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

| Company | Type | Location | Codes |
|---|---|---|---|
| Oscoda County Airport | aerodrome | United States | — |
| Oscoda-Wurtsmith Airport | international | United States | IATA OSC · ICAO KOSC |
| Oscura Army Airfield | military airfield | United States | — |
| Ose flystripe | private airstrip | Norway | — |
| Ose Mountain airfield | private airstrip | United States | — |
| Oserian Naivasha Airport | aerodrome | Kenya | — |
| Oserongoni Airport | aerodrome | Kenya | — |
| Os Flyplass, Vaksinen | aerodrome | Norway | ICAO ENUL |
| Osgood Field | private airstrip | United States | — |
| Oshaco International Airport | aerodrome | Somalia | — |
| Oshakati Airport | international | Namibia | IATA OHI · ICAO FYOS |
| Oshawa 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
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.
| military airfield |
| Canada |
| IATA YOO · ICAO CYOO |
| Oshawa Executive Airport | aerodrome | Oshawa, Canada | ICAO CYOO |
| Oshima Airport | international | Japan | IATA OIM · ICAO RJTO |
| Osh International Airport | international | Kyrgyzstan | IATA OSS · ICAO UCFO |
| Oshkosh Municipal Airport | international | United States | IATA OKS · ICAO KOKS |
| Oshkosh Sky Ranch Airport | aerodrome | United States | — |
| Oshwe Airport | aerodrome | Congo - Kinshasa | ICAO FZBD |
| Oshwe Airport (old) | aerodrome | Congo - Kinshasa | — |
| Osičiny Airstrip | aerodrome | Czechia | — |
| Osieczna | private airstrip | Poland | — |
| Osiek Airstrip | private airstrip | Poland | — |
| Osijek Airport | international | Croatia | IATA OSI · ICAO LDOS |
| Osječki sportski aerodrom | aerodrome | Croatia | ICAO LDOC |
| Oskaloosa Municipal Airport | international | United States | IATA OOA · ICAO KOOA |
| Oskarshamn Airport | international | Oskarshamn, Sweden | IATA OSK · ICAO ESMO |
| Öskemen International Airport | international | Kazakhstan | IATA UKK · ICAO UASK |
| Öskű Airfield | aerodrome | Hungary | — |
| Oslo Airport, Gardermoen | international | Norway | IATA OSL · ICAO ENGM |
| Oslo sjøflyplass, Fornebu | aerodrome | Norway | — |
| Osmanabad | international | India | IATA OMN |
| Osmino | aerodrome | Russia | — |
| Osona Airfield | aerodrome | Namibia | ICAO FYSN |
| Osovtsy Air Base | military airfield | Belarus | ICAO UMMO |
| Osoyoos Airport | aerodrome | Canada | — |
| Osoyoos Airport (CBB9) | aerodrome | Osoyoos, Canada | — |
| Ospika Airport | aerodrome | Canada | — |
| Ossima Airport | international | Papua New Guinea | IATA OSG · ICAO AYZS |
| Ossora Airport | aerodrome | Russia | ICAO UHPD |
| Ostashkov | aerodrome | Russia | — |
| Ostend–Bruges International Airport | international | Belgium | IATA OST · ICAO EBOS |
| Ostergard's Airport | aerodrome | Canada | — |
| Ostlunds Airport | aerodrome | Billings, United States | — |
| Ostrava Leos Janacek Airport | international | Mošnov, Czechia | IATA OSR · ICAO LKMT |
| Østre Æra flyplass | aerodrome | Norway | ICAO ENAE |
| Ostrikovka | private airstrip | Ukraine | — |
| Ostrov | aerodrome | Czechia | — |
| Ostrov Bolshevik | military airfield | Russia | — |
| Ostrov Naval Air Base | military airfield | Russia | — |
| Ostrovo Airfield | aerodrome | Bulgaria | — |