| 1 | HUD | Horizons Unlimited | Callsign: Hud, | USA | AVCODES |
| 2 | HUD | Air Hudik AB | Callsign: Air Hudik, | S | AVCODES |
| 3 | HUD | Horizons Unlimited | | | ICAO1 |
| 4 | HUDB | HUDSONS BAY COMPANY | | | SCAC4 |
| 5 | HUDC | HOUSTON DISTRIBUTING COMPANY INC | | | SCAC4 |
| 6 | HUDCB | | | GB | TRAFFIC |
| 7 | HUDCT | Huddersfield Corporation Transport | | GB | TRAFFIC |
| 8 | HUDG | HOUSTON, DOUG L | | | SCAC4 |
| 9 | HUDK | HUNTLAND TRUCKING | | | SCAC4 |
| 10 | HUDL | HUSKER DISTRIBUTION INC | | | SCAC4 |
| 11 | HUDM | HUDSON, GAY, MOVING AND STORAGE COM | | | SCAC4 |
| 12 | HUDMAN | Hudson & Manhattan | City: New York | USA | TRAFFIC |
| 13 | HUDN | HUDSON TRUCKING | | | SCAC4 |
| 14 | HUDR | HUDDLESTON, TROY TRUCKING LLC | | | SCAC4 |
| 15 | HUDS | HUDSON TRANSPORTATION CO INC | | | SCAC4 |
| 16 | HUDT | HUDINI TRANSPORTATION LTD | | | SCAC4 |
| 17 | HUDT | Hudson Transit | | US-NJ | TRAFFIC |
| 18 | HUDX | Hudson Technologies, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 19 | HUDX | Hudson Technologies, Inc. | Jul-00 | | NRHS |
| 20 | HUDX | HUDSON TECHNOLOGIES INC | | | PWRC |
| 21 | HUDX | Hudson Technologies | | | RSRV |
