| IATA | ICAO | City | Region | State | Country | ORN | | Oran | | | Algeria |
OAG | | Orange | | New South Wales | Australia |
OUA | | Ouagadougou | | | Burkina Faso |
XOK | | Oakville | | Ontario | Canada |
YOO | | Oshawa | | Ontario | Canada |
YOW | | Ottawa | | Ontario | Canada |
ODE | | Odense | | | Denmark |
OUL | | Oulu | | | Finland |
VDA | | Ovda | | | Israel |
OBO | | Obihiro | | | Japan |
OIT | | Oita | | | Japan |
OKJ | | Okayama | | | Japan |
OKA | | Okinawa | | Ryukyu Islands | Japan |
ITM | | Osaka | | | Japan |
KIX | | Osaka | | | Japan |
OSA | | Osaka | | | Japan |
OHD | | Ohrid | | | Macedonia |
OAX | | Oaxaca | | Oaxaca | Mexico |
OZZ | | Ouarzazate | | | Morocco |
FBU | | Oslo | | | Norway |
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