| 1 | WJ | Labrador Airways Limited | ICAO: LAL, Callsign: Lab Air, IATA Prefix: 927, Name changed to Air Labrador Limited. ICAO callsign changed to Air Labrador. Designator WJ reinstated by IATA | CDN | AVCODES |
| 2 | WJ | Webjet Linhas Aéreas | ICAO: WEB, Callsign: Webjet, IATA designator changed to WH*. | BR | AVCODES |
| 3 | WJ | Nihon Kinkyori Airways | ICAO: NKK, Callsign: Kinkyiro, Name changed to Air Nippon Co. Ltd. | J | AVCODES |
| 4 | WJ | Air Nippon Co. Ltd. | ICAO: NKK, Callsign: Ank Air, ICAO designator changed to ANK. Name changed from Nihon Kinkyori Airways. | J | AVCODES |
| 5 | WJ | Air Labrador Limited | ICAO: LAL, Callsign: Air Labrador, IATA Prefix: 927, Ceased operations in June 2017. Name changed from Labrador Airways Limited. ICAO callsign changed from Lab Air. Designator WJ reinstated by IATA | CDN | AVCODES |
| 6 | WJ | JetSmart Airlines S.A. | ICAO: JES, Callsign: Smartbird, | RA | AVCODES |
| 7 | WJ | West Jersey R.R. Co. | 1/1994 | | NAKINA |
| 8 | WJ | West Michigan R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 9 | WJ | West Jersey R.R. Co. | Jan-94 | | NRHS |
| 10 | WJ | West Michigan R.R. Co. | Jul-00 | | NRHS |
| 11 | WJ | *WEST JERSEY RAILROAD COMPANY | | | PWRC |
| 12 | WJ | +WEST MICHIGAN RAILROAD COMPANY | | | PWRC |
| 13 | WJ | West Michigan Railroad | | | RSRV |
| 14 | WJ | Weber & Junge GmbH | | DE | VKM |
| 15 | WJA | Westjet Airlines Ltd. | IATA: WS, Callsign: Westjet, IATA Prefix: 838, Name changed to Westjet | CDN | AVCODES |
| 16 | WJA | Westjet Airlines Ltd. | IATA: M3, Callsign: Westjet, IATA designator changed to WS | CDN | AVCODES |
| 17 | WJA | Westjet | IATA: WS, Callsign: Westjet, IATA Prefix: 838, Name changed from Westjet Airlines Ltd. | CDN | AVCODES |
| 18 | WJA | WestJet | IATA: WS | | ICAO1 |
| 19 | WJAK | WAGNER, JOHN A TRUCKING LLC | | | SCAC4 |
| 20 | WJAL | WRODA, JIM AUCTION SERVICES LTD | | | SCAC4 |
| 21 | WJAS | WYMAN, JASPER AND SON | | | SCAC4 |
| 22 | WJCL | WJC LLC | | | SCAC4 |
| 23 | WJDH | WILLIAMS, J D HOTSHOT SERVICE LLC | | | SCAC4 |
| 24 | WJDK | WAGNER, JAMES D TRUCKING | | | SCAC4 |
| 25 | WJDT | WILLIAMS, J & D | | | SCAC4 |
| 26 | WJEA | WILLIAMS, JOHN AND ELLEN ANTIQUES | | | SCAC4 |
| 27 | WJES | WYNN, JESSE | | | SCAC4 |
| 28 | WJGD | WHITE, JASON GERARD | | | SCAC4 |
| 29 | WJHG | W J H II TRUCKING LLC | | | SCAC4 |
| 30 | WJHI | WOLFORD, J H TRUCKING | | | SCAC4 |
| 31 | WJIT | WEBER, JIM TRUCKING INC | | | SCAC4 |
| 32 | WJLK | WERDEN, JOHN LIVESTOCK LTD | | | SCAC4 |
| 33 | WJLN | WORLD JAGUAR LOGISTICS INC | | | SCAC4 |
| 34 | WJLT | WILSON, JIM LOGGING & TRUCKING | | | SCAC4 |
| 35 | WJM | Windsor Jet Management | Callsign: Windsor Jet, | USA | AVCODES |
| 36 | WJMS | WALKER, JAMES MICHAEL | | | SCAC4 |
| 37 | WJMX | The W.J. McCahan Sugar Refining & Molasses Co. | 7/1935-1/1943 | | NAKINA |
| 38 | WJMX | William J. McCormack Sand Division, Penn Industries, Inc. | added 10/1971; 1/1975; eliminated 4/1977 | | NAKINA |
| 39 | WJMX | The W.J. McCahan Sugar Refining & Molasses Co. | Apr-38 | | NRHS |
| 40 | WJMX | William J. McCormack Sand Division, Penn Industries, Inc. | added 10/71; 1/75 | | NRHS |
| 41 | WJMX | *W. J. MCCAHAN SUGAR REFINING & MOLASSES CO. | | | PWRC |
| 42 | WJMX | *WM. J. MCCORMACK SAND DIV., PENN INDUSTRIES, INC. | | | PWRC |
| 43 | WJON | WALL, JOHN D | | | SCAC4 |
| 44 | WJOY | WADE JOORISITY | | | SCAC4 |
| 45 | WJRI | WAJIRO EXPRESS INC | | | SCAC4 |
| 46 | WJRJ | WATTS JR, RICHARD A TRUCKING INC | | | SCAC4 |
| 47 | WJRN | WALKO, JOHN RACING INC | | | SCAC4 |
| 48 | WJRT | WRIGHT, JOHN R TRUCKING | | | SCAC4 |
| 49 | WJS | West Jersey and Seashore Railroad | | USA | TRAFFIC |
| 50 | WJSC | WJS LOGISTICS | | | SCAC4 |
| 51 | WJSL | WEST JERSEY SHORT LINE | | | PWRC |
| 52 | WJSU | WOOJIN GLOBAL LOGISTICS | | ROK | BIC |
| 53 | WJSU | WOOJIN GLOBAL LOGISTICS | | | SCAC4 |
| 54 | WJT | Wijet | Callsign: Wijet, | F | AVCODES |
| 55 | WJTC | WON JIN TRANSPORTATION CO LTD | | | SCAC4 |
| 56 | WJTI | WRIGHT, JIMMY TRUCKING INC | | | SCAC4 |
| 57 | WJTK | WJ TRUCKING | | | SCAC4 |
| 58 | WJTN | WJ TRUCKINT LTD | | | SCAC4 |
| 59 | WJTR | W J TRANSPORTATION INC | | | SCAC4 |
| 60 | WJWA | WJW ASSOCIATES LTD | | | SCAC4 |
| 61 | WJWG | WARNER JR, WILLIAM TRUCKING | | | SCAC4 |
| 62 | WJWK | WILLIAMS, JACKIE WILSON | | | SCAC4 |
| 63 | WJWL | WJW LOGISTIC SERVICES INC | | | SCAC4 |
| 64 | WJWT | WJW TRANSPORT INC | | | SCAC4 |
| 65 | WJZ | WILSON JONES | | | PWRC |
