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| ICAO | IATA | Name | Location | Country |
|---|---|---|---|---|
| LTAJ | GZT | O?uzeli Airport | Gaziantep | Turkey |
| KORD | ORD | O'hare International Airport (formerly Orchard Depot Field) | Chicago, Illinois | United States |
| KOEA | OEA | O'neal Airport | Vincennes, Indiana | United States |
| YBOK | OKY | Oakey Army Aviation Centre | Oakey, Queensland | Australia |
| KPTK | PTK | Oakland County International Airport | Pontiac, Michigan | United States |
| KOAK | OAK | Oakland International Airport | Oakland (near San Francisco), California | United States |
| KOEL | OEL | Oakley Municipal Airport | Oakley, Kansas | United States |
| EGTW | Oaksey Park Airport | Oaksey, England | United Kingdom | |
| NZOU | OAM | Oamaru Aerodrome | Oamaru | New Zealand |
| EGEO | OBN | Oban Airport | Oban, Scotland | United Kingdom |
| SKPD | PDA | Obando Airport | Puerto Inírida | Colombia |
| HCMO | CMO | Obbia Airport | Obbia | Somalia |
| KOIN | OIN | Oberlin Municipal Airport | Oberlin, Kansas | United States |
| SBTS | OBI | Óbidos Airport | Óbidos, Pará | Brazil |
| RJCB | OBO | Obihiro Airport (tokachi-obihiro) | Obihiro, Hokkaido | Japan |
| HDOB | OBC | Obock Airport | Obock | Djibouti |
| KOCF | OCF | Ocala International Airport (jim Taylor Field) | Ocala, Florida | United States |
| MYBO | Ocean Cay Airport | Ocean Cay, Bimini | Bahamas | |
| KOXB | OCE | Ocean City Municipal Airport | Ocean City, Maryland | United States |
| OCA | Ocean Reef Club Airport | Key Largo, Florida | United States | |
| KOKB | OCN | Oceanside Municipal Airport | Oceanside, California | United States |
| KCEU | CEU | Oconee County Regional Airport | Clemson, South Carolina | United States |
| RJSR | ONJ | Odate-noshiro Airport | Kitaakita, Akita | Japan |
| EKOD | ODE | Odense Airport | Odense | Denmark |
| UKOO | ODS | Odessa International Airport | Odessa, Ukraine | Ukraine |
| KODO | ODO | Odessa-schlemeyer Field | Odessa, Texas | United States |
| DIOD | KEO | Odienne Airport | Odienne | Ivory Coast |
| WPOC | OEC | Oecussi Airport | Oecussi | East Timor |
| KOLZ | OLZ | Oelwein Municipal Airport | Oelwein, Iowa | United States |
| KOFF | OFF | Offutt Afb | Omaha, Nebraska | United States |
| OFU | Ofu Airport | Ofu | American Samoa | |
| KOGD | OGD | Ogden-hinckley Airport | Ogden, Utah | United States |
| KOGS | OGS | Ogdensburg International Airport | Ogdensburg, New York | United States |
| SYGO | OGL | Ogle Airport | Ogle | Guyana |
| NZOH | OHA | Ohakea Airbase (rnzaf) | Ohakea | New Zealand |
| KOSU | OSU | Ohio State University Airport | Columbus, Ohio | United States |
| KUNI | ATO | Ohio University Airport (snyder Field) (faa: Uni) | Athens / Albany, Ohio | United States |
| KUNI | UNI | Ohio University Snyder Field | Athens/Albany, Ohio | United States |
| LWOH | OHD | Ohrid Airport | Ohrid | Macedonia, Republic of |
| SBOI | OYK | Oiapoque Airport | Oiapoque, Amapá | Brazil |
| RJFO | OIT | Oita Airport | Musashi, Oita | Japan |
| ROIT | Oitakenou Airport | Oitakenou, ?ita | Japan | |
| RJDO | Ojika Airport (nagasaki Ojika) | Ojika, Nagasaki | Japan | |
| WAKO | OKQ | Okaba Airport | Okaba | Indonesia |
| RJCO | OKD | Okadama Airport (sapporo Okadama) | Sapporo, Hokkaido | Japan |
| KVPS | VPS | Okaloosa Regional Airport / Eglin Afb | Valaparaiso (near Fort Walton Beach), Florida | United States |
| FYOO | OKF | Okaukuejo Airport | Okaukuejo | Namibia |
| RJOB | OKJ | Okayama Airport | Okayama, Okayama | Japan |
| KOBE | OBE | Okeechobee County Airport | Okeechobee, Florida | United States |
| RJNO | OKI | Oki Airport | Okinoshima, Shimane | Japan |
| RJKB | OKE | Okinoerabu Airport | Wadomari, Kagoshima | Japan |
| KOKM | OKM | Okmulgee Regional Airport | Okmulgee, Oklahoma | United States |
| FOGQ | OKN | Okondja Airport | Okondja | Gabon |
| WAJO | OKL | Oksibil Airport | Oksibil | Indonesia |
| UTDO | OKT | Oktyabrsky Airport | Oktyabrsky | Tajikistan |
| RJEO | OIR | Okushiri Airport | Okushiri, Hokkaido | Japan |
| MHOA | OAN | Olanchito Airport | Olanchito | Honduras |
| ESMZ | Ölanda Airport | Ölanda | Sweden | |
| SKMD | EOH | Olaya Herrera Airport | Medellín | Colombia |
| LIEO | OLB | Olbia | Costa Smeralda Airport | Italy |
| EGSV | Old Buckenham Airport | Norwich, England | United Kingdom | |
| CYOC | YOC | Old Crow Airport | Old Crow, Yukon | Canada |
| OLH | Old Harbor Airport | Old Harbor, Alaska | United States | |
| EGLS | Old Sarum Airfield | Salisbury, England | United Kingdom | |
| KOLD | OLD | Old Town Municipal Airport And Seaplane Base (dewitt Field) | Old Town, Maine | United States |
| ZMUL | ULG | Ölgii Airport | Ölgii, Bayan Ölgii | Mongolia |
| POLI | OLI | Oliktok Long Range Radar Station | Oliktok Point, Alaska | United States |
| KOLV | OLV | Olive Branch Airport | Olive Branch, Mississippi | United States |
| KONY | ONY | Olney Municipal Airport | Olney, Texas | United States |
| KOLY | OLY | Olney-noble Airport | Olney-Noble, Illinois | United States |
| LKOL | OLO | Olomouc Airport | Olomouc | Czech Republic |
| LFCO | Oloron Herere Airport | Oloron | France | |
| KOLM | OLM | Olympia Airport | Olympia, Washington | United States |
| KOMK | OMK | Omak Airport | Omak, Washington | United States |
| NZOM | Omaka Aerodrome | Blenheim | New Zealand | |
| KMBY | MBY | Omar N. Bradley Airport | Moberly, Missouri | United States |
| NZOA | Omarama Aerodrome | Omarama | New Zealand | |
| FYOE | OMG | Omega Airport | Omega | Namibia |
| OIAJ | OMI | Omidiyeh Air Base | Omidiyeh | Iran |
| FYOA | OND | Ondangwa Airport | Ondangwa | Namibia |
| ZMUH | UNR | Öndörkhaan Airport | Öndörkhaan, Khentii | Mongolia |
| KUCA | UCA | Oneida County Airport | Utica, New York | United States |
| NFOL | ONU | Ono-i-lau Airport | Ono-i-Lau | Fiji |
| NGON | OOT | Onotoa Airport | Onotoa | |
| YOLW | Onslow Airport | Onslow, Western Australia | Australia | |
| KONT | ONT | Ontario International Airport | Ontario (near Los Angeles), California | United States |
| KONO | ONO | Ontario Municipal Airport | Ontario, Oregon | United States |
| KOGM | OGM | Ontonagon County Airport | Ontonagon, Michigan | United States |
| AGGQ | Ontong Java Airport | Ontong Java | Solomon Islands | |
| EBZR | Oostmalle Ab | Zoersel | Belgium | |
| EHOW | Oostwold Airport | Scheemda | Netherlands | |
| KOPF | OPF | Opa-locka Airport | Miami, Florida | United States |
| NZOP | Opotiki Aerodrome | Opotiki | New Zealand | |
| ENOP | Oppdal Airport, Fagerhaug | Oppdal, Sør-Trøndelag | Norway | |
| ESNM | Optand Airport | Optand | Sweden | |
| FYOP | OPW | Opuwa Airport | Opuwa | Namibia |
| FAJS | JNB | Or Tambo International Airport | Johannesburg | South Africa |
| LROD | OMR | Oradea International Airport | Oradea | Romania |
| SASO | ORA | Orán Airport | Orán, Salta Province | Argentina |
| YORG | OAG | Orange Airport | Orange, New South Wales | Australia |
| LFMO | XOG | Orange Caritat Airport | Orange | France |
| KMGJ | MGJ | Orange County Airport | Montgomery, New York | United States |
| KOMH | Orange County Airport | Orange, Virginia | United States | |
| KORG | ORG | Orange County Airport (texas) | Orange, Texas | United States |
| KORE | Orange Municipal Airport | Orange, Massachusetts | United States | |
| KOGB | OGB | Orangeburg Municipal Airport | Orangeburg, South Carolina | United States |
| FYOG | OMD | Oranjemund Airport | Oranjemund | Namibia |
| FBOR | ORP | Orapa Airport | Orapa | Botswana |
| YORB | RBS | Orbost Airport | Orbost, Victoria | Australia |
| KORS | ESD | Orcas Island Airport (faa: Ors) | Eastsound, Washington | United States |
| ESOE | ORB | Örebro Airport | Örebro | Sweden |
| ESGM | Öresten Airport | Öresten | Sweden | |
| MUMO | MOA | Orestes Acosta Airport | Moa | Cuba |
| FAOI | Orient Airfield Ndash; Magaliesburg | South Africa | ||
| SYOR | ORJ | Orinduik Airport | Orinduik | Guyana |
| LIME | BGY | Orio Al Serio International Airport | Bergamo | Italy |
| KORL | ORL | Orlando Executive Airport | Orlando, Florida | United States |
| KMCO | MCO | Orlando International Airport | Orlando, Florida | United States |
| KSFB | SFB | Orlando Sanford International Airport | Sanford, Florida (near Orlando) | United States |
| LFOJ | ORE | Orléans Bricy Airport | Orléans | France |
| LFOZ | Orléans Saint-denis-de-l'hotel Airport | Orléans | France | |
| OPOR | ORW | Ormara Airport | Ormara | Pakistan |
| RPVO | OMC | Ormoc Airport | Ormoc | Philippines |
| KOMN | Ormond Beach Municipal Airport | Ormond Beach, Florida | United States | |
| ESNO | OER | Örnsköldsvik Airport | Örnsköldsvik | Sweden |
| SVON | CBS | Oro Negro Airport | Cabimas | Venezuela |
| SKOE | ORC | Orocue Airport | Orocue | Colombia |
| KOVE | OVE | Oroville Municipal Airport | Oroville, California | United States |
| ESNR | Orsa Airport | Orsa | Sweden | |
| UWOR | OSW | Orsk Airport | Orsk, Russia | Russian Federation |
| KVVV | VVV | Ortonville Municipal Airport (martinson Field) | Ortonville, Minnesota | United States |
| SLOR | ORU | Oruro Airport | Oruro | Bolivia |
| RJOO | ITM | Osaka International Airport (itami) | Itami, Hyogo | Japan |
| RKSO | OSN | Osan Air Base | Osan | Korea, Republic of |
| SNRU | CAU | Oscar Laranjeias Airport | Caruaru, Pernambuco | Brazil |
| KOSC | OSC | Oscoda-wurtsmith Airport | Oscoda, Michigan | United States |
| ENOA | Oseberg A | Oseberg oil field, North Sea | Norway | |
| UAFO | OSS | Osh Airport | Osh | Kyrgyzstan |
| FYOS | OHI | Oshakati Airport | Oshakati | Namibia |
| CYOO | YOO | Oshawa Airport | Oshawa, Ontario | Canada |
| RJTO | OIM | Oshima Airport | Izu ?shima, Tokyo | Japan |
| LDOS | OSI | Osijek Airport | Osijek | Croatia |
| KOOA | OOA | Oskaloosa Municipal Airport | Oskaloosa, Iowa | United States |
| ESMO | OSK | Oskarshamn Airport | Oskarshamn | Sweden |
| UASK | UKK | Oskemen Airport | Oskemen | Kazakhstan |
| ENFB | FBU | Oslo Airport, Fornebu (closed) | Oslo, Akershus | Norway |
| ENGM | OSL | Oslo Airport, Gardermoen | Gardermoen (near Oslo), Akershus | Norway |
| GEN | Oslo Gardermoen | Oslo | Norway | |
| OMN | Osmanabad Airport | Osmanabad | India | |
| VGSY | ZYL | Osmani International Airport | Sylhet | Bangladesh |
| DNOS | Osogbo Airstrip | Osogbo, Osun State | Nigeria | |
| UUMO | Ostafievo International Airport | Moscow, Russia | Russian Federation | |
| EBOS | OST | Ostend-bruges International Airport | Ostend | Belgium |
| ESNZ | OSD | Östersund Airport (f4 Frösön Air Base) | Östersund | Sweden |
| LKMT | OSR | Ostrava-mošnov International Airport | Ostrava | Czech Republic |
| GGOV | OXB | Osvaldo Vieiro International Airport | Bissau | Guinea-Bissau |
| SVAC | AGV | Oswaldo Guevara Mujica Airport | Acarigua | Venezuela |
| KFZY | FZY | Oswego County Airport | Fulton, New York | United States |
| LPOT | Ota Air Base | Ota, Alenquer | Portugal | |
| KFMH | FMH | Otis Angb | Falmouth, Massachusetts | United States |
| LDRO | Oto?ac Airport | Oto?ac | Croatia | |
| LKOT | Otrokovice Airfield | Otrokovice | Czech Republic | |
| CYOW | YOW | Ottawa Macdonald-cartier International Airport (macdonald-cartier International Airport) | Ottawa, Ontario | Canada |
| KOWI | OWI | Ottawa Municipal Airport | Ottawa, Kansas | United States |
| CYRP | YRP | Ottawa/carp Airport (carp Airport) | Carp, Ontario | Canada |
| CYDH | Ottawa/dwyer Hill Heliport | Ottawa, Ontario | Canada | |
| CYRO | YRO | Ottawa/rockcliffe Airport (rockcliffe Airport) | Ottawa, Ontario | Canada |
| KOTM | OTM | Ottumwa Industrial Airport | Ottumwa, Iowa | United States |
| SKOT | OYU | Otu Airport | Otu | Colombia |
| FEFW | ODA | Ouadda Airport | Ouadda | Central African Republic |
| DFFD | OUA | Ouagadougou Airport | Ouagadougou | Burkina Faso |
| DFCC | OUG | Ouahigouya Airport | Ouahigouya | Burkina Faso |
| NWWL | LIF | Ouanaham Airport (wanaham Airport) | Lifou | New Caledonia |
| FEGO | ODJ | Ouanda-djalle Airport | Ouanda-Djalle | Central African Republic |
| DIOF | OFI | Ouango Fitini Airport | Ouango Fitini | Ivory Coast |
| FMCV | AJN | Ouani Airport | Anjouan | Comoros |
| GMMZ | OZZ | Ouarzazate Airport | Ouarzazate | Morocco |
| VLOS | ODY | Oudomsay Airport | Oudomsay | Lao People's Democratic Republic |
| FAOH | OUH | Oudtshoorn Airport | Oudtshoorn | South Africa |
| DAUH | HME | Oued Irara Airport | Hassi Messaoud | Algeria |
| LFEC | Ouessant Airport | Ouessant | France | |
| FCOU | OUE | Ouesso Airport | Ouesso | Republic of the Congo (ROC) |
| NWWV | UVE | Ouloup Airport | Ouvéa | New Caledonia |
| EFOU | OUL | Oulu Airport | Oulunsalo | Finland |
| SBOU | OUS | Ourinhos Airport | Ourinhos, São Paulo | Brazil |
| GOSM | MAX | Ouro Sogui Airport | Matam | Senegal |
| KATW | ATW | Outagamie County Regional Airport | Greenville, Wisconsin near Appleton | United States |
| SNEC | Outeiro Das Brisas Airport | Porto Seguro, Bahia | Brazil | |
| KCKV | CKV | Outlaw Field | Clarksville, Tennessee | United States |
| SCOV | OVL | Ovalle Tuqui Airport | Ovalle Tuqui | Chile |
| LPOV | Ovar Air Base | Ovar | Portugal | |
| LLOV | VDA | Ovda International Airport | Negev | Israel |
| ESNE | Överkalix Airport | Överkalix | Sweden | |
| ESUO | Oviken Airport | Oviken | Sweden | |
| FCOO | FTX | Owando Airport | Owando | Republic of the Congo (ROC) |
| KOWA | OWA | Owatonna Degner Regional Airport | Owatonna, Minnesota | United States |
| MWCR | GCM | Owen Roberts International Airport | Georgetown, Grand Cayman | Cayman Islands |
| CYOS | YOS | Owen Sound/billy Bishop Regional Airport (billy Bishop Regional Airport) | Owen Sound, Ontario | Canada |
| KOWB | OWB | Owensboro-daviess County Airport | Owensboro, Kentucky | United States |
| KRNP | RNP | Owosso Community Airport | Owosso, Michigan | United States |
| EGTK | OXF | Oxford Airport | Oxford, England | United Kingdom |
| CYOH | YOH | Oxford House Airport | Oxford House, Manitoba | Canada |
| KOXR | OXR | Oxnard Airport | Oxnard, California | United States |
| FOGO | OYE | Oyem Airport | Oyem | Gabon |
| LFLK | Oyonnax Arbent Airport | Oyonnax | France | |
| KBPK | Ozark Regional Airport (formerly Baxter County Regional Airport) | Mountain Home, Arkansas | United States | |
| UKKO | Ozerne Airport | Zhytomyr, Ukraine | Ukraine | |
| KOZA | OZA | Ozona Municipal Airport | Ozona, Texas | United States |