMES MICHAEL | | | SCAC4 |
| 2506 | WJMX | The W.J. McCahan Sugar Refining & Molasses Co. | 7/1935-1/1943 | | NAKINA |
| 2507 | WJMX | William J. McCormack Sand Division, Penn Industries, Inc. | added 10/1971; 1/1975; eliminated 4/1977 | | NAKINA |
| 2508 | WJMX | The W.J. McCahan Sugar Refining & Molasses Co. | Apr-38 | | NRHS |
| 2509 | WJMX | William J. McCormack Sand Division, Penn Industries, Inc. | added 10/71; 1/75 | | NRHS |
| 2510 | WJMX | *W. J. MCCAHAN SUGAR REFINING & MOLASSES CO. | | | PWRC |
| 2511 | WJMX | *WM. J. MCCORMACK SAND DIV., PENN INDUSTRIES, INC. | | | PWRC |
| 2512 | WJON | WALL, JOHN D | | | SCAC4 |
| 2513 | WJOY | WADE JOORISITY | | | SCAC4 |
| 2514 | WJRI | WAJIRO EXPRESS INC | | | SCAC4 |
| 2515 | WJRJ | WATTS JR, RICHARD A TRUCKING INC | | | SCAC4 |
| 2516 | WJRN | WALKO, JOHN RACING INC | | | SCAC4 |
| 2517 | WJRT | WRIGHT, JOHN R TRUCKING | | | SCAC4 |
| 2518 | WJS | West Jersey and Seashore Railroad | | USA | TRAFFIC |
| 2519 | WJSC | WJS LOGISTICS | | | SCAC4 |
| 2520 | WJSL | WEST JERSEY SHORT LINE | | | PWRC |
| 2521 | WJSU | WOOJIN GLOBAL LOGISTICS | | ROK | BIC |
| 2522 | WJSU | WOOJIN GLOBAL LOGISTICS | | | SCAC4 |
| 2523 | WJT | Wijet | Callsign: Wijet, | F | AVCODES |
| 2524 | WJTC | WON JIN TRANSPORTATION CO LTD | | | SCAC4 |
| 2525 | WJTI | WRIGHT, JIMMY TRUCKING INC | | | SCAC4 |
| 2526 | WJTK | WJ TRUCKING | | | SCAC4 |
| 2527 | WJTN | WJ TRUCKINT LTD | | | SCAC4 |
| 2528 | WJTR | W J TRANSPORTATION INC | | | SCAC4 |
| 2529 | WJWA | WJW ASSOCIATES LTD | | | SCAC4 |
| 2530 | WJWG | WARNER JR, WILLIAM TRUCKING | | | SCAC4 |
| 2531 | WJWK | WILLIAMS, JACKIE WILSON | | | SCAC4 |
| 2532 | WJWL | WJW LOGISTIC SERVICES INC | | | SCAC4 |
| 2533 | WJWT | WJW TRANSPORT INC | | | SCAC4 |
| 2534 | WJZ | WILSON JONES | | | PWRC |
| 2535 | WK | American Falcon, S.A. | ICAO: AFB, Callsign: American Falcon, IATA Prefix: 676, | RA | AVCODES |
| 2536 | WK | Greenair | ICAO: GRN, | TR | AVCODES |
| 2537 | WK | Westküstenflug | ICAO: WKF, | D | AVCODES |
| 2538 | WK | Western Alaska Airlines, Inc. | Callsign: Western Alaska, | USA | AVCODES |
| 2539 | WK | Edelweiss Air AG | ICAO: EDW, Callsign: Edelweiss, IATA Prefix: 945, IATA Designator changed from 8R*. IATA desigantor changed 1I, then from 5H* | CH | AVCODES |
| 2540 | WKAF | WILL TRUCK | | | SCAC4 |
| 2541 | WKAG | Weiacher Kies AG | | CH | TRAFFIC |
| 2542 | WKAG | Weiacher Kies AG | | CH | VKM |
| 2543 | WKAL | WEAVER, K L TRUCKING | | | SCAC4 |
| 2544 | WKAY | WESKAY LLC | | | SCAC4 |
| 2545 | WKB | Wittlager Kreisbahn | | D | TRAFFIC |
| 2546 | WKC | Western Kenya Aircharters Co. Ltd. | Callsign: Mushroom, | EAK | AVCODES |
| 2547 | WKCI | WASATCH TANK LINES LLC | | | SCAC4 |
| 2548 | WKCT | WOODS, KC TRUCKING INC | | | SCAC4 |
| 2549 | WKCY | WAKE & CO INC | | | SCAC4 |
| 2550 | WKD | Warszawska Kolej Dojazdowa sp. z o.o. | | PL | VKM |
| 2551 | WKDC | WILKINS DRAYING CO | | | SCAC1 |
| 2552 | WKDC | WEST-K TRUCKING | | | SCAC4 |
| 2553 | WKDL | WHITAKER LAND & LIVESTOCK INC | | | SCAC4 |
| 2554 | WKDR | WICKS, DEREK | | | SCAC4 |
| 2555 | WKDS | WALKER TEMPLE LOGISTICS GROUP LLC | | | SCAC4 |
| 2556 | WKEB | WINKLE OIL CO INC | | | SCAC4 |
| 2557 | WKEC | WHITAKER TRANSPORTATION COMPANY INC | | | SCAC4 |
| 2558 | WKEE | WARNER, KURT ENTERPRISES LLC | | | SCAC4 |
| 2559 | WKEH | WINKELS, LUKE | | | SCAC4 |
| 2560 | WKEI | WILKES TRANSPORT, INC | | | SCAC1 |
| 2561 | WKEL | WINKEL DISTRIBUTING COMPANY | | | SCAC4 |
| 2562 | WKES | WICKER SERVICES, INC | | | SCAC1 |
| 2563 | WKES | WICKER SERVICES INC | | | SCAC4 |
| 2564 | WKF | Westküstenflug | IATA: WK, | D | AVCODES |
| 2565 | WKFD | WAKEFIELD OIL CO INC | | | SCAC4 |
| 2566 | WKFT | WKF TRANSPORT INC | | | SCAC4 |
| 2567 | WKGE | WORKING ENVIRONMENTS | | | SCAC4 |
| 2568 | WKGN | WEISS, KURT GREENHOUSES INC | | | SCAC4 |
| 2569 | WKH | Kharkov Aircraft Manufacturing Company | Callsign: West-Kharkov, | UA | AVCODES |
| 2570 | WKH | Kharkov Aircraft Manufacturing Company | | | ICAO1 |
| 2571 | WKHA | Wilhelm Kemming GmbH | | DE | VKM |
| 2572 | WKHI | W K HEAVY HAUL INC | | | SCAC4 |
| 2573 | WKHX | Rail Connection, Inc. | added 10/2003; 7/2005 | | NAKINA |
| 2574 | WKHX | RAIL CONNECTION, INC. | | | PWRC |
| 2575 | WKHX | RAIL CONNECTION INC | | | SCAC4 |
| 2576 | WKIF | WILK INC | | | SCAC4 |
| 2577 | WKIL | WICKENS INDUSTRIAL LIMITED | | | SCAC4 |
| 2578 | WKIZ | WYCOFF INDUSTRIES | | | PWRC |
| 2579 | WKJM | WAKE, JIM TRUCKING | | | SCAC4 |
| 2580 | WKJS | WALLNYK JOINT SERVICE STOCKHOLM | | | SCAC4 |
| 2581 | WKJT | WALKER'S, JIM, TRANSFER CO | | | SCAC1 |
| 2582 | WKKT | WALKER, KENNETH TRUCKING INC | | | SCAC4 |
| 2583 | WKLB | WHITAKER ENTERPRISE CONTRACTOR LLC | | | SCAC4 |
| 2584 | WKLI | WHITE KNIGHT LIMOUSINE INC | | | SCAC4 |
| 2585 | WKLL | WALKER, L E TRANSPORT LTD | | | SCAC4 |
| 2586 | WKLR | WESTERN KENTUCKY RAILWAY, LLC | | | PWRC |
| 2587 | WKLS | WALKER LOGISTICS INC | | | SCAC4 |
| 2588 | WKLY | WEEKLEYS TRUCKING CO LLC | | | SCAC4 |
| 2589 | WKM | West Kent Motor Services | | GB | TRAFFIC |
| 2590 | WKMN | WINKELMOLEN NURSERY LTD | | | SCAC4 |
| 2591 | WKMP | WHITE OAK MOUNTAIN TRANSPORTATION | | | SCAC4 |
| 2592 | WKMR | WEEKS MARINE INC | | | SCAC4 |
| 2593 | WKMT | WAUKA MOUNTAIN TANKER SERVICE INC | | | SCAC4 |
| 2594 | WKMW | WAH KWONG MARITIME AGENCY COMPANY L | | | SCAC4 |
| 2595 | WKN | WESTMONTAGE Kabel und Netzwerk GmbH | | DE | VKM |
| 2596 | WKNB | WILKINS BUS LINES INC | | | SCAC4 |
| 2597 | WKNG | WATKINS TRUCKING CO INC | | | SCAC4 |
| 2598 | WKNO | WATKINS OIL CO INC | | | SCAC4 |
| 2599 | WKNP | W K TRANSPORT | | | SCAC4 |
| 2600 | WKNT | WESTON, KEVIN TRUCKING | | | SCAC4 |
