| O8 - Oasis Hong Kong Airlines - Hong
Kong - low cost scheduled services to London Gatwick Airport and Vancouver
- defunct
OA - Olympic
Airways - Greece - Flag carrier
OC - Olt
Ostfriesische Lufttransport Gmbh - Germany
- bases in Emden, Bremen, Bremerhaven and Heide/Büsum as well as on
the islands of Borkum and Helgoland
WY - Oman
Air - Oman - Middle East and Europe
OC - Omni
Air International - USA - based in Tulsa,
Oklahoma
ORK - ORCA AirLines - Egypt
- From Cairo to the Middle East
R2 - Orenburg
Airlines - Russia - Orenburg Tsentralny Airport
- Volga Federal District
OX - Orient
Thai Airlines - Thailand - Suvarnabhumi
Airport, Bangkok
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