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IATA 3-letter airport codes: O
OAG	Orange, New South Wales, Australia
OAJ	Jacksonville, NC [Albert J. Ellis Airport], USA
OAK	Oakland, CA [Metropolitan Oakland International Airport], USA
OAM	Oamaru, New Zealand
OAN	Olanchito, Honduras
OAR	Fort Ord/Monterey, CA [Fritzsche Army Air Field], USA
OAX	Oaxaca [Xoxocotlan], Mexico
OBA	Oban, Queensland, Australia
OBC	Obock, Djibouti
OBD	Obano, Indonesia
OBE	Okeechobee, FL [Okeechobee County Airport], USA
OBF	Oberpfaffenhofen [Dornier/DLR], Germany
OBI	Obidos, PA, Brazil
OBK	Northbrook, IL [Plaza Heliport], USA
OBM	Morobe, Papua New Guinea
OBN	Oban, United Kingdom
OBO	Obihiro, Japan
OBS	Aubenas, France
OBT	Oakland, CA [Coliseum Street], USA
OBU	Kobuk, AK [Kobuk Airport], USA
OBX	Obo, Papua New Guinea
OBY	Scoresbysund, Greenland
OCA	Key Largo, FL [Ocean Reef Club Airport], USA
OCC	Coca, Ecuador
OCE	Ocean City, MD [Ocean City Municipal Airport], USA
OCF	Ocala, FL [Ocala Regional Airport/Jim Taylor Field], USA
OCH	Nacogdoches, TX [A.L. Mangham Jr. Regional Airport], USA
OCI	Oceanic, AK, USA
OCJ	Ocho Rios, Jamaica
OCN	Oceanside, CA [Oceanside Municipal Airport], USA
OCO	San Jose [El Coco], Costa Rica
OCQ	Oconto, WI [Oconto Municipal Airport], USA
OCV	Ocana, Colombia
OCW	Washington, NC [Warren Field], USA
ODA	Ouadda, Central African Republic
ODB	Cordoba [San Jeronimo], Spain
ODD	Oodnadatta, South Australia, Australia
ODE	Odense [Beldringe], Denmark
ODH	Odiham, England [Odiham RAF Station], United Kingdom
ODJ	Ouanda Djalle, Central African Republic
ODL	Cordillo Downs, South Australia, Australia
ODM	Oakland, MD [Garrett County Airport], USA
ODN	Long Seridan, Sarawak, Malaysia
ODR	Ord River, Western Australia, Australia
ODS	Odessa, Odesa [Tsentrainy], Ukraine
ODW	Oak Harbor, WA [Oak Harbor Air Park], USA
ODX	Ord, NE [Evelyn Sharp Field], USA
ODY	Oudomxay, Laos
OEA	Vincennes, IN [O'Neal Airport], USA
OEC	Ocussi, Indonesia
OEL	Oakley, KS [Oakley Municipal Airport], USA
OEM	Paloemeu, Suriname
OEO	Osceola, WI [L.O. Simenstad Municipal Airport], USA
OER	Ornskoldsvik, Sweden
OES	San Antonio Oeste [Antoine de Ste.-Exupery], Argentina
OFF	Omaha, NE [Offutt Air Force Base], USA
OFI	Ouango Fitini, Ivory Coast
OFJ	Olafsfjordur, Iceland
OFK	Norfolk, NE [Karl Stefan Memorial Airport], USA
OFP	Richmond/Ashland, VA [Hanover County Municipal Airport], USA
OFU	Ofu Island [Ofu Airport], American Samoa
OGA	Ogallala, NE [Searle Field], USA
OGB	Orangeburg, SC [Orangeburg Municipal Airport], USA
OGD	Ogden, UT [Ogden-Hinckley Airport], USA
OGE	Ogeranang, Papua New Guinea
OGG	Kahului, HI [Kahului Airport], USA
OGL	Ogle, Guyana
OGM	Ontonagon, MI [Ontonagon County Airport], USA
OGN	Yonaguni Jima, Japan
OGO	Abengourou, Ivory Coast
OGR	Bongor, Chad
OGS	Ogdensburg, NY [Ogdensburg International Airport], USA
OGX	Ouargla, Algeria
OGZ	Vladikavkaz, North Ossetia, Russia
OHC	Northeast Cape, AK, USA
OHD	Ohrid, Macedonia
OHI	Oshakati, Namibia
OHP	Oban [Oban Heliport], United Kingdom
OHR	Wyk auf Foehr, Germany
OHT	Kohat, Pakistan
OIC	Norwich, NY [Lt. Warren Eaton Airport], USA
OIL	Oil City, PA [Splane Memorial Airport], USA
OIM	Oshima Island, Japan
OIN	Oberlin, KS [Oberlin Municipal Airport], USA
OIR	Okushiri, Japan
OIT	Oita, Japan
OJC	Olathe, KS/Kansas City, MO [Johnson County Executive Airport], USA
OJO	Outjo, Namibia
OJW	Otjiwarongo, Namibia
OKA	Okinawa, Ryukyu Is., Japan
OKB	Orchid Beach, Australia
OKC	Oklahoma City, OK [Will Rogers World Airport], USA
OKD	Sapporo [Okadama], Japan
OKE	Okino Erabu, Japan
OKF	Okaukuejo, Namibia
OKG	Okoyo, Congo
OKH	Oakham, England [Cottesmore RAF Station], United Kingdom
OKI	Oki Island, Japan
OKJ	Okayama, Japan
OKK	Kokomo, IN [Kokomo Municipal Airport], USA
OKL	Oksibil, Indonesia
OKM	Okmulgee, OK [Okmulgee Municipal Airport], USA
OKN	Okondja, Gabon
OKO	Yokota [Yokota Air Force Base], Japan
OKP	Oksapmin, Papua New Guinea
OKQ	Okaba, Indonesia
OKR	Yorke Islands, Queensland, Australia
OKS	Oshkosh, NE [Garden County Airport], USA
OKU	Mokuti, Namibia
OKY	Oakey, Queensland, Australia
OKZ	Sandersville, GA [Kaolin Field], USA
OLA	Orland, Norway
OLB	Olbia, Sardinia [Costa Smeralda], Italy
OLD	Old Town, ME [Dewitt Field/Old Town Municipal Airport], USA
OLE	Olean, NY [Cattaraugus County-Olean Airport], USA
OLF	Wolf Point, MT [L. M. Clayton Airport], USA
OLG	Solon Springs, WI [Solon Springs Municipal Airport], USA
OLH	Old Harbor, AK [Old Harbor Airport], USA
OLI	Olafsvik, Iceland
OLJ	Olpoi, Vanuatu
OLM	Olympia, WA [Olympia Airport], USA
OLN	Colonia Sarmien, Argentina
OLO	Olomouc, Czech Republic
OLP	Olympic Dam, South Australia, Australia
OLQ	Olsobip, Papua New Guinea
OLS	Nogales, AZ [Nogales International Airport], USA
OLU	Columbus, NE [Columbus Municipal Airport], USA
OLV	Olive Branch, MS [Olive Branch Airport], USA
OLY	Olney-Noble, IL [Olney-Noble Airport], USA
OLZ	Oelwein, IA [Oelwein Municipal Airport], USA
OMA	Omaha, NE [Eppley Airfield], USA
OMB	Omboue, Gabon
OMC	Ormoc, Philippines
OMD	Oranjemund, Namibia
OME	Nome, AK [Nome Airport], USA
OMF	Mafraq [King Hussein Air Base], Jordan
OMG	Omega, Namibia
OMH	Urmieh, Iran
OMJ	Omura, Japan
OMK	Omak, WA [Omak Airport], USA
OML	Omkalai, Papua New Guinea
OMM	Marmul, Oman
OMN	Osmanabad, India
OMO	Mostar, Bosnia-Herzegovina
OMR	Oradea, Romania
OMS	Omsk, Omsk, Russia
OMY	Oddor Meanchey, Cambodia
ONA	Winona, MN [Winona Municipal Airport-Max Conrad Field], USA
ONB	Ononge, Papua New Guinea
OND	Ondangwa, Namibia
ONE	Onepuso, Solomon Islands
ONG	Mornington Island, Queensland, Australia
ONH	Oneonta, NY [Oneonta Municipal Airport], USA
ONI	Moanamani, Indonesia
ONL	O'Neill, NE [The O'Neill Municipal Airport-John L. Baker Field], USA
ONM	Socorro, NM [Socorro Municipal Airport], USA
ONN	Onion Bay, AK, USA
ONO	Ontario, OR [Ontario Municipal Airport], USA
ONP	Newport, OR [Newport Municipal Airport], USA
ONR	Monkira, Queensland, Australia
ONS	Onslow, Western Australia, Australia
ONT	Ontario, CA [Ontario International Airport], USA
ONU	Ono I Lau, Fiji
ONX	Colon, Panama
ONY	Olney, TX [Olney Municipal Airport], USA
OOA	Oskaloosa, IA [Oskaloosa Municipal Airport], USA
OOK	Toksook Bay, AK [Toksook Bay Airport], USA
OOL	Gold Coast (Coolangatta), Queensland, Australia
OOM	Cooma, New South Wales, Australia
OOR	Mooraberrie, Queensland, Australia
OOT	Onotoa, Kiribati
OPA	Kopasker, Iceland
OPB	Open Bay, Papua New Guinea
OPF	Miami, FL [Opa Locka Airport], USA
OPG	Ogn, Papua New Guinea
OPI	Oenpelli, Northern Territory, Australia
OPL	Opelousas, LA [St. Landry Parish Airport-Ahart Field], USA
OPN	Thomaston, GA [Thomaston-Upson County Airport], USA
OPO	Porto (Oporto) [Francisco Sa Carneiro (Pedras Rubras)], Portugal
OPS	Sinop, MT, Brazil
OPU	Balimo, Papua New Guinea
OPW	Opuwa, Namibia
OQW	Maquoketa, IA [Maquoketa Municipal Airport], USA
ORA	Oran, Argentina
ORB	Orebro, Sweden
ORC	Orocue, Colombia
ORD	Chicago, IL [Chicago-O'Hare International Airport], USA
ORE	Orange, MA [Orange Municipal Airport], USA
ORF	Norfolk/Virginia Beach/Williamsburg, VA [Norfolk International Airport], USA
ORG	Paramaribo [Zorg en Hoop], Suriname
ORH	Worcester, MA [Worcester Municipal Airport], USA
ORI	Port Lions, AK [Port Lions Airport], USA
ORJ	Orinduik, Guyana
ORK	Cork, Ireland
ORL	Orlando, FL [Executive Airport], USA
ORM	Northampton/Peterborough, England [Northampton Airport/Wittering RAF Station], United Kingdom
ORN	Oran [Es Senia], Algeria
ORO	Yoro, Honduras
ORP	Orapa, Botswana
ORQ	Norwalk, CT, USA
ORR	Yorketown, South Australia, Australia
ORS	Orpheus Island Resort, Queensland, Australia
ORT	Northway, AK [Northway Airport], USA
ORU	Oruro, Bolivia
ORV	Noorvik, AK [Robert (Bob) Curtis Memorial Airport], USA
ORW	Ormara, Pakistan
ORX	Oriximina, PA, Brazil
ORY	Paris [Orly], France
ORZ	Orange Walk, Belize
OSA	Osaka [Metropolitan Area], Japan
OSB	Osage Beach, MO [Grand Glaize-Osage Beach Airport], USA
OSC	Oscoda, MI [Oscoda-Wurtsmith Airport], USA
OSD	Ostersund [Froson Air Base], Sweden
OSE	Omora, Papua New Guinea
OSH	Oshkosh, WI [Wittman Regional Airport], USA
OSI	Osijek, Croatia
OSK	Oskarshamn, Sweden
OSL	Oslo [Metropolitan Area], Norway
OSM	Mosul, Iraq
OSN	Osan [Air Base], South Korea
OSP	Slupsk, Poland
OSR	Ostrava [Mosnov], Czech Republic
OSS	Osh, Osh, Kyrgyzstan
OST	Ostend (Oostende), Belgium
OSU	Columbus, OH [Ohio State University Airport], USA
OSW	Orsk, Orenburg, Russia
OSX	Kosciusko, MS [Kosciusko-Attala County Airport], USA
OSY	Namsos, Norway
OSZ	Koszalin, Poland
OTA	Kota, Ethiopia
OTC	Bol, Chad
OTD	Contadora, Panama
OTG	Worthington, MN [Worthington Municipal Airport], USA
OTH	North Bend, OR [North Bend Municipal Airport], USA
OTI	Morotai Island, Indonesia
OTL	Boutilimit, Mauritania
OTM	Ottumwa, IA [Ottumwa Industrial Airport], USA
OTN	Oaktown, IN [Green Airport], USA
OTO	Otto, NM, USA
OTP	Bucharest [Otopeni], Romania
OTR	Coto 47, Costa Rica
OTS	Anacortes, WA [Anacortes Airport], USA
OTU	Otu, Colombia
OTV	Otavia, Namibia
OTY	Oria, Papua New Guinea
OTZ	Kotzebue, AK [Ralph Wien Memorial Airport], USA
OUA	Ouagadougou, Burkina Faso
OUC	Ouaga, Ivory Coast
OUD	Oujda [Les Anglades], Morocco
OUE	Ouesso, Congo
OUG	Ouahigouya, Burkina Faso
OUH	Oudtshoorn, South Africa
OUK	Outer Skerries, Shetland Islands, United Kingdom
OUL	Oulu, Finland
OUM	Hadjer, Chad
OUN	Norman, OK [University of Oklahoma Westheimer Airport], USA
OUR	Batouri, Cameroon
OUS	Ourinhos, SP, Brazil
OUT	Bousso, Chad
OUU	Quanga, Gabon
OUZ	Zouerate, Mauritania
OVA	Bekily, Madagascar
OVB	Novosibirsk, Novosibirsk [Tolmachevo], Russia
OVD	Oviedo/Aviles [Asturias], Spain
OVE	Oroville, CA [Oroville Municipal Airport], USA
OVL	Ovalle, Chile
OVN	Ouven, Australia
OVO	North Vernon, IN [North Vernon Airport], USA
OWA	Owatonna, MN [Owatonna Municipal Airport], USA
OWB	Owensboro, KY [Owensboro-Daviess County Airport], USA
OWD	Norwood, MA [Norwood Memorial Airport], USA
OWE	Owendo, Gabon
OWI	Ottawa, KS [Ottawa Municipal Airport], USA
OWK	Norridgewock, ME [Central Maine Airport of Norridgewock], USA
OWX	Ottawa, OH [Putnam County Airport], USA
OXC	Oxford, CT [Waterbury-Oxford Airport], USA
OXD	Oxford, OH [Miami University Airport], USA
OXF	Oxford, England, United Kingdom
OXI	Knox, IN [Starke County Airport], USA
OXO	Orientos, New South Wales, Australia
OXR	Oxnard, CA [Oxnard Airport], USA
OXV	Knoxville, IA [Knoxville Municipal Airport], USA
OXY	Morney Plains, Queensland, Australia
OYA	Goya, Argentina
OYE	Oyem, Gabon
OYG	Moyo, Uganda
OYK	Oiapoque, AP, Brazil
OYL	Moyale, Kenya
OYN	Ouyen, Victoria, Australia
OYO	Tres Arroyos, Argentina
OYP	St. George Oyapock, French Guyana
OYS	Yosemite Park, CA, USA
OZA	Ozona, TX [Ozona Municipal Airport], USA
OZC	Ozamis City, Philippines
OZH	Zaporizhzhya, Zaporizhzhya, Ukraine
OZP	Moron de la Frontera [Moron Air Base], Spain
OZR	Fort Rucker (Ozark), AL [Cairns Army Air Field], USA
OZZ	Ouarzazate, Morocco