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

| Company | Type | Location | Codes |
|---|---|---|---|
| Otterbach Farm Airport | aerodrome | United States | — |
| Otter Lake Airport | aerodrome | Canada | — |
| Otter Lake Seaplane Base | aerodrome | Canada | — |
| Otterson Ranch Airport | aerodrome | United States | — |
| Otter Springs Park and Campground airstrip | private airstrip | United States | — |
| Ottertail Lake Airport | aerodrome | Three Forks, United States | — |
| Ott Farms Airport | aerodrome | United States | — |
| Ottiger Airport | aerodrome | United States | — |
| Ott Landing Strip | aerodrome | United States | — |
| Ottman Landing Airport | aerodrome | United States | — |
| Ottmarsbocholt Airstrip | private airstrip | Germany | — |
| Otto Junior 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 |
| United States |
| — |
| Otto Landing Field | aerodrome | United States | — |
| Ottosdal Airport (CLOSED) | aerodrome | South Africa | — |
| Ott's Landing Airport | aerodrome | United States | — |
| Ottumwa Regional Airport | international | United States | IATA OTM · ICAO KOTM |
| Otu Airport | international | Colombia | IATA OTU · ICAO SKOT |
| Otvazhniy Airstrip | aerodrome | Russia | — |
| Ouadda Airport | international | Central African Republic | IATA ODA · ICAO FEFW |
| Ouagadougou International Airport | international | Burkina Faso | IATA OUA · ICAO DFFD |
| Ouahigouya Airport | international | Burkina Faso | IATA OUG · ICAO DFCC |
| Ouallam Airport | aerodrome | Niger | ICAO DRRU |
| Ouanary Airport | aerodrome | France | — |
| Ouanda Djallé Airport | international | Central African Republic | IATA ODJ · ICAO FEGO |
| Ouani Airport | international | Comoros | IATA AJN · ICAO FMCV |
| Ouargaye Airport | private airstrip | Burkina Faso | — |
| Ouarzazate Airport | international | Morocco | IATA OZZ · ICAO GMMZ |
| Oudomxay Airport | international | Laos | IATA ODY · ICAO VLOS |
| Oudtshoorn Aerodome | international | South Africa | IATA OUH · ICAO FAOH |
| Oued Zine Airport | aerodrome | Algeria | — |
| Ouésso Airport | international | Congo - Brazzaville | IATA OUE · ICAO FCOU |
| Ouezzane Airport | aerodrome | Morocco | ICAO GMFA |
| Ouiné - Privé | aerodrome | France | — |
| Oujda-Angad Airport | international | Morocco | IATA OUD · ICAO GMFO |
| Oulu Airport | international | Finland | IATA OUL · ICAO EFOU |
| Oum Dreyga Airfield | aerodrome | Morocco | — |
| Oum El Bouaghi Airport | military airfield | Algeria | ICAO DABO |
| Oum Hadjer Airport | international | Chad | IATA OUM |
| Our Community Hospital Heliport | aerodrome | United States | — |
| Ourdel Airport | aerodrome | Australia | ICAO YODL |
| Ourilândia do Norte Airport | international | Brazil | IATA OIA · ICAO SDOW |
| Ouro Branco Tonoro Pista | aerodrome | Venezuela | ICAO SVOU |
| Ouroland | aerodrome | Brazil | — |
| Ouro Sogui Airport | international | Senegal | IATA MAX · ICAO GOSM |
| Ousel Falls Airport | aerodrome | United States | — |
| Outapi Airport | aerodrome | Namibia | ICAO FY32 |
| Outback Airport | aerodrome | United States | — |
| Outback Ranch Airstrip | aerodrome | United States | — |
| Outjo Airfield | aerodrome | Namibia | ICAO FYOJ |
| Outlaw Field | international | United States | IATA CKV · ICAO KCKV |