| 1 | HG | Haiti International Airline | ICAO: HRB, Callsign: Haiti Airline, IATA Prefix: 138, | RH | AVCODES |
| 2 | HG | Florida West Airlines | ICAO: FWL, Callsign: Flo West, Name changed to Florida West International Airways, Inc. | USA | AVCODES |
| 3 | HG | Centreline Air Services Ltd. | | GB | AVCODES |
| 4 | HG | Hunting Surveys Ltd. | Callsign: Hunting, | GB | AVCODES |
| 5 | HG | Aero Lloyd Austria Luftfahrt GmbH | ICAO: AYP, Callsign: Austria Lloyd, Name changed to flyniki / NL Luftfahrt GmbH | A | AVCODES |
| 6 | HG | flyniki / NL Luftfahrt GmbH | ICAO: AYP, Callsign: flyniki, ICAO designator changed to NLY. Name changed from Aero Lloyd Austria Luftfahrtb GmbH | A | AVCODES |
| 7 | 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 |
| 8 | 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 |
| 9 | HG | Hala Air | ICAO: HTP, Callsign: Hala Express, IATA Designator changed from HY*. | LAR | AVCODES |
| 10 | HGA | Hogan Air | Callsign: Hogan Air, | USA | AVCODES |
| 11 | HGA | Hogan Air | | | ICAO1 |
| 12 | HGAA | HAINES MFG CO INC | | | SCAC4 |
| 13 | HGAH | HORNING, ANTHONY | | | SCAC4 |
| 14 | HGAL | HEADBONES GALLERY | | | SCAC4 |
| 15 | HGAR | HANA GARCIA, JESUS GABRIEL | | | SCAC4 |
| 16 | HGAS | HYDRA DYNE TECHNOLOGY INC | | | SCAC4 |
| 17 | HGAU | HYBAS INTERNATIONAL LLC | | USA | BIC |
| 18 | HGAU | Hybas International | | | RSRV |
| 19 | HGAU | HYBAS INTERNATIONAL LLC | | | SCAC4 |
| 20 | HGB | Greater Bay Airlines Company Limited | IATA: HB, Callsign: Great Bay, | PRC | AVCODES |
| 21 | HGB | Hessische Güterbahn GmbH | Buseck | D | privat-bahn.de |
| 22 | HGB | Hessische Güterbahn GmbH | | D | TRAFFIC |
| 23 | HGB | Hessische Güterbahn GmbH | | DE | VKM |
| 24 | HGBAU | Hering Gleisbau GhmbH | | DE | VKM |
| 25 | HGBB | HOGAN, B B TRUCKING CO INC | | | SCAC4 |
| 26 | HGBE | HIGHLAND EXPRESS INC | | | SCAC4 |
| 27 | HGBK | HIGGINBOTHAM TRUCKING LTD | | | SCAC4 |
| 28 | HGBR | HUGGI BARE EXPRESS INC | | | SCAC4 |
| 29 | HGBT | HIGGINS, BRENT TRUCKING CO INC | | | SCAC4 |
| 30 | HGBU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 31 | HGBU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 32 | HGCA | HGC | | | SCAC4 |
| 33 | HGCC | HUBBERTS PROCESSING AND SALES LIMIT | | | SCAC4 |
| 34 | HGCD | HGC LOGISTICS LTD | | | SCAC4 |
| 35 | HGCL | HARLENS TRUCKING LTD | | | SCAC4 |
| 36 | HGCN | HOLT GAS CO INC | | | SCAC4 |
| 37 | HGCQ | HODGE TRUCKING CO INC | | | SCAC4 |
| 38 | HGCS | HUDSON, G C SUPPLY LIMITED | | | SCAC4 |
| 39 | HGCT | HAGGAN JR, C EXCAVATION | | | SCAC4 |
| 40 | HGCU | THE GAS COMPANY LLC D.B.A. HAWAII GAS | | USA | BIC |
| 41 | HGCX | Southeastern Industrial Enterprises, Inc. | eliminated 10/2006 | | NAKINA |
| 42 | HGCX | Hillsboro Glass Co. | added 4/1974; 1/1975-1/1980; eliminated 10/1991 | | NAKINA |
| 43 | HGCX | Home Gas Corp. | 1/1945-4/1961; eliminated 1/1962 | | NAKINA |
| 44 | HGCX | Home Gas Corp. of Great Barrington | added 1/1962 | | NAKINA |
| 45 | HGCX | Home Gas Corp. | 1/52-4/61; eliminated 1/62 | | NRHS |
| 46 | HGCX | Home Gas Corp. of Great Barrington | added 1/62 | | NRHS |
| 47 | HGCX | Hillsboro Glass Co. | added 4/74; 1/75-1/80; eliminated 10/91 | | NRHS |
| 48 | HGCX | *HOME GAS CORP. OF GREAT BARRINGTON | | | PWRC |
| 49 | HGCX | *RETIRED 01-06-92 ATP (1255) [HILLSBORO GLASS CO.] | | | PWRC |
| 50 | HGCX | *SOUTHEASTERN INDUSTRIAL ENTERPRISES | | | PWRC |
| 51 | HGCX | Hillsboro Glass | | | RSRV |
| 52 | HGD | Hangard Aviation Ltd. | Callsign: Hangard, | MGL | AVCODES |
| 53 | HGD | Korea Aerospace University | Callsign: Hangdae, | ROK | AVCODES |
| 54 | HGD | Hangard Aviation | | | ICAO1 |
| 55 | HGDO | HUNTERS TRUCKING | | | SCAC4 |
| 56 | HGDP | HELENIC ANGEL SHIPPING INC | | | SCAC4 |
| 57 | HGDQ | HUGO TRUCKING LLC | | | SCAC4 |
| 58 | HGDU | HANGZHOU GREENDA ELECTRONIC MATERIALS CO., LTD. | | PRC | BIC |
| 59 | HGDU | HANGZHOU GREENDA CHEMICAL CL LTD | | | SCAC4 |
| 60 | HGDW | HIGGINS, DEWAYNE TRUCKING | | | SCAC4 |
| 61 | HGE | Martins Famous Pastry Shoppe, LLC | Callsign: Hoagie, | USA | AVCODES |
| 62 | HGEA | HI-GEAR EXPRESS | | | SCAC4 |
| 63 | HGEC | HIGHWAYS & SKYWAYS OF NC INC | | | SCAC4 |
| 64 | HGED | HUEBEL GRAPES ESTATES LTD | | | SCAC4 |
| 65 | HGEL | HAGEN, LOWELL C TRUCKING | | | SCAC4 |
| 66 | HGEM | HERNADEZ GUZMAN, EDILBERTO | | | SCAC4 |
| 67 | HGEN | HAGENHOFF TRANSPORTATION CO | | | SCAC4 |
| 68 | HGEO | HORST, G E TRANSPORT | | | SCAC4 |
| 69 | HGEQ | HAGENHOFF, CLEM TRUCKING INC | | | SCAC4 |
| 70 | HGET | HERITAGE TRANSPORT LLC | | | SCAC4 |
| 71 | HGF | Hungarian Ground Forces | | H | TRAFFIC |
| 72 | HGFL | HARGREAVES FARMS LTD | | | SCAC4 |
| 73 | HGFR | HUNTS, INGRID FINE ART | | | SCAC4 |
| 74 | HGFS | HERITAGE FS INC | | | SCAC4 |
| 75 | HGFU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 76 | HGFU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 77 | HGFX | Northern Refrigerator Line, Inc. | 1/1950-7/1954; eliminated 1/1955 | | NAKINA |
| 78 | HGFX | Northern Refrigerator Line, Inc. | Jan-52 | | NRHS |
| 79 | HGG | Hi Air Co., Ltd. | IATA: 4H, Callsign: Hi Air, | ROK | AVCODES |
| 80 | HGGI | HIGGINS, J E LUMBER COMPANY | | | SCAC4 |
| 81 | HGGL | HOUR GLASS GLOBAL LOGISTICS INC | | | SCAC4 |
| 82 | HGGN | HIGGINS TRANSPORT INC | | | SCAC4 |
| 83 | HGGT | HGG TRANSPORTACIONES S A DE C V | | | SCAC4 |
| 84 | HGGY | HIGGINS, GARY | | | SCAC4 |
| 85 | HGH | Atlantic Air Lift | | | ICAO1 |
| 86 | HGHA | HIGH ADVENTURE AIR | | | SCAC4 |
| 87 | HGHE | HIGHSEAS AGENCY LTD | | | SCAC4 |
| 88 | HGHI | HIGH QUALITY TRUCKING INC | | | SCAC4 |
| 89 | HGHN | HUGHES INTERNATIONAL LLC | | | SCAC4 |
| 90 | HGHO | HGH GRANITE INC | | | SCAC4 |
| 91 | HGHQ | HUGHES RELOCATION SERVICES INC | | | SCAC4 |
| 92 | HGHR | HIGHWAY STAR TRUCKING LTD | | | SCAC4 |
| 93 | HGHT | HUGHES TRANSPORT INC | | | SCAC4 |
| 94 | HGHU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 95 | HGHU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 96 | HGIQ | HET GROUP INC | | | SCAC4 |
| 97 | HGIT | HORST TRUCKING | | | SCAC4 |
| 98 | HGIU | HUB GROUP INC | | | SCAC4 |
| 99 | HGJA | HERNANDEZ GARZA, JAVIER | | | SCAC4 |
| 100 | HGJS | HERMOSILLO GONZALEZ, JESUS | | | SCAC4 |
