| 1 | HST | Hellenic Star Airways | IATA: HJ, Callsign: Hellenic Star, Ceased opertions in February 2002. | GR | AVCODES |
| 2 | HST | UAB Heston Airlines JSC | IATA: HN, Callsign: Heston, IATA Prefix code 680 recalled. | LT | AVCODES |
| 3 | HSTA | HS TOSCA SHIPPING COMPANY LTD | | | SCAC4 |
| 4 | HSTB | Historische Seethalbahn (instead of entry: VHS) | | CH | VKM |
| 5 | HSTC | HONE & SON TRUCKING CO | | | SCAC4 |
| 6 | HSTF | HOUSTON TRANSFER & STORAGE CO | | | SCAC4 |
| 7 | HSTG | HERNANDEZ & SON TRUCKING | | | SCAC4 |
| 8 | HSTH | HOIST & HAUL | | | SCAC4 |
| 9 | HSTI | HELLER & SONS TRANSPORTATION INC | | | SCAC4 |
| 10 | HSTJ | HANDY, SAM TRUCKING | | | SCAC4 |
| 11 | HSTP | H & S TRANSPORT | | | SCAC4 |
| 12 | HSTQ | H.S. TRUCKING | | | SCAC1 |
| 13 | HSTQ | HORSE SHOE TRANSPORTATION INC | | | SCAC4 |
| 14 | HSTR | HARRISON - SHIELDS TRANSPORTATION | | | PWRC |
| 15 | HSTU | MACS MARITIME CARRIER SHIPPING GMBH & CO | | D | BIC |
| 16 | HSTU | WASHBAY-LINIE GMBH | | | SCAC3 |
| 17 | HSTV | HOT SHOT THRILL RIDES INC | | | SCAC4 |
| 18 | HSTW | HESTER, E L TRUCKING INC | | | SCAC4 |
| 19 | HSTX | Strauss LLC | 7/2005 (not listed) | | NAKINA |
| 20 | HSTX | Hinckley & Schmitt | 1/1946-4/1961; eliminated 1/1965 | | NAKINA |
| 21 | HSTX | Hinckley & Schmitt | 1/52-4/61; eliminated 1/65 | | NRHS |
| 22 | HSTX | *HINKLEY & SCHMITT | | | PWRC |
| 23 | HSTX | +STRAUS LLC | | | PWRC |
| 24 | HSTX | STRAUSS LLC | | | SCAC4 |
| 25 | HSTZ | HERZOG STONE | | | PWRC |
