| 1 | WY | Oman Aviation Services Co. (SAOG) | ICAO: OAS, Callsign: Oryx, IATA Prefix: 910, Name changed to Oman Air (SAOG). ICAO callsign changed from Whiskey Yankee | OM | AVCODES |
| 2 | WY | Oman Air | ICAO: OMA, Callsign: Oman Air, IATA Prefix: 910, ICAO callsign changed from Khanjar | OM | AVCODES |
| 3 | WY | Oman Air (SAOG) | ICAO: OAS, Callsign: Oryx, IATA Prefix: 910, Name changed from Oman Aviation Services Co. (SAOG) | OM | AVCODES |
| 4 | WY | Oman Aviation Services Co. (SAOG) | ICAO: OAS, Callsign: Whiskey Yankee, IATA Prefix: 910, Name changed to Oman Air (SAOG). ICAO callsign changed to Oryx | OM | AVCODES |
| 5 | WYAR | WYATT TRANSPORTATION LLC | | | SCAC4 |
| 6 | WYBE | WYNNE TRUCKING LLC | | | SCAC4 |
| 7 | WYBN | WYO-BRASKA NORTH AMERICAN VAN LINES | | | SCAC4 |
| 8 | WYBR | WAY-BRI EXPRESS | | | SCAC4 |
| 9 | WYC | Wycombe Air Centre Limited | Callsign: Wycombe, Name changed to Booker Aircraft Operations Ltd. t/a Wycombe Air Centre and Airways Flying Club | GB | AVCODES |
| 10 | WYC | Booker Aircraft Operations Ltd. t/a Wycombe Air Centre and Airways Flying Club | Callsign: Wycombe, Name changed to Airways Aero Associations Ltd t/a Booker Aviation. Name changed from Wycombe Air Centre Limited. | GB | AVCODES |
| 11 | WYC | Airways Aero Associations Ltd t/a Booker Aviation | Callsign: Wycombe, Name changed from Booker Aircraft Operations Ltd. t/a Wycombe Air Centre and Airways Flying Club.. Name changed from Wycombe Air Centre Limited. | GB | AVCODES |
| 12 | WYC | Wycombe Air Centre | | | ICAO1 |
| 13 | WYCO | Wyoming & Colorado R.R. | 1/1994-7/2005 | | NAKINA |
| 14 | WYCO | Wyoming & Colorado R.R. | 1/94-7/2000 | | NRHS |
| 15 | WYCO | WYOMING & COLORADO RAILROAD | | | PWRC |
| 16 | WYCO | Wyoming and Colorado Railroad | | | RSRV |
| 17 | WYCX | Weyerhauser Canada Ltd. | added 1/1972; 1/1975-7/2000; eliminated 7/2004; 7/2005 (not listed); eliminated 10/2008 | | NAKINA |
| 18 | WYCX | Domtar | added 10/2008 | | NAKINA |
| 19 | WYCX | Weyerhauser Canada Ltd. | added 1/72; 1/75-7/2000 | | NRHS |
| 20 | WYCX | *WEYERHAUSER CANADA LTD | | | PWRC |
| 21 | WYCX | +DOMTAR | | | PWRC |
| 22 | WYCX | Weyerhauser Canada | | | RSRV |
| 23 | WYCX | WEYERHAU | | | SCAC4 |
| 24 | WYDC | WAYS TRANSPORT LTD | | | SCAC4 |
| 25 | WYDR | WYLD ROSE TRANSPORT | | | SCAC4 |
| 26 | WYEC | Wye Transportation Co. | 1/1994-7/2005 | | NAKINA |
| 27 | WYEC | Wye Transportation Co. | 1/94-7/2000 | | NRHS |
| 28 | WYEC | WYE TRANSPORTATION CO. | | | PWRC |
| 29 | WYEC | Wye Transportation | | | RSRV |
| 30 | WYER | WHEBBYS RACING STABLES | | | SCAC4 |
| 31 | WYEZ | WYE COMPANY | | | PWRC |
| 32 | WYF | Wayfarer Aviation, Inc. | Callsign: Wayfarer, Ceased operations on 11 June 2010. | USA | AVCODES |
| 33 | WYFI | WAYLAND FARMS INC | | | SCAC4 |
| 34 | WYG | Wyoming Airlines Ltd. | Callsign: Wyoming, | USA | AVCODES |
| 35 | WYG | Wyoming Airlines | | | ICAO1 |
| 36 | WYGE | WEYGANDT ENGINEERING CO | | | SCAC4 |
| 37 | WYIE | WYIER, H. A., CORPORATION | | | SCAC1 |
| 38 | WYJI | WAYNE J. INDUSTRIES, INC | | | SCAC1 |
| 39 | WYLC | WYLIE, E W CORPORATION | | | SCAC4 |
| 40 | WYLN | WAYLON TRANSPORT LTD | | | SCAC4 |
| 41 | WYM | M&N Aviation | Callsign: World Class, | USA | AVCODES |
| 42 | WYMO | WYMAN OIL CO INC | | | SCAC4 |
| 43 | WYMY | WYLIE MYCOLOGICALS LTD | | | SCAC4 |
| 44 | WYNC | WYNECO TRANSPORTATION | | | SCAC4 |
| 45 | WYNI | WYNSTAR INC | | | SCAC4 |
| 46 | WYNO | WAYNE PETROLEUM CORP | | | SCAC4 |
| 47 | WYNT | WYNNE TRANSPORT SERVICE, INC | | | SCAC4 |
| 48 | WYNY | WAYNE CITY TRANSPORTATION INC | | | SCAC4 |
| 49 | WYO | Wyoming Ry. Co. | 7/1923-1/1950 | | NAKINA |
| 50 | WYO | Wyoming Ry. Co. | Apr-38 | | NRHS |
| 51 | WYO | WYOMING RWY. CO. | | | PWRC |
| 52 | WYOB | WORLEY & OBETZ INC | | | SCAC4 |
| 53 | WYPTE | West Yorkshire Passenger Transport Executive | | GB | TRAFFIC |
| 54 | WYRT | WESTAYR TRANSPORTATION SYSTEMS | | | SCAC4 |
| 55 | WYS | Wyandotte Southern R.R. Co. | 1/1975-1/1980; eliminated 4/1987; 1/1994-7/2005 | | NAKINA |
| 56 | WYS | Wyandotte Southern R.R. Co. | 1/75-1/80; eliminated 4/87; 1/94-7/2000 | | NRHS |
| 57 | WYS | WYANDOTTE SOUTHERN RAILROAD CO. | | | PWRC |
| 58 | WYS | Wyandotte Southern Railroad | | | RSRV |
| 59 | WYSC | WAYNE STEEL DISTRIBUTION CENTER INC | | | SCAC4 |
| 60 | WYSE | WISE LOGISTICS LLC | | | SCAC4 |
| 61 | WYSL | WILEYS TRANSPORT AND LOGISTICS INC | | | SCAC4 |
| 62 | WYSN | WYSON, E J TRUCKING INC | | | SCAC4 |
| 63 | WYSP | WAYSIDE TRANS CORP | | | SCAC4 |
| 64 | WYT | 2 Sqn, No 1 Elementary Flying Training School | Callsign: Wyton, | GB | AVCODES |
| 65 | WYT | No 1 Elementary Flying Training School | | | ICAO1 |
| 66 | WYT | Wyandotte Terminal R.R. Co. | 1/1975-1/1980; eliminated 10/1981 | | NAKINA |
| 67 | WYT | Wyandotte Terminal R.R. Co. | 1/75-1/80; eliminated 10/81 | | NRHS |
| 68 | WYT | WYANDOTTE TERMINAL RAILROAD CO. | | | PWRC |
| 69 | WYTC | WYMORE TRANSFER CO INC | | | SCAC4 |
| 70 | WYTF | WYATT TRANSFER INC | | | SCAC4 |
| 71 | WYTK | WEATHERBY TRUCKING LLC | | | SCAC4 |
| 72 | WYTP | WILEY TRANSPORTATION INC | | | SCAC4 |
| 73 | WYXS | WYNDMONT EXPRESS INC | | | SCAC4 |
| 74 | WYYU | TEMC CO.,LTD. | | ROK | BIC |
