International airports, regional fields and GA aerodromes — the places every mission starts and ends.

| Company | Type | Location | Codes |
|---|---|---|---|
| Ogliuga Island Army Airfield (historical) | aerodrome | United States | — |
| Ogoki Post Airport | international | Canada | IATA YOG · ICAO CYKP |
| Ogorodnya Gomel'skaya | private airstrip | Belarus | — |
| O'Hare International Airport | international | Chicago, United States | IATA ORD · ICAO KORD |
| Ohariu Valley Airstrip | aerodrome | New Zealand | — |
| Ohaupo South Airfield | aerodrome | New Zealand | — |
| Ohinewai Airfield | aerodrome | New Zealand | — |
| Ohio County Airport | aerodrome | United States | — |
| Ohio Dusting Company Incorporated Airport | aerodrome | United States | — |
| Ohio State University Airport | international | United States | IATA OSU · ICAO KOSU |
| Ohkay Owingeh Airport | international |
aerodrome 30,878international 8,351military airfield 1,867private airstrip 1,800heliport 555regional 460
United States 15,232Brazil 2,982Australia 2,025Canada 1,765France 1,355Russia 1,265United Kingdom 1,109South Africa 938Germany 879Colombia 835Italy 718Indonesia 681Argentina 621Ukraine 570Papua New Guinea 536China 489Mexico 478Venezuela 468Spain 414India 411Namibia 376Chile 358Congo - Kinshasa 356South Sudan 331Poland 327Czechia 277New Zealand 250Kenya 242Sweden 222Japan 195Philippines 188Norway 179Botswana 151Portugal
Operators claiming an entry can correct facts, add services and certificates, and mark their page verified. Claiming is free — see a company’s page for the claim link.
| United States |
| IATA ESO |
| Ohlsenhagen Airstrip | aerodrome | Namibia | — |
| Ohman Ranch Airport | aerodrome | United States | — |
| Ohorongo Airstrip | aerodrome | Namibia | ICAO FYKQ |
| Ohrid St. Paul the Apostle International Airport | international | Ohrid, North Macedonia | IATA OHD · ICAO LWOH |
| Oian Airfield | aerodrome | Norway | ICAO ENMO |
| Oiapoque Airport | international | Brazil | IATA OYK · ICAO SBOI |
| Oicha | aerodrome | Congo - Kinshasa | — |
| Oilfields General Hospital CFL3 | aerodrome | Canada | ICAO CFL3 |
| Oil Trough Landing Strip | aerodrome | United States | — |
| Oita Airport | international | Japan | IATA OIT · ICAO RJFO |
| Oita-Kenou Airport | aerodrome | Japan | — |
| Ojhar Air Force Station | military airfield | India | IATA ISK · ICAO VAOZ |
| Ojibwa Airpark | aerodrome | United States | — |
| Ojika Airport | aerodrome | Japan | ICAO RJDO |
| Ojo del Agua | aerodrome | Guatemala | — |
| Okaba Airport | international | Indonesia | IATA OKQ · ICAO WAKO |
| Okahandja Airstrip | aerodrome | Namibia | ICAO FYON |
| Okahao Airfield | aerodrome | Namibia | ICAO FYOH |
| Okahirongo Elefant Lodge Airstrip | aerodrome | Namibia | ICAO FYHP |
| Okahirongo River Camp Airstrip | aerodrome | Namibia | ICAO FYIC |
| Okajo Safari Lodge Airstrip | aerodrome | Namibia | ICAO FYLO |
| Okakarara Airfield | aerodrome | Namibia | ICAO FYOK |
| Okamapu Airstrip | aerodrome | Namibia | ICAO FYMP |
| Okamatapati Airstrip | aerodrome | Namibia | — |
| Okanduka Ranch Airstrip | aerodrome | Namibia | — |
| Okanguati Airport | aerodrome | Namibia | ICAO FYKW |
| Okanogan Legion Airport | aerodrome | United States | — |
| Okao Airport | international | Papua New Guinea | IATA OKV · ICAO AYOF |
| Okapanje Airport | aerodrome | Namibia | — |
| Okaperuperu Airfield | aerodrome | Namibia | ICAO FYPR |
| Okarche Airport | aerodrome | United States | — |
| Ōkārito Aerodrome | private airstrip | New Zealand | — |
| Okarumuti Game Lodge Airstrip | aerodrome | Namibia | ICAO FYIT |
| Okaukuejo Airport | international | Namibia | IATA OKF · ICAO FYOO |
| Okayama Airport | international | Japan | IATA OKJ · ICAO RJOB |
| Okbap | aerodrome | Indonesia | ICAO WAVY |
| Okbape Airstrip | aerodrome | Indonesia | — |
| Okbem | aerodrome | Indonesia | ICAO WAZQ |
| O K Dies Airport | aerodrome | United States | — |