| 1 | WH | China Northwest Airlines | ICAO: CNW, Callsign: China Northwest, IATA Prefix: 783, Merged into China Eastern. Formerly CAAC Xian region | PRC | AVCODES |
| 2 | WH | West Africa Airlines Ltd. | ICAO: WCB, Callsign: Kilo Yankee, Ceased operations. | GH | AVCODES |
| 3 | WH | Wihuri-Yhtynä Oy | Callsign: Wihuri, | FIN | AVCODES |
| 4 | WH | Webjet Linhas Aéreas | ICAO: WEB, Callsign: Webjet, Founded in 2005. Ceased operations on 23 November 2012. Designator WH* reinstated by IATA. IATA designator changed from WJ* | BR | AVCODES |
| 5 | WH | WDL Aviation GmbH & Co. KG | ICAO: WDL, Callsign: WDL, IATA Prefix: 944, Name changed to German Airways. ICAO designator changed to GER. Designator WD recalled by IATA. | D | AVCODES |
| 6 | WH | La Nueva Aerolinea, S.A. t/a wingo | ICAO: WWP, Callsign: Wingo Panama, | PA | AVCODES |
| 7 | WH | Wehrmacht | | D | TRAFFIC |
| 8 | WHA | Westhighland Aviation Ltd. | Callsign: Skye Line, | GB | AVCODES |
| 9 | WHAA | WESTERN HARVEST | | | SCAC4 |
| 10 | WHAB | WHITE SEA NAVIGATION S A | | | SCAC4 |
| 11 | WHAE | WINCHESTER AIR EXPRESS INC | | | SCAC4 |
| 12 | WHAF | WHATCOM FARMERS CO-OP | | | SCAC4 |
| 13 | WHAG | WAECHTER, LLC | | | SCAC4 |
| 14 | WHAJ | WEE HAUL TRANSPORT INC | | | SCAC4 |
| 15 | WHAN | WHALEN TRUCKING, INC | | | SCAC1 |
| 16 | WHAY | WESTERN HAY COMPANY INC | | | SCAC4 |
| 17 | WHB | Forty Eight Aviation Co. Ltd | Callsign: Hosham Air, | SUD | AVCODES |
| 18 | WHBN | WHITEHEAD, BENNY INC | | | SCAC4 |
| 19 | WHBO | WREN, H B OIL CO INC | | | SCAC4 |
| 20 | WHBR | WHITE BROTHERS TRUCKING CO. | | | SCAC1 |
| 21 | WHBW | WEARCHECK CANADA INC | | | SCAC4 |
| 22 | WHC | Whitehaven Coal | | AUS | TRAFFIC |
| 23 | WHCB | WHEATLAND COOPERATIVE ASSOCIATION | | | SCAC4 |
| 24 | WHCE | WHITTIER CANADA ENTERPRISE INC | | | SCAC4 |
| 25 | WHCG | WALSH OIL | | | SCAC4 |
| 26 | WHCH | WHITCHURCH & SON TRANSPORTATION | | | SCAC1 |
| 27 | WHCL | WHATLEY, CHARLES TRUCKING | | | SCAC4 |
| 28 | WHCP | W & H CO-OP OIL | | | SCAC4 |
| 29 | WHCQ | WHITE TRANSFER & STORAGE COMPANY | | | SCAC4 |
| 30 | WHCT | WHITES CROSSING TRUCKING | | | SCAC4 |
| 31 | WHCU | U.S. DEPARTMENT OF ENERGY | | | PWRC |
| 32 | WHCU | US Department of Energy | | | RSRV |
| 33 | WHCX | Western Hay Co. Inc. | 7/2005 (not listed) | | NAKINA |
| 34 | WHCX | WESTERN HAY CO., INC. | | | PWRC |
| 35 | WHCX | Western Hay Corporation | | | RSRV |
| 36 | WHCX | WESTERN HAY COMPANY INC | | | SCAC4 |
| 37 | WHDS | WHEELS AUTOMOTIVE DEALER SUPPLIES I | | | SCAC4 |
| 38 | WHDT | WHITE, DAVID TRUCKING | | | SCAC4 |
| 39 | WHDV | WEE-HAUL DELIVERY | | | SCAC4 |
| 40 | WHDX | The Western Heater Despatch | 8/1920-7/1923 | | NAKINA |
| 41 | WHDX | The Western Heater Despatch, series 400-1199 (Chicago & Northwestern Ry.) | 7/1923 | | NAKINA |
| 42 | WHDX | CHICAGO & NORTHWESTERN RWY. (WESTERN HEATER DESPATCH) | | | PWRC |
| 43 | WHE | Westland Helicopters Ltd. | Callsign: Westland, Name changed to AgustaWestland Helicopters Ltd. | GB | AVCODES |
| 44 | WHE | AgustaWestland Helicopters Ltd. | Callsign: Westland, Name changed to Leonardo MW Limited on 01 January 2017. Name changed from Westland Helicopters Ltd. | GB | AVCODES |
| 45 | WHE | Leonardo MW Limited | Callsign: Westland, Name changed to Leonardo UK Limited w.e.f. 31 March 2021. Name changed from AgustaWestland Helicopters Ltd on 01 January 2017. | GB | AVCODES |
| 46 | WHE | Leonardo UK Limited | Callsign: Westland, Name changed from Leonardo MW Limited and previously AgustaWestland Helicopters Ltd on 01 January 2017. | GB | AVCODES |
| 47 | WHE | Westland Helicopters | | | ICAO1 |
| 48 | WHE | Wanne-Herner Eisenbahn und Hafen GmbH | Wanne | D | privat-bahn.de |
| 49 | WHE | Wanne-Bochum-Herner Eisenbahn und Hafen GmbH | This company operates freight trains on Wanne Westhafen-Wanne Herzogstraße/Bochum Graetz. | D | TRAFFIC |
| 50 | WHE | Wanne-Herner Eisenbahn und Hafen | | DE | VKM |
| 51 | WHEA | WHEATLAND STEEL PROCESSING | | | SCAC4 |
| 52 | WHEC | WORLD HEALING CENTER CHURCH INC | | | SCAC4 |
| 53 | WHEI | WIEBE, HEINRICH | | | SCAC4 |
| 54 | WHEQ | WHISLER EQUIPMENT CO. | | | PWRC |
| 55 | WHER | Walking Horse & Eastern Railroad | | USA | TRAFFIC |
| 56 | WHES | WHEATON TRANSPORT INC | | | SCAC4 |
| 57 | WHF | Wald-Holz-Forst GbR, Scheibe-Alsbach | | D | TRAFFIC |
| 58 | WHF | Wald-Holz-Forst Gbr | | DE | VKM |
| 59 | WHFB | WEATHERFORD LABORATORIES (CANADA) L | | | SCAC4 |
| 60 | WHFC | WUNSCH FEED CO | | | SCAC4 |
| 61 | WHFE | WEST HILLS FUELS INC | | | SCAC4 |
| 62 | WHFI | WRIGHTHOLM FARM INC | | | SCAC4 |
| 63 | WHFL | WINDHAVEN FARMS LIMITED | | | SCAC4 |
| 64 | WHFM | WINDY HILL FARMS | | | SCAC4 |
| 65 | WHFT | WHITEFORD TRANSPORT INC | | | SCAC4 |
| 66 | WHG | Zhejiang Wanfeng General Aviation Co., Ltd. | Callsign: Cheer, | PRC | AVCODES |
| 67 | WHGK | WRIGHT, HENRY G TRUCKING LLC | | | SCAC4 |
| 68 | WHGL | WHITE TANNING CO LTD | | | SCAC4 |
| 69 | WHGN | WILLOW HOLLOW GAME RANCH LTD | | | SCAC4 |
| 70 | WHGP | WAH SING TRANSPORT INC | | | SCAC4 |
| 71 | WHGR | WELCH, GEORGE TRUCKING | | | SCAC4 |
| 72 | WHGS | WHG TRUCKING | | | SCAC4 |
| 73 | WHGT | WHITTLINGTON TRANSPORT | | | SCAC4 |
| 74 | WHGU | GE Heat Recovery Solutions | | | RSRV |
| 75 | WHGU | CALNETIX POWER SOLUTIONS | | | SCAC4 |
| 76 | WHH | Richy Slylark Pvt Ltd. | | CL | AVCODES |
| 77 | WHHI | WESTERN HEAVY HAUL INC | | | SCAC4 |
| 78 | WHHN | WHITEHORSE TRANSPORT INC | | | SCAC4 |
| 79 | WHHO | WHITEHEAD OIL CO INC | | | SCAC4 |
| 80 | WHI | Burlington Northern Inc. | added 10/1975; 1/1980; eliminated 7/1981 | | NAKINA |
| 81 | WHI | Burlington Northern R.R. Co. | added 7/1981; eliminated 7/1985; added 10/1985; eliminated 4/1995 | | NAKINA |
| 82 | WHI | Burlington Northern Inc. | 1/80; eliminated 7/81 | | NRHS |
| 83 | WHI | Burlington Northern R.R. Co. | added 7/81; eliminated 4/95 | | NRHS |
| 84 | WHI | BURLINGTON NORTHERN RAILROAD | | | PWRC |
| 85 | WHI | BNSF Railway | | | RSRV |
| 86 | WHIC | WHITE CO | | | SCAC4 |
| 87 | WHID | WHIDBEY SEATAC SHUTTLE | | | SCAC4 |
| 88 | WHIE | WHITENER ENTERPRISES INCORPORATED | | | SCAC4 |
| 89 | WHIF | WHITFIELD OIL CO INC | | | SCAC4 |
| 90 | WHIH | WHITEHURST TRANSPORT INC | | | SCAC4 |
| 91 | WHIJ | WESTERN HIWAYS | | | SCAC4 |
| 92 | WHIK | WILLIAMS HEATING INC | | | SCAC4 |
| 93 | WHIM | WHIMSY INC | | | SCAC4 |
| 94 | WHIN | WHIN EXPRESS INC | | | SCAC4 |
| 95 | WHIP | WHIPCO TRUCKING | | | SCAC4 |
| 96 | WHIR | WHITE INC | | | SCAC4 |
| 97 | WHIT | WHITLEY FUEL L L C | | | SCAC4 |
| 98 | WHITEB | White Bus Company | | US-NJ | TRAFFIC |
| 99 | WHIX | Western Fruit Express Co. | 1/1950-1/1980; eliminated 1/1981 | | NAKINA |
| 100 | WHIX | Western Fruit Express Co. | 1/52-1/80; eliminated 1/81 | | NRHS |
