| 1 | WS | Westjet Airlines Ltd. | ICAO: WJA, Callsign: Westjet, IATA Prefix: 838, Name changed to Westjet | CDN | AVCODES |
| 2 | WS | African International Airways | ICAO: AIN, Callsign: Fly Cargo, IATA Prefix: 648, Founded in 1985. Ceased operations in 2008. Designator WS recalled by IATA | ZA | AVCODES |
| 3 | WS | Schreiner Airways B.V. | ICAO: SCH, Callsign: Schreiner, Designator WS recalled by IATA | NL | AVCODES |
| 4 | WS | Caraibes Air Transport | ICAO: ISB, Callsign: Island Bird, Designator WS recalled by IATA | GP | AVCODES |
| 5 | WS | Westjet | ICAO: WJA, Callsign: Westjet, IATA Prefix: 838, Name changed from Westjet Airlines Ltd. | CDN | AVCODES |
| 6 | WS | Wiltshire School of Flying LTd. | Callsign: Aerowilt, | GB | AVCODES |
| 7 | WS | Ware Shoals R.R. Co. | 1/1975-1/1980; eliminated 1/1985 | | NAKINA |
| 8 | WS | Walkersville Southern R.R. | 1/1994-7/2005 | | NAKINA |
| 9 | WS | Ware Shoals R.R. Co. | 1/75-1/80; eliminated 1/85 | | NRHS |
| 10 | WS | Walkersville Southern R.R. | 1/94-7/2000 | | NRHS |
| 11 | WS | *WARE SHOALS RAILROAD | | | PWRC |
| 12 | WS | +WALKERSVILLE SOUTHERN RAILROAD | | | PWRC |
| 13 | WS | Ware Shoals Railroad | | | RSRV |
| 14 | WS | WALKERVILLE SOUTHERN RAILROAD INC | | | SCAC4 |
| 15 | WS | Sebastian Wetzel | | DE | VKM |
| 16 | WSA | Westates Airlines | Callsign: Westates, | USA | AVCODES |
| 17 | WSA | Westgates Airlines | | | ICAO1 |
| 18 | WSAC | WESTERN DEDICATED LP | | | SCAC4 |
| 19 | WSAG | WESTERN SHIPPING PTE LTD | | | SCAC4 |
| 20 | WSAJ | WESTERN STAR TRANSPORTATION | | | SCAC4 |
| 21 | WSAL | WESTERN SALES INC | | | SCAC4 |
| 22 | WSAM | WESTERN SHIPPING AMERICA INC | | | SCAC4 |
| 23 | WSAN | WSA LINES (INTL) LTD | | | SCAC4 |
| 24 | WSAO | WHITE, S A OIL CO INC | | | SCAC4 |
| 25 | WSAQ | WEICHENG SEA & AIR LOGISTICS LTD | | | SCAC4 |
| 26 | WSAR | WERTMAN, S A TRUCKING | | | SCAC4 |
| 27 | WSAS | WASHINGTON & SONS CORPORATION | | | SCAC4 |
| 28 | WSAT | WIL-TRANS | | | SCAC4 |
| 29 | WSAW | WILSON LAKE INC | | | SCAC4 |
| 30 | WSAY | WSA TRUCKING CO | | | SCAC1 |
| 31 | WSAY | WSA TRUCKING CO | | | SCAC4 |
| 32 | WSB | West Side Belt R.R. Co. (Pittsburgh & West Virgina Ry.) | 8/1920-7/1936 | | NAKINA |
| 33 | WSB | PITTSBURGH & WEST VIRGINIA RWY. [WEST SIDE BELT RAILROAD CO.] | | | PWRC |
| 34 | WSB | Wynental- und Suhrentalbahn | | CH | TRAFFIC |
| 35 | WSB | Wynental- und Suhrentalbahn (WSB) | | CH | VKM |
| 36 | WSBA | WAGONSERVICE travel, ltd | | SK | VKM |
| 37 | WSBB | W S BADCOCK CORP | | | SCAC4 |
| 38 | WSBD | WESTSIDE BUILDING SUPPLY | | | SCAC4 |
| 39 | WSBE | WEST & SONS TOWING INC | | | SCAC4 |
| 40 | WSBI | WEISS, MITCHELL W | | | SCAC4 |
| 41 | WSBK | W & S TRUCKING INC | | | SCAC4 |
| 42 | WSBQ | WISCONSIN REFRIGERATED EXPRESS INC | | | SCAC4 |
| 43 | WSBT | WESTFALL TRUCKING INC | | | SCAC4 |
| 44 | WSBY | WESTBY TRUCKING | | | SCAC4 |
| 45 | WSC | Gatwick Air Taxis Ltd. | Callsign: Gatwick Air, | GB | AVCODES |
| 46 | WSC | Westair Cargo Airlines | Callsign: Westcar, | CI | AVCODES |
| 47 | WSC | WESTERN STOCKYARDS CORP. | | | PWRC |
| 48 | WSC | WASHINGTON CHARTERS | | | SCAC4 |
| 49 | WSCC | WATERMAN STEAMSHIP CORP OF CALIF. | | | PWRC |
| 50 | WSCC | WESTGATE TRANSPORTATION COMPANY | | | SCAC4 |
| 51 | WSCE | WES STOR CONTAINER & TRANSPORTATION | | | SCAC4 |
| 52 | WSCG | WISE TRUCKING | | | SCAC4 |
| 53 | WSCH | WISCHMEIE | | | SCAC4 |
| 54 | WSCI | WRIGHT STUFF COMPANY LLC, THE | | | SCAC4 |
| 55 | WSCJ | WELTON SHIPPING CO INC | | | SCAC4 |
| 56 | WSCK | WESMAR STEEL CORPORATION | | | SCAC4 |
| 57 | WSCL | WATERFRONT SHIPPING COMPANY LIMITED | | | SCAC4 |
| 58 | WSCP | WESTONE COMPANY, THE | | | SCAC4 |
| 59 | WSCQ | WCI | | | SCAC4 |
| 60 | WSCS | WILLIS CONSTRUCTION CO INC | | | SCAC4 |
| 61 | WSCU | CARU CONTAINERS BV | | NL | BIC |
| 62 | WSCU | CONTAINER ASSOCIATION ROTTERDAM BV- | | | SCAC4 |
| 63 | WSCV | WEST SERVICE CENTER INC | | | SCAC4 |
| 64 | WSCX | Willibald Schaefer Co. | 7/1937-4/1938; added 1/1968; 4/1970; eliminated 10/1972 | | NAKINA |
| 65 | WSCX | Buffalo Brake Beam Co. | added 10/1980; eliminated 5/1983; 1/1994 (not listed) | | NAKINA |
| 66 | WSCX | Consumers Energy Co. | added 4/2007 | | NAKINA |
| 67 | WSCX | Willibald Schaefer Co. | 4/38; added 1/68; 4/70; eliminated 10/72 | | NRHS |
| 68 | WSCX | Buffalo Brake Beam Co. | added 10/80; eliminated 5/83; 1/94 | | NRHS |
| 69 | WSCX | *WILLIBALD SCHAEFER CO. | | | PWRC |
| 70 | WSCX | *BUFFALO BRAKE BEAM CO. | | | PWRC |
| 71 | WSCX | +CONSUMERS ENERGY CO. | | | PWRC |
| 72 | WSCX | Willibald Schaefer (Consumers Energy) | | | RSRV |
| 73 | WSCX | CONSUMERS ENERGY COMPANY | | | SCAC4 |
| 74 | WSCZ | WESTERN SUGAR CO. | | | PWRC |
| 75 | WSD | Westfield R.R. Co. | 7/1923 | | NAKINA |
| 76 | WSD | WESTFIELD RAILROAD CO. | | | PWRC |
| 77 | WSDI | WESTERN DIRECT EXPRESS LLC | | | SCAC4 |
| 78 | WSDU | WIDE SHINE DEVELOPMENT INC | | HK | BIC |
| 79 | WSDU | WIDE SHINE DEVELOPMENT LTD | | | SCAC4 |
| 80 | WSEA | WARM SEAS DEVELOPMENT AND TRADING C | | | SCAC4 |
| 81 | WSEC | W S EXPRESS | | | SCAC4 |
| 82 | WSEE | WESTERN PROVISIONS INC | | | SCAC4 |
| 83 | WSEH | WISEXPRES | | | SCAC4 |
| 84 | WSEK | WISE TRUCKING LLC | | | SCAC4 |
| 85 | WSEP | WESTERN ENGINEERED PRODUCTS INC | | | SCAC4 |
| 86 | WSER | WINLAND SERVICES | | | SCAC4 |
| 87 | WSET | WSE TRANSPORTATION LLC | | | SCAC4 |
| 88 | WSET | Westsächsische Eißenbahntransport Gesellschaft mbH | | DE | VKM |
| 89 | WSEY | WOLFE SERVICES | | | SCAC4 |
| 90 | WSF | West African Airlines | IATA: WZ, IATA designator changed to WZ | DY | AVCODES |
| 91 | WSF | West African Airlines | IATA Prefix: 682, Designator WZ recalled by IATA. IATA designator changed from WZ* | DY | AVCODES |
| 92 | WSF | West African Airlines | IATA: WZ | | ICAO1 |
| 93 | WSFB | WESTERN STATES FREIGHT | | | SCAC4 |
| 94 | WSFI | WALLIS FLATS INC | | | SCAC4 |
| 95 | WSFO | WES-FLO COMPANY INC | | | SCAC4 |
| 96 | WSFT | WATKINS AND SHEPARD TRUCKING INC (F | | | SCAC4 |
| 97 | WSFX | W.S. Forbes & Co., Inc. | 8/1920 | | NAKINA |
| 98 | WSFX | W. S. FORBES & CO. INC. | | | PWRC |
| 99 | WSG | Wasaya Airways L.P. | IATA: WG, Callsign: Wasaya, IATA Prefix: 093, IATA designator changed to WT. Name changed from Wasaya Airways Ltd. | CDN | AVCODES |
| 100 | WSG | Wasaya Airways Ltd. | IATA: WG, Callsign: Wasaya, IATA Prefix: 093, Name changed to Wasaya Airways L.P. | CDN | AVCODES |
