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

| Company | Type | Location | Codes |
|---|---|---|---|
| Old Vredendal Airfield | aerodrome | South Africa | — |
| Old Warden Airfield | aerodrome | United Kingdom | ICAO EGTH |
| Oleksandriia | aerodrome | Ukraine | ICAO UKKY |
| Oleksandriya Helicopter Base | heliport | Ukraine | ICAO UKBA |
| Oleksiivka | aerodrome | Ukraine | — |
| Oleleren Airport | aerodrome | Kenya | — |
| Olenivka | aerodrome | Ukraine | — |
| Olenya air base | military airfield | Russia | ICAO XLMO |
| Olenyok Airport | international | Russia | IATA ONK · ICAO UERO |
| Oleo Airport | aerodrome | United States | — |
| Olerai Airport | aerodrome | Kenya | — |
| Olfert Airport | aerodrome | United States | — |
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.
| Olga Bay Seaplane Base | international | United States | IATA KOY |
| Olga Maria | aerodrome | Guatemala | — |
| Ölgii Airport | international | Mongolia | IATA ULG · ICAO ZMUL |
| Ol'ginskaya Airfield | aerodrome | Russia | — |
| Olginskaya Airstrip | aerodrome | Russia | — |
| Ølgod/Vallund | aerodrome | Denmark | — |
| Olhos D`água Airport | international | Brazil | IATA GGB · ICAO SWHP |
| Oliair Airport | aerodrome | United States | — |
| Olifants Airstrip | aerodrome | South Africa | — |
| Olifantsdrif Airstrip (CLOSED) | aerodrome | South Africa | — |
| Olifants Nature Reserve Airstrip | aerodrome | South Africa | — |
| Olifants North 2 Airstrip (CLOSED) | aerodrome | South Africa | — |
| Olifants River Bridge Landing Strip | aerodrome | South Africa | — |
| Olifantwater West Landing Site | aerodrome | Namibia | — |
| Oliktok Long Range Radar Site Airport | aerodrome | United States | ICAO POLI |
| Olimboi Airfield | aerodrome | Greece | — |
| Olinger Strip | private airstrip | United States | — |
| Olive Branch Airport | international | United States | IATA OLV · ICAO KOLV |
| Oliveira | aerodrome | Brazil | — |
| Oliver Airport (Historic) | aerodrome | United States | — |
| Oliver Lake Airport | aerodrome | United States | — |
| Oliver Lake Seaplane Base | aerodrome | United States | — |
| Oliver Landing Airport | aerodrome | United States | — |
| Oliver Municipal Airport | aerodrome | Canada | — |
| Oliver Springs Airport | aerodrome | Oliver Springs, United States | — |
| Olivia Regional Airport | aerodrome | United States | ICAO KOVL |
| Oljogi Ranch Airport | aerodrome | Kenya | — |
| Olkhovatka | aerodrome | Ukraine | — |
| Ol'khovets | aerodrome | Russia | — |
| Olkiombo Airport | international | Kenya | IATA OLX · ICAO HKOK |
| Olkurruk Mara Airport | international | Kenya | IATA ANA · ICAO HKOM |
| Ollagüe Airport | aerodrome | Chile | — |
| Oller Landing Strip | aerodrome | United States | — |
| Ollombo Airport | international | Congo - Brazzaville | IATA OLL · ICAO FCOD |
| Olmaisor Airport | aerodrome | Kenya | — |
| Olmstead Landing Strip | aerodrome | United States | — |
| Olmstead Sky Ranch | aerodrome | United States | — |
| Olney Municipal Airport | international | United States | IATA ONY · ICAO KONY |