| 4701 | HSHM | HISTRIA SHIPMANAGEMENT SRL | | | SCAC4 |
| 4702 | HSHN | HARTSHORN OIL INC | | | SCAC4 |
| 4703 | HSHR | HARRIS, | | | SCAC4 |
| 4704 | HSHT | HOT SHOT TRUCKING LLC | | | SCAC4 |
| 4705 | HSI | Heliswiss, Schweizerische Helikopter AG | Callsign: Heliswiss, Name changed to Heliswiss International AG. | CH | AVCODES |
| 4706 | HSI | Heliswiss International AG | Callsign: Heliswiss, Name changed to Swiss Helicopter AG. Name changed from Heliswiss, Schweizerische Helikopter AG. | CH | AVCODES |
| 4707 | HSI | Swiss Helicopter AG | Callsign: Heliswiss, Name changed from Heliswiss International AG and previously from Heliswiss, Schweizerische Helikopter AG. | CH | AVCODES |
| 4708 | HSI | Heliswiss | | | ICAO1 |
| 4709 | HSIA | HEATH & SONS INC | | | SCAC4 |
| 4710 | HSIJ | HANSA STARS INC | | | SCAC4 |
| 4711 | HSIM | HIGHWAY STAR INC | | | SCAC4 |
| 4712 | HSIN | Hanshin Electric Railway | | J | TRAFFIC |
| 4713 | HSINHO | Hsinho Bus | City: Taipei | RC | TRAFFIC |
| 4714 | HSIS | HICKENBOTTOM & SONS INC | | | SCAC4 |
| 4715 | HSIT | HEIDEN STRINGED INSTRUMENTS | | | SCAC4 |
| 4716 | HSIU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 4717 | HSIU | SHANGHAI HOYER SINOBULK TRANSPORT C | | | SCAC4 |
| 4718 | HSIX | Housing Starts Inc. | added 7/1995; eliminated 10/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 4719 | HSIX | Housing Starts Inc. | added 7/95; eliminated 10/97; 7/2000 | | NRHS |
| 4720 | HSIX | HOUSING STARTS INC. | | | PWRC |
| 4721 | HSIX | Housing Starts Inc. | | | RSRV |
| 4722 | HSIZ | HOLLY SUGAR INDUSTRY | | | PWRC |
| 4723 | HSJ | Hebei Hongsheng Jet Co., Ltd | Callsign: Baosheng, | PRC | AVCODES |
| 4724 | HSJT | HUSS, JIM TRUCKING CO | | | SCAC4 |
| 4725 | HSK | Sky Europe Airlines Hungary | IATA: 5P, Callsign: Matra, Designator 5P recalled by IATA | H | AVCODES |
| 4726 | HSK | Sky Europe Airlines Hungary | Callsign: Matra, Designator 5P recalled by IATA | H | AVCODES |
| 4727 | HSK | Sky Europe Airlines | | | ICAO1 |
| 4728 | HSKA | HASKINS AUTO SALVAGE | | | SCAC4 |
| 4729 | HSKC | HUSKY MARKETING AND SUPPLY COMPANY | | | SCAC4 |
| 4730 | HSKH | HUSKY HAULERS INC | | | SCAC4 |
| 4731 | HSKI | HIRATAS TRUCKING | | | SCAC4 |
| 4732 | HSKK | HUSKY EXPEDITERS INC | | | SCAC4 |
| 4733 | HSKM | HUSKY ENERGY MARKETING INC | | | SCAC4 |
| 4734 | HSKN | HARRIS TRUCKING | | | SCAC4 |
| 4735 | HSKO | HOSKINS OIL CO LLC | | | SCAC4 |
| 4736 | HSKR | HOOSIER TRUCK BROKERS LLC | | | SCAC4 |
| 4737 | HSKT | HUSKY TRANSPORT INC | | | SCAC4 |
| 4738 | HSKU | HAFSKIP LTD LINE | | | SCAC4 |
| 4739 | HSKW | HARRIS TRUCKING | | | SCAC4 |
| 4740 | HSKX | HUSKY OIL OPERATIONS LTD. | | | PWRC |
| 4741 | HSKX | HUSKY OIL OPERATIONS LIMITED | | | SCAC4 |
| 4742 | HSKY | HUSKY FARM EQUIPMENT LIMITED | | | SCAC4 |
| 4743 | HSL | Hispania Lineas Aereas, S.L. | Callsign: Hispania, | E | AVCODES |
| 4744 | HSL | Hispania, S.A. | IATA: HH, Ceased operations on 15 July 1989. IATA designator changed from XX | E | AVCODES |
| 4745 | HSL | Vladivostock Air | IATA: XF, ICAO designator changed to VLK | RUS | AVCODES |
| 4746 | HSL | Hispania, S.A. | IATA: XF, IATA designator changed to HH | E | AVCODES |
| 4747 | HSL | Hispania Lineas Aereas, S.L. | IATA: HI, Callsign: Hotel India, IATA designator changed to XF. | E | AVCODES |
| 4748 | HSL | Helisirio SRL | Callsign: Helisirio, | I | AVCODES |
| 4749 | HSL | HSL-Logistik GmbH | Hamburg | D | privat-bahn.de |
| 4750 | HSL | HSL Logistik GmbH | | D | TRAFFIC |
| 4751 | HSL | HSL Logistik GmbH | | DE | VKM |
| 4752 | HSLB | HESTER LOGISTICS LLC | | | SCAC4 |
| 4753 | HSLC | HANSA LINIE CO | | | SCAC4 |
| 4754 | HSLD | HOSELTON STUDIO LIMITED | | | SCAC4 |
| 4755 | HSLE | HUDSON SHIPPING LINES INC | | | SCAC4 |
| 4756 | HSLF | H & STL LLC | | | SCAC4 |
| 4757 | HSLN | HOWE SHIPPING LIMITED | | | SCAC4 |
| 4758 | HSLO | HASSEL, TOM TRANSPORT INC | | | SCAC4 |
| 4759 | HSLQ | H & S LOGISTICS VENTURES LLC | | | SCAC4 |
| 4760 | HSLU | HAULAGE SERVICES, LTD. | | | PWRC |
| 4761 | HSLU | Haulage Services | | | RSRV |
| 4762 | HSLU | HUISMAN SPECIAL LIFTING EQUIPMENT B | | | SCAC4 |
| 4763 | HSLV | HABA SPED LTD | | | SCAC4 |
| 4764 | HSM | Helicopter Service MTTE | Callsign: Lifestar, | D | AVCODES |
| 4765 | HSM | Helicopter Services Malta Limited | Callsign: Helimalt, | M | AVCODES |
| 4766 | HSM | Horizon Air for Transport and Training | | | ICAO1 |
| 4767 | HSM | Dutch Iron Railway Company | | NL | TRAFFIC |
| 4768 | HSMA | HARMONIA SHIPPING MANAGEMENT INC | | | SCAC4 |
| 4769 | HSMC | HOLLANDER INTERNATIONAL STORAGE AND | | | SCAC4 |
| 4770 | HSMG | HANDLING SPECIALTY MANUFACTURING LI | | | SCAC4 |
| 4771 | HSMI | HEWITT, S M (SARNIA) LTD | | | SCAC4 |
| 4772 | HSMN | HOLLYWOOD & SPORTS MEMORABILIA INC | | | SCAC4 |
| 4773 | HSMX | Housmex, Inc. | added 1/1986; eliminated 7/1992; 1/1994 (not listed) | | NAKINA |
| 4774 | HSMX | Housmex, Inc. | added 1/86; eliminated 7/92; 1/94 | | NRHS |
| 4775 | HSMX | *HESSEN STEAM MUSEUM | | | PWRC |
| 4776 | HSMX | *HOUSMEX, INC. | | | PWRC |
| 4777 | HSN | Southern Air Ltd. | Callsign: Heli Southern, | GB | AVCODES |
| 4778 | HSN | H.S. Aviation Co. Ltd | IATA: HP, Callsign: Jaguar, | T | AVCODES |
| 4779 | HSNA | HOSANNA ENTERPRISES | | | SCAC4 |
| 4780 | HSNB | HANSON, MAX B | | | SCAC4 |
| 4781 | HSNE | HANSENS BEVERAGE COMPANY | | | SCAC4 |
| 4782 | HSNG | HODSONS TRUCKING | | | SCAC4 |
| 4783 | HSNI | HARRISON-NICHOLS CO LTD | | | SCAC4 |
| 4784 | HSNK | HOUSTON TRUCKING | | | SCAC4 |
| 4785 | HSNL | HAISTON OIL CO | | | SCAC4 |
| 4786 | HSNM | H & M TRUCKING INC | | | SCAC4 |
| 4787 | HSNP | HOUSTON SHIPPING INC. | | | SCAC4 |
| 4788 | HSNR | HANSON TRUCKING | | | SCAC4 |
| 4789 | HSNU | HYOSUNG CORPORATION | | | SCAC4 |
| 4790 | HSO | Compania Helicopteros de Transporte, S.A. | Callsign: Heliasturias, | E | AVCODES |
| 4791 | HSO | Heli Service International GmbH | Callsign: Heliservice, | D | AVCODES |
| 4792 | HSO | Campania Helicopteros De Transporte | | | ICAO1 |
| 4793 | HSOC | HOSCO INC | | | SCAC4 |
| 4794 | HSOD | HELLER & SONS DISTRIBUTING INC | | | SCAC4 |
| 4795 | HSOF | HENGSOFT | | | SCAC4 |
| 4796 | HSOI | HAYS & SON OIL CO INC | | | SCAC4 |
| 4797 | HSOL | H & S OIL COMPANY INC | | | SCAC4 |
| 4798 | HSOR | Hisatsu Orange Railway | | J | TRAFFIC |
| 4799 | HSP | International Jet charter, Inc. d/b/a The Flying Hospital | Callsign: Hospital, | USA | AVCODES |
| 4800 | HSP | | | | ICAO1 |
