| 1 | WHR | Hummingbird Helicopter Service, LLC | Callsign: Whirleybird, | USA | AVCODES |
| 2 | WHR | Hummingbird Aviation, LLC | Callsign: Tangi, | USA | AVCODES |
| 3 | WHR | Hummingbird Helicopter Service | | | ICAO1 |
| 4 | WHR | Welsh Highland Railway | | GB | TRAFFIC |
| 5 | WHRC | Windsor & Hantsport Ry. Co., Ltd. | added 7/1994; 7/2000-7/2005; eliminated 4/2008 | | NAKINA |
| 6 | WHRC | Windsor & Hantsport Ry. Co., Ltd. | added 7/94; 7/2000 | | NRHS |
| 7 | WHRC | WINDSOR & HANTSPORT RAILWAY COMPANY, LTD. | | | PWRC |
| 8 | WHRC | Windsor and Hantsport Railway | | | RSRV |
| 9 | WHRC | WINDSOR & HANTSPORT RAILWAY CO | | | SCAC4 |
| 10 | WHRK | W H TRUCKING OF NC INC | | | SCAC4 |
| 11 | WHRS | WHITEHALL ROWING AND SAIL | | | SCAC4 |
| 12 | WHRT | WHEELER TRANSPORT LTD | | | SCAC4 |
| 13 | WHRV | WILKENING, HARV TRANSPORT LTD | | | SCAC4 |
| 14 | WHRX | CREATIVE CHARTERS, INC. | | | PWRC |
