| IATA | ICAO | City | Region | State | Country | GEN | | Oslo | | | Norway |
OMR | | Oradea | | | Romania |
ORB | | Orebro | | | Sweden |
OSD | | Ostersund | | | Sweden |
ODS | | Odessa | | | Ukraine |
ODW | | Oak Harbor | | WASHINGTON | USA |
OAK | | Oakland | | CALIFORNIA | USA |
OGS | | Ogdensburg | | NEW YORK | USA |
OKC | | Oklahoma City | | OKLAHOMA | USA |
OLM | | Olympia | | WASHINGTON | USA |
OMA | | Omaha | | NEBRASKA | USA |
ONT | | Ontario | | CALIFORNIA | USA |
ORL | | Orlando | | FLORIDA | USA |
MCO | | Orlando | | FLORIDA | USA |
OSH | | Oshkosh | | WISCONSIN | USA |
OTM | | Ottumwa | | IOWA | USA |
OWB | | Owensboro | | KENTUCKY | USA |
OXR | | Oxnard/Ventura | | CALIFORNIA | USA |
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