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- OL - OLT - Germany - Commuter flights from Bremen to London, Berlin, Naples, Toulouse
- OA - Olympic Airways - Greece - Flag carrier
- WY - Oman Air - Oman - International flights from Muscat on B737s and ATRs
- ORK - ORCA AirLines - Egypt - From Cairo to the Middle East
- OX - Orient Thai Airlines - Thailand - Southeast Asia on B747s and L1011s
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