Airline codes! IATA! ICAO! Airline! Call sign! Country! Comments| H4 | | Héli Sécurité Helicopter Airlines | | France | |
| EO | ALX | Hewa Bora Airways | ALLCONGO | Democratic Republic of the Congo | |
| AHT | HTA Helicopteros | HELIAPRA | Portugal | |
| ETI | H-Bird Aviation Services AB | JETHAWK | Sweden | |
| HSN | H.S.AVIATION CO., LTD. | H.S.AVIATION | Thailand | |
| HAY | Hamburg Airways | HAMBURG AIRWAYS | Germany | defunct |
| HCK | Heli-Charter | HELI-CHARTER | United Kingdom | |
| HTB | Helix-Craft Aviation | HELIX-CRAFT | Panama | 2014[1] |
| HAF | Hellenic Air Force | HELLENIC AIR FORCE | Greece | |
| HRN | Heron Luftfahrt | HERONAIR | Germany | |
| HYP | Hyperion Aviation | HYPERION | Malta | |
| HFM | Hi Fly Malta | MOONRAKER | Malta | |
| A5 | HOP | Hop! | AIR HOP | France | |
| HLA | HC Airlines | HEAVYLIFT | United Kingdom | |
| HWD | HPM Investments | FLITEWISE | United Kingdom | |
| KTR | HT Helikoptertransport | COPTER TRANS | Sweden | |
| | Hacienda Airlines | | United States | defunct - 1957 to July 10, 1962 |
| FMS | Hadison Aviation | HADI | United States | |
| H6 | HAG | Hageland Aviation Services | HAGELAND | United States | |
| POW | Hagondale Limited | AIRNET | United Kingdom | |
| HR | HHN | Hahn Air | ROOSTER | Germany | |
| H1 | | Hahn Air Systems | | Germany | |
| HU | CHH | Hainan Airlines | HAINAN | China | |
| 1R | | Hainan Phoenix Information Systems | | China | |
| HLS | Haiti Air Freight | | Haiti | |
| 2T | HAM | Haiti Ambassador Airlines | | Haiti | |
| HTI | Haiti International Air | HAITI INTERNATIONAL | Haiti | |
| HRB | Haiti International Airline | HAITI AIRLINE | Haiti | |
| HNR | Haiti National Airlines (HANA) | HANAIR | Haiti | |
| HTN | Haiti North Airline | | Haiti | |
| HTC | Haiti Trans Air | HAITI TRANSAIR | Haiti | |
| HBC | Haitian Aviation Line | HALISA | Haiti | |
| HAJ | Hajvairy Airlines | HAJVAIRY | Pakistan | |
| HKL | Hak Air | HAK AIRLINE | Nigeria | |
| HLH | Hala Air | HALA AIR | Sudan | |
| HCV | Halcyonair | CREOLE | Cape Verde | |
| 4R | HHI | Hamburg International | HAMBURG JET | Germany | |
| HJL | Hamlin Jet | BIZJET | United Kingdom | |
| HMM | Hamra Air | HAMRA | United Arab Emirates | |
| WVA | Hand D Aviation | WABASH VALLEY | United States | |
| HGR | Hangar 8 | HANG | United Kingdom | |
| HGD | Hangard Aviation | HANGARD | Mongolia | |
| HAN | Hansung Airlines | HANSUNG AIR | Republic of Korea | |
| X3 | HLX | Hapag-Lloyd Express | YELLOW CAB | Germany | Became TUI fly Deutschland in 2007 |
| HF | HLF | Hapagfly | HAPAG LLOYD | Germany | Became TUI fly Deutschland in 2007 |
| HB | HAR | Harbor Airlines | HARBOR | United States | |
| HQ | HMY | Harmony Airways | HARMONY | Canada | |
| NBR | Haughey Air | NORBROOK | United Kingdom | |
| PYN | Haverfordwest Air Charter Services | POYSTON | United Kingdom | |
| HAV | Havilah Air Services | HAVILAH | Nigeria | |
| HA | HAL | Hawaiian Airlines | HAWAIIAN | United States | |
| HP | | Hawaiian Pacific Airlines | | United States | defunct |
| HKR | Hawk Air | AIR HAW | Argentina | |
| HMX | Hawk De Mexico | HAWK MEXICO | Mexico | |
| BH | | Hawkair | | Canada | defunct since 2016 |
| HKI | Hawkaire | HAWKEYE | United States | |
| HZL | Hazelton Airlines | HAZELTON | Australia | Defunct. |
| HN | HVY | Heavylift Cargo Airlines | HEAVY CARGO | Australia | |
| HVL | Heavylift International | HEAVYLIFT INTERNATIONAL | United Arab Emirates | |
| NS | HBH | Hebei Airlines | HEBEI AIR | China | |
| HDC | Helcopteros De Cataluna | HELICATALUNA | Spain | |
| HCB | Helenair (Barbados) | HELEN | Barbados | |
| HCL | Helenair Corporation | HELENCORP | Saint Lucia | |
| HHP | Helenia Helicopter Service | HELENIA | Denmark | |
| HLR | Heli Air Services | HELI BULGARIA | Bulgaria | |
| ALJ | Heli Ambulance Team | ALPIN HELI | Austria | |
| HEB | Heli Bernina | HELIBERNINA | Switzerland | |
| HFR | Heli France | HELIFRANCE | France | |
| HYH | Heli Hungary | HELIHUNGARY | Hungary | |
| HLM | Heli Medwest De Mexico | HELIMIDWEST | Mexico | |
| HLI | Heli Securite | HELI SAINT-TROPEZ | France | |
| HTP | Heli Trip | HELI TRIP | Mexico | |
| HLU | Heli Union Heli Prestations | HELI UNION | France | |
| MCM | Heli-Air-Monaco | HELI AIR | Monaco | |
| HHE | Heli-Holland | HELI HOLLAND | Netherlands | |
| HRA | Heli-Iberica | ERICA | Spain | |
| HIF | Heli-Iberica Fotogrametria | HIFSA | Spain | |
| HIG | Heli-Inter Guyane | INTER GUYANNE | France | |
| HLK | Heli-Link | HELI-LINK | Switzerland | |
| HMC | Heliamerica De Mexico | HELIAMERICA | Mexico | |
| HEA | Heliavia-Transporte Aéreo | HELIAVIA | Portugal | |
| CDY | Heliaviation Limited | CADDY | United Kingdom | |
| HIB | Helibravo Aviacao | HELIBRAVO | Portugal | |
| HLC | Helicap | HELICAP | France | |
| COV | Helicentre Coventry | HELICENTRE | United Kingdom | |
| HEL | Helicol | HELICOL | Colombia | |
| HCP | Helicopter | HELI CZECH | Czech Republic | |
| JKY | Helicopter & Aviation Services | JOCKEY | United Kingdom | |
| MVK | Helicopter Training & Hire | MAVRIK | United Kingdom | |
| HAP | Helicopteros Aero Personal | HELIPERSONAL | Mexico | |
| HAA | Helicopteros Agroforestal | AGROFORESTAL | Chile | |
| HNT | Helicopteros Internacionales | HELICOP INTER | Mexico | |
| HEN | Helicópteros Y Vehículos Nacionales Aéreos | HELINAC | Mexico | |
| HHH | Helicsa | HELICSA | Spain | |
| JB | JBA | Helijet | HELIJET | Canada | |
| HDR | Helikopterdrift | HELIDRIFT | Norway | |
| SCO | Helikopterservice Euro Air | SWEDCOPTER | Sweden | |
| OCE | Heliocean | HELIOCEAN | France | |
| ZU | HCY | Helios Airways | HELIOS | Cyprus | defunct since 7 November 2006 |
| HLP | Helipistas | HELIPISTAS | Spain | |
| HPL | Heliportugal | HELIPORTUGAL | Portugal | |
| HEC | Heliservicio Campeche | HELICAMPECHE | Mexico | |
| HSU | Helisul | HELIS | Portugal | |
| HSI | Heliswiss | HELISWISS | Switzerland | |
| HLT | Helitafe | HELITAFE | Mexico | |
| HIT | Helitalia | HELITALIA | Italy | |
| OFA | Helitaxi Ofavi | OFAVI | Mexico | |
| HLT | Helitours | HELITOURS | Sri Lanka | |
| 9I | HTA | Helitrans | SCANBIRD | Norway | |
| HTS | Helitrans Air Service | HELITRANS | United States | |
| HLW | Heliworks | HELIWORKS | Chile | |
| HJ | HEJ | Hellas Jet | HELLAS JET | Greece | ceased operation in 2010 |
| HW | FHE | Hello | FLYHELLO | Switzerland | |
| HLG | Helog | HELOG | Switzerland | |
| 2L | OAW | Helvetic Airways | HELVETIC | Switzerland | |
| HMS | Hemus Air | HEMUS AIR | Bulgaria | |
| HAC | Henebury Aviation | | Australia | |
| SSH | Heritage Flight (Valley Air Services) | SNOWSHOE | United States | |
| MRX | Herman's Markair Express | SPEEDMARK | United States | |
| HED | Heritage Aviation Developments | FLAPJACK | United Kingdom | |
| UD | HER | Hex'Air | HEX AIRLINE | France | |
| HHS | Hi-Jet Helicopter Services | HIJET | Suriname | |
| 5K | HFY | Hi Fly | SKY FLYER | Portugal | |
| HLB | High-Line Airways | HIGH-LINE | Canada | |
| HWY | Highland Airways | HIWAY | United Kingdom | |
| H9 | HIM | Himalaya Airlines | HIMALAYA | Nepal | |
| H7 | HYM | HiSky | SKY MOLDOVA | Moldova | |
| H4 | HYS | HiSky Europe | SKY EUROPE | Romania | |
| HSH | Hispánica de Aviación | HASA | Spain | |
| HIS | Hispaniola Airways | HISPANIOLA | Dominican Republic | |
| VM | VMS | His Majesty King Maha Vajiralongkorn | VICTOR MIKE[2] | Thailand | holding airline, renamed on his accession[3] |
| HGA | Hogan Air | HOGAN AIR | United States | |
| NTH | Hokkaido Air System | NORTH AIR | Japan | |
| ABH | Hokuriki-Koukuu Company | | Japan | |
| H5 | HOA | Hola Airlines | HOLA | Spain | |
| HIN | Holding International Group | HOLDING GROUP | Mexico | |
| HOL | Holiday Airlines (US Airline) | HOLIDAY | United States | |
| HC | HCC | Holidays Czech Airlines | CZECH HOLIDAYS | Czech Republic | |
| HTR | Holstenair Lubeck | HOLSTEN | Germany | |
| HMV | Homac Aviation | HOMAC | Luxembourg | |
| HAS | Honduras Airlines | HONDURAS AIR | Honduras | |
| HX | CRK | Hong Kong Airlines | BAUHINIA | Hong Kong | |
| RH | HKC | Hong Kong Air Cargo | MASCOT | Hong Kong | |
| UO | HKE | Hong Kong Express Airways | HONGKONG SHUTTLE | Hong Kong | |
| A6 | HTU | Hongtu Airlines | HONGLAND | China | |
| HEX | Honiara Cargo Express | HONIARA CARGO | Solomon Islands | |
| H1 | | Hooters Air | Hooters Air | United States | The airline was established in 2003 and started operations on March 6, 2003. On April 17, 2006, Hooters Air ceased operations, halting scheduled Public Charter service and refunding tickets. |
| HPJ | Hop-A-Jet | HOPA-JET | United States | |
| HH | | Hope Air | HOPE AIR | Canada | |
| QX | QXE | Horizon Air | HORIZON AIR | United States | |
| KOK | Horizon Air Service | KOKO | United States | |
| HSM | Horizon Air for Transport and Training | ALOFUKAIR | Libya | |
| HOR | Horizon Air-Taxi | HORIZON | Switzerland | |
| BN | HZA | Horizon Airlines | HORIZON | Australia | defunct |
| HPS | Horizon Plus | HORIZON PLUS | Bangladesh | |
| HUD | Horizons Unlimited | HUD | United States | |
| HOZ | Horizontes Aéreos | HORIZONTES AEREOS | Mexico | |
| HDI | Hoteles Dinamicos | DINAMICOS | Mexico | |
| HHO | Houston Helicopters | HOUSTON HELI | United States | |
| GGV | Houston Jet Services | GREGG AIR | Austria | |
| OZU | Hozu-Avia | HOZAVIA | Kazakhstan | |
| HUB | Hub Airlines | HUB | United States | |
| HUS | Huessler Air Service | HUESSLER | United States | |
| GMH | Hughes Aircraft Company | HUGHES EXPRESS | United States | |
| HJ | USW | HumoAir | AKSAR | Uzbekistan | |
| HUV | Hunair Hungarian Airlines | SILVER EAGLE | Hungary | |
| HUF | Hungarian Air Force | HUNGARIAN AIRFORCE | Hungary | |
| HW | UBD | FlyErbil | HAWLER | Iraqi Kurdistan | |
| HYA | Hyack Air | HYACK | Canada | |
| HYC | Hydro Air Flight Operations | HYDRO CARGO | South Africa | |
| HYD | Hydro-Québec | HYDRO | Canada | |
| HKB | Hawker Beechcraft | CLASSIC | United States | |
| MR | MML | Hunnu Air | TRANS MONGOLIA | Mongolia | |
| RPX | HD Air Ltd | RAPEX | United Kingdom | |
| SRD | HM Coastguard | COASTGUARD | United Kingdom | |
| SRG | HM Coastguard | RESCUE | United Kingdom | Search and Rescue |
| WHR | Hummingbird Helicopter Service | WHIRLEYBIRD | United States | |
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