- AIRLINES BY CODE
- O
- OA - Olympic Airways - Greece - Flag carrier
- OG - Go - UK - Now easyjet.
- OH - Comair - USA - Delta Connections using more than 70 Canadair Regionals
- OK - Czech Airlines - Czech Republic - From Prague to world destinations
- OL - OLT - Germany - Commuter flights from Bremen to London, Berlin, Naples, Toulouse
- OM - MIAT Mongolian Airlines - Domestic service plus Moscow, Berlin and southeast Asia, using ANs, an A310 and three 727s
- ON - Air Nauru - Nauru to Australia, Fiji, Kiribati, and the Solomon Islands
- OP - Chalk's Ocean Airways - USA - Miami and Ft. Lauderdale to the Bahamas on Grumman G-73T Turbine Millard amphibious aircraft
- OS - Austrian Airlines - A Swissair partner
- OU - Croatia Airlines - The national airline based in Zagreb
- OV - Estonian Air - To major western European capitals
- OX - Orient Thai Airlines - Thailand - Southeast Asia on B747s and L1011s
- OZ - Asiana Airlines - S. Korea - From Kimpo International to Asian destinations
A B
C D
E F
G H
I J
K L
M N
O P
Q R
S T
U V
Q W
X Y
Z (1-9)
Others
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