| 1 | HSI | Heliswiss, Schweizerische Helikopter AG | Callsign: Heliswiss, Name changed to Heliswiss International AG. | CH | AVCODES |
| 2 | HSI | Heliswiss International AG | Callsign: Heliswiss, Name changed to Swiss Helicopter AG. Name changed from Heliswiss, Schweizerische Helikopter AG. | CH | AVCODES |
| 3 | HSI | Swiss Helicopter AG | Callsign: Heliswiss, Name changed from Heliswiss International AG and previously from Heliswiss, Schweizerische Helikopter AG. | CH | AVCODES |
| 4 | HSI | Heliswiss | | | ICAO1 |
| 5 | HSIA | HEATH & SONS INC | | | SCAC4 |
| 6 | HSIJ | HANSA STARS INC | | | SCAC4 |
| 7 | HSIM | HIGHWAY STAR INC | | | SCAC4 |
| 8 | HSIN | Hanshin Electric Railway | | J | TRAFFIC |
| 9 | HSINHO | Hsinho Bus | City: Taipei | RC | TRAFFIC |
| 10 | HSIS | HICKENBOTTOM & SONS INC | | | SCAC4 |
| 11 | HSIT | HEIDEN STRINGED INSTRUMENTS | | | SCAC4 |
| 12 | HSIU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 13 | HSIU | SHANGHAI HOYER SINOBULK TRANSPORT C | | | SCAC4 |
| 14 | HSIX | Housing Starts Inc. | added 7/1995; eliminated 10/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 15 | HSIX | Housing Starts Inc. | added 7/95; eliminated 10/97; 7/2000 | | NRHS |
| 16 | HSIX | HOUSING STARTS INC. | | | PWRC |
| 17 | HSIX | Housing Starts Inc. | | | RSRV |
| 18 | HSIZ | HOLLY SUGAR INDUSTRY | | | PWRC |
