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

| Company | Type | Location | Codes |
|---|---|---|---|
| Ostrów Wielkopolski-Michałków | aerodrome | Poland | ICAO EPOM |
| Osubi Airport | international | Osubi, Nigeria | IATA QRW · ICAO DNUS |
| O'Sullivan Army Heliport | military airfield | United States | ICAO KCSL |
| Osvaldo Vieira International Airport | international | Guinea-Bissau | IATA OXB · ICAO GGOV |
| Oswald Field | aerodrome | United States | — |
| Oswaldo Guevara Mujica Airport | international | Venezuela | IATA AGV · ICAO SVAC |
| Oswego County Airport | regional | United States | ICAO KFZY |
| Oswego Municipal Airport | aerodrome | United States | — |
| O S Wyatt Airport | aerodrome | United States | — |
| Osypnoy Bugor Airfield | aerodrome | Russia | — |
| OTA | aerodrome | Uruguay | — |
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.
| Otago |
| private airstrip |
| Zambia |
| ICAO FLOT |
| Otaki Airfield | aerodrome | Japan | — |
| Otaki Airstrip | aerodrome | New Zealand | ICAO NZOT |
| Otavi Airfield | international | Namibia | IATA OTV · ICAO FYOV |
| Otero Mill Airport | aerodrome | United States | — |
| Otgontenger Airport | international | Mongolia | IATA ULZ · ICAO ZMDN |
| Othawa Airstrip | aerodrome | South Africa | ICAO FAOL |
| Othello Municipal Airport | aerodrome | United States | — |
| Otherton | aerodrome | United Kingdom | — |
| Otjikaru Airstrip | aerodrome | Namibia | ICAO FYRO |
| Otjinene Landing Site | aerodrome | Namibia | ICAO FYTN |
| Otjiruze Airstrip | aerodrome | Namibia | — |
| Otjisazu Airstrip | aerodrome | Namibia | ICAO FYTZ |
| Otjitambi Airstrip | aerodrome | Namibia | ICAO FYTU |
| Otjitambi Microflights Airstrip | aerodrome | Namibia | — |
| Otjite Airfield | aerodrome | Namibia | — |
| Otjitoroa Airstrip | aerodrome | Namibia | — |
| Otjivero Airfield | aerodrome | Namibia | — |
| Otjiwa Lodge Airstrip | aerodrome | Namibia | ICAO FYTW |
| Otjiwarongo Airport | international | Otjiwarongo, Namibia | IATA OTJ · ICAO FYOW |
| Otjonjise Airstrip | aerodrome | Namibia | ICAO FYOB |
| Otjosondu (Ebenezer) Airstrip | aerodrome | Namibia | — |
| Otjovasandu Airfield | aerodrome | Namibia | ICAO FYJO |
| Otkaznoye | aerodrome | Russia | — |
| Otobe Heliport | aerodrome | Japan | — |
| Otog Front Banner General Airport | aerodrome | China | — |
| Otone Airfield | aerodrome | Japan | — |
| O'Toole Ranch Airport | aerodrome | United States | — |
| Otradnaya | aerodrome | Russia | — |
| Otrado-Ol'ginskoye | aerodrome | Russia | — |
| Ottawa Airport | aerodrome | United States | — |
| Ottawa / Carp Airport | international | Ottawa, Canada | IATA YRP · ICAO CYRP |
| Ottawa / Casselman (Shea Field) | aerodrome | Canada | — |
| Ottawa / Embrun Aerodrome | aerodrome | Canada | ICAO CPR2 |
| Ottawa Executive Airport | aerodrome | United States | — |
| Ottawa / Gatineau Seaplane Base | aerodrome | Canada | — |
| Ottawa / Manotick (Hope Field) | aerodrome | Canada | — |
| Ottawa Municipal Airport | aerodrome | United States | ICAO KOWI |
| Ottawa / Questral Helicopters Heliport | heliport | Canada | ICAO CQH2 |