| 1 | WAS | Walsten Air Services (1986) Ltd. | Callsign: Walsten, | CDN | AVCODES |
| 2 | WAS | Walsten Air Services | | | ICAO1 |
| 3 | WAS | Waynesburg Southern | 1/1975-1/1980 | | NAKINA |
| 4 | WAS | Waynesburg Southern | 1/75-1/80 | | NRHS |
| 5 | WAS | WAYNESBURG SOUTHERN | | | PWRC |
| 6 | WAS | Waynesburg Southern | | | RSRV |
| 7 | WAS | Warsaw Airport Services Ltd. | | PL | TRAFFIC |
| 8 | WASC | WASTE CONTROL RECYCLING INC | | | SCAC4 |
| 9 | WASC | Wascosa | | D | TRAFFIC |
| 10 | WASCO | WASCOSA AG, Luzern | | CH | VKM |
| 11 | WASD | WILLARD AGRI-SERVICE OF GREENWOOD L | | | SCAC4 |
| 12 | WASE | WASATCH EXPRESS INC | | | SCAC4 |
| 13 | WASF | WILLARD AGRI-SERVICE OF FREDERICK I | | | SCAC4 |
| 14 | WASG | WASS TRUCKING CO | | | SCAC4 |
| 15 | WASH | WASHITA VALLEY TRUCKING CO LLC | | | SCAC4 |
| 16 | WASHS | Washington Street IBOA | | USA | TRAFFIC |
| 17 | WASI | WEST ASIA MARITIME OVERSEAS PRIVATE | | | SCAC4 |
| 18 | WASM | WASHINGTON MILLS TRANSPORT CORP. | | | SCAC4 |
| 19 | WASQ | WILLARD AGRI SERVICE OF MT AIRY | | | SCAC4 |
| 20 | WASR | WASS TRUCKING | | | SCAC4 |
| 21 | WASS | WALL STREET SYSTEMS INC | | | SCAC4 |
| 22 | WAST | WASTECORP PUMPS LLC | | | SCAC4 |
| 23 | WASV | WILLARD AGRI SERVICE OF LYNCH INC | | | SCAC4 |
| 24 | WASW | WILLAMETTE AG SERVICES INC | | | SCAC4 |
| 25 | WASX | Wm. A. Smith Construction Co., Inc. | added 7/1985; eliminated 4/1987 | | NAKINA |
| 26 | WASX | Wm. A. Smith Construction Co., Inc. | eliminated 4/87 | | NRHS |
| 27 | WASX | *WM. A. SMITH CONSTRUCTION CO., INC. | | | PWRC |
| 28 | WASX | +ALLEGHENY RAW MATERIALS, INC. | | | PWRC |
| 29 | WASX | ALLEGHENY RAW MATERIALS INC | | | SCAC4 |
| 30 | WASY | WASAYA PROP SHOP LIMITED PARTNERSHI | | | SCAC4 |
