| 1801 | HG | Haiti International Airline | ICAO: HRB, Callsign: Haiti Airline, IATA Prefix: 138, | RH | AVCODES |
| 1802 | HG | Florida West Airlines | ICAO: FWL, Callsign: Flo West, Name changed to Florida West International Airways, Inc. | USA | AVCODES |
| 1803 | HG | Centreline Air Services Ltd. | | GB | AVCODES |
| 1804 | HG | Hunting Surveys Ltd. | Callsign: Hunting, | GB | AVCODES |
| 1805 | HG | Aero Lloyd Austria Luftfahrt GmbH | ICAO: AYP, Callsign: Austria Lloyd, Name changed to flyniki / NL Luftfahrt GmbH | A | AVCODES |
| 1806 | HG | flyniki / NL Luftfahrt GmbH | ICAO: AYP, Callsign: flyniki, ICAO designator changed to NLY. Name changed from Aero Lloyd Austria Luftfahrtb GmbH | A | AVCODES |
| 1807 | HG | Niki Luftfahrt GmbH | ICAO: NLY, Callsign: flyniki, ICAO designator changed from AYP. Ceased operations on 14 December 2017. Name changed from Aero Lloyd Austria Luftfahrtb GmbH | A | AVCODES |
| 1808 | HG | Hibernian Airlines Limited | ICAO: HBN, Callsign: Finch, Wholly-owned by ILAI (Inversiones L�neas A�reas Internacionales), the parent of Air Nostrum. ACMI operator with CRJ-1000. | IRL | AVCODES |
| 1809 | HG | Hala Air | ICAO: HTP, Callsign: Hala Express, IATA Designator changed from HY*. | LAR | AVCODES |
| 1810 | HGA | Hogan Air | Callsign: Hogan Air, | USA | AVCODES |
| 1811 | HGA | Hogan Air | | | ICAO1 |
| 1812 | HGAA | HAINES MFG CO INC | | | SCAC4 |
| 1813 | HGAH | HORNING, ANTHONY | | | SCAC4 |
| 1814 | HGAL | HEADBONES GALLERY | | | SCAC4 |
| 1815 | HGAR | HANA GARCIA, JESUS GABRIEL | | | SCAC4 |
| 1816 | HGAS | HYDRA DYNE TECHNOLOGY INC | | | SCAC4 |
| 1817 | HGAU | HYBAS INTERNATIONAL LLC | | USA | BIC |
| 1818 | HGAU | Hybas International | | | RSRV |
| 1819 | HGAU | HYBAS INTERNATIONAL LLC | | | SCAC4 |
| 1820 | HGB | Greater Bay Airlines Company Limited | IATA: HB, Callsign: Great Bay, | PRC | AVCODES |
| 1821 | HGB | Hessische Güterbahn GmbH | Buseck | D | privat-bahn.de |
| 1822 | HGB | Hessische Güterbahn GmbH | | D | TRAFFIC |
| 1823 | HGB | Hessische Güterbahn GmbH | | DE | VKM |
| 1824 | HGBAU | Hering Gleisbau GhmbH | | DE | VKM |
| 1825 | HGBB | HOGAN, B B TRUCKING CO INC | | | SCAC4 |
| 1826 | HGBE | HIGHLAND EXPRESS INC | | | SCAC4 |
| 1827 | HGBK | HIGGINBOTHAM TRUCKING LTD | | | SCAC4 |
| 1828 | HGBR | HUGGI BARE EXPRESS INC | | | SCAC4 |
| 1829 | HGBT | HIGGINS, BRENT TRUCKING CO INC | | | SCAC4 |
| 1830 | HGBU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 1831 | HGBU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 1832 | HGCA | HGC | | | SCAC4 |
| 1833 | HGCC | HUBBERTS PROCESSING AND SALES LIMIT | | | SCAC4 |
| 1834 | HGCD | HGC LOGISTICS LTD | | | SCAC4 |
| 1835 | HGCL | HARLENS TRUCKING LTD | | | SCAC4 |
| 1836 | HGCN | HOLT GAS CO INC | | | SCAC4 |
| 1837 | HGCQ | HODGE TRUCKING CO INC | | | SCAC4 |
| 1838 | HGCS | HUDSON, G C SUPPLY LIMITED | | | SCAC4 |
| 1839 | HGCT | HAGGAN JR, C EXCAVATION | | | SCAC4 |
| 1840 | HGCU | THE GAS COMPANY LLC D.B.A. HAWAII GAS | | USA | BIC |
| 1841 | HGCX | Southeastern Industrial Enterprises, Inc. | eliminated 10/2006 | | NAKINA |
| 1842 | HGCX | Hillsboro Glass Co. | added 4/1974; 1/1975-1/1980; eliminated 10/1991 | | NAKINA |
| 1843 | HGCX | Home Gas Corp. | 1/1945-4/1961; eliminated 1/1962 | | NAKINA |
| 1844 | HGCX | Home Gas Corp. of Great Barrington | added 1/1962 | | NAKINA |
| 1845 | HGCX | Home Gas Corp. | 1/52-4/61; eliminated 1/62 | | NRHS |
| 1846 | HGCX | Home Gas Corp. of Great Barrington | added 1/62 | | NRHS |
| 1847 | HGCX | Hillsboro Glass Co. | added 4/74; 1/75-1/80; eliminated 10/91 | | NRHS |
| 1848 | HGCX | *HOME GAS CORP. OF GREAT BARRINGTON | | | PWRC |
| 1849 | HGCX | *RETIRED 01-06-92 ATP (1255) [HILLSBORO GLASS CO.] | | | PWRC |
| 1850 | HGCX | *SOUTHEASTERN INDUSTRIAL ENTERPRISES | | | PWRC |
| 1851 | HGCX | Hillsboro Glass | | | RSRV |
| 1852 | HGD | Hangard Aviation Ltd. | Callsign: Hangard, | MGL | AVCODES |
| 1853 | HGD | Korea Aerospace University | Callsign: Hangdae, | ROK | AVCODES |
| 1854 | HGD | Hangard Aviation | | | ICAO1 |
| 1855 | HGDO | HUNTERS TRUCKING | | | SCAC4 |
| 1856 | HGDP | HELENIC ANGEL SHIPPING INC | | | SCAC4 |
| 1857 | HGDQ | HUGO TRUCKING LLC | | | SCAC4 |
| 1858 | HGDU | HANGZHOU GREENDA ELECTRONIC MATERIALS CO., LTD. | | PRC | BIC |
| 1859 | HGDU | HANGZHOU GREENDA CHEMICAL CL LTD | | | SCAC4 |
| 1860 | HGDW | HIGGINS, DEWAYNE TRUCKING | | | SCAC4 |
| 1861 | HGE | Martins Famous Pastry Shoppe, LLC | Callsign: Hoagie, | USA | AVCODES |
| 1862 | HGEA | HI-GEAR EXPRESS | | | SCAC4 |
| 1863 | HGEC | HIGHWAYS & SKYWAYS OF NC INC | | | SCAC4 |
| 1864 | HGED | HUEBEL GRAPES ESTATES LTD | | | SCAC4 |
| 1865 | HGEL | HAGEN, LOWELL C TRUCKING | | | SCAC4 |
| 1866 | HGEM | HERNADEZ GUZMAN, EDILBERTO | | | SCAC4 |
| 1867 | HGEN | HAGENHOFF TRANSPORTATION CO | | | SCAC4 |
| 1868 | HGEO | HORST, G E TRANSPORT | | | SCAC4 |
| 1869 | HGEQ | HAGENHOFF, CLEM TRUCKING INC | | | SCAC4 |
| 1870 | HGET | HERITAGE TRANSPORT LLC | | | SCAC4 |
| 1871 | HGF | Hungarian Ground Forces | | H | TRAFFIC |
| 1872 | HGFL | HARGREAVES FARMS LTD | | | SCAC4 |
| 1873 | HGFR | HUNTS, INGRID FINE ART | | | SCAC4 |
| 1874 | HGFS | HERITAGE FS INC | | | SCAC4 |
| 1875 | HGFU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 1876 | HGFU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 1877 | HGFX | Northern Refrigerator Line, Inc. | 1/1950-7/1954; eliminated 1/1955 | | NAKINA |
| 1878 | HGFX | Northern Refrigerator Line, Inc. | Jan-52 | | NRHS |
| 1879 | HGG | Hi Air Co., Ltd. | IATA: 4H, Callsign: Hi Air, | ROK | AVCODES |
| 1880 | HGGI | HIGGINS, J E LUMBER COMPANY | | | SCAC4 |
| 1881 | HGGL | HOUR GLASS GLOBAL LOGISTICS INC | | | SCAC4 |
| 1882 | HGGN | HIGGINS TRANSPORT INC | | | SCAC4 |
| 1883 | HGGT | HGG TRANSPORTACIONES S A DE C V | | | SCAC4 |
| 1884 | HGGY | HIGGINS, GARY | | | SCAC4 |
| 1885 | HGH | Atlantic Air Lift | | | ICAO1 |
| 1886 | HGHA | HIGH ADVENTURE AIR | | | SCAC4 |
| 1887 | HGHE | HIGHSEAS AGENCY LTD | | | SCAC4 |
| 1888 | HGHI | HIGH QUALITY TRUCKING INC | | | SCAC4 |
| 1889 | HGHN | HUGHES INTERNATIONAL LLC | | | SCAC4 |
| 1890 | HGHO | HGH GRANITE INC | | | SCAC4 |
| 1891 | HGHQ | HUGHES RELOCATION SERVICES INC | | | SCAC4 |
| 1892 | HGHR | HIGHWAY STAR TRUCKING LTD | | | SCAC4 |
| 1893 | HGHT | HUGHES TRANSPORT INC | | | SCAC4 |
| 1894 | HGHU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 1895 | HGHU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 1896 | HGIQ | HET GROUP INC | | | SCAC4 |
| 1897 | HGIT | HORST TRUCKING | | | SCAC4 |
| 1898 | HGIU | HUB GROUP INC | | | SCAC4 |
| 1899 | HGJA | HERNANDEZ GARZA, JAVIER | | | SCAC4 |
| 1900 | HGJS | HERMOSILLO GONZALEZ, JESUS | | | SCAC4 |
