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

| Company | Type | Location | Codes |
|---|---|---|---|
| Oakley Microlight | aerodrome | United Kingdom | — |
| Oakley Municipal Airport | aerodrome | United States | — |
| Oak Ridge Airpark | aerodrome | United States | — |
| Oak Ridge Airport | aerodrome | United States | — |
| Oak Ridge Farms Airport | aerodrome | United States | — |
| Oak Ridge Plantation Airport | aerodrome | United States | — |
| Oakridge State Airport | aerodrome | United States | — |
| Oaks Airport | aerodrome | United States | — |
| Oaksdale Airport | aerodrome | United States | — |
| Oaksey Park Airfield | aerodrome | United Kingdom | ICAO EGTW |
| Oak Tree Landing Airport | aerodrome | United States | — |
| Oak Valley Airport |
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
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| aerodrome |
| Australia |
| — |
| Oakview Airport | aerodrome | United States | — |
| Oakwood | aerodrome | Australia | — |
| Oaky Creek Airport | aerodrome | Australia | — |
| Oamaru Airport | international | New Zealand | IATA OAM · ICAO NZOU |
| ÖAMTC Flugrettungszentrum West | heliport | Austria | — |
| ÖAMTC Luftrettungstation Wien-Erdberg | heliport | Wien, Austria | ICAO LOBF |
| ÖAMTC Luftrettungstation Wiener Neustadt | heliport | Wiener Neustadt, Austria | ICAO LOAW |
| ÖAMTC Luftrettungstation Ybbsitz | heliport | Ybbsitz, Austria | — |
| Oasis Ranger Station-U.S. Government Airport | aerodrome | Everglades City, United States | — |
| Oáza Dětřichov | aerodrome | Czechia | — |
| Obajana Airstrip | aerodrome | Nigeria | — |
| Oban Airport | international | North Connel, United Kingdom | IATA OBN · ICAO EGEO |
| O’Bannon Creek Aerodrome | aerodrome | Goshen, United States | — |
| Obaye | aerodrome | Congo - Kinshasa | — |
| Obaye Airport | aerodrome | Congo - Kinshasa | ICAO FZNQ |
| Oberlander Airport | aerodrome | United States | — |
| Oberlin Municipal Airport | aerodrome | United States | ICAO KOIN |
| Obio Airstrip | aerodrome | Indonesia | — |
| Obi One Airport | aerodrome | United States | — |
| Obo Airport | regional | Central African Republic | — |
| Obo Airport | international | Papua New Guinea | IATA OBX · ICAO AYOB |
| Obock Airport | international | Djibouti | IATA OBC · ICAO HDOB |
| Obogwy | private airstrip | Indonesia | — |
| Obre Lake/North of Sixty Seaplane Base | aerodrome | Canada | — |
| O'Brien Airpark | aerodrome | United States | — |
| O'Brien Airpark East/West | aerodrome | United States | — |
| O'Brien Flying Service Airport | aerodrome | United States | — |
| O'Brien Flying Services | aerodrome | United States | — |
| Obsianka | aerodrome | Belarus | — |
| Obura Airstrip | aerodrome | Papua New Guinea | ICAO AYOD |
| Ocala International Airport | international | United States | IATA OCF · ICAO KOCF |
| Ocamo Runway | aerodrome | Venezuela | — |
| Oceana County Airport | aerodrome | United States | — |
| Ocean City Municipal Airport | international | Berlin, United States | IATA OCE · ICAO KOXB |
| Ocean City Municipal Airport | aerodrome | United States | — |
| Ocean County Airport at Robert J Miller Air Park | international | Bayville, United States | IATA MJX · ICAO KMJX |
| Ocean Falls Seaplane Base | international | Canada | IATA ZOF |
| Oceano County Airport | aerodrome | United States | — |