OASIS Hong Kong Airlines, Hongkong, 2005-2008. - #1:
OASIS Airlines, Madrid, Spain. Founded 1986 as Andalusair, renamed 1987 after majority stake taken by Oasis hotel group. Ceased operations 1995. #1, #6 and #2:
OCEAN AIR, Sao Paulo, Brazil, 1998-2010 rebranded as Avianca Brazil (q.v.). #3, #5, #1 and #2:
Odyssey International, Toronto, Canada, 1988 - 1990. - with thanks to Lu Lloyd -#1:
Okay Airways, Beijing/Tianjin, China, founded 2004.
- #1, #4, #5, #8:
OLT -
Ostfriesische
Luft
Transport, Bremen, Germany, 1972-2013. - #1:
Olympic Airways, Athens, Greece, 1957-2003.
- #13, #1/#2/#3/#6/#9(diff variations), #5:
Olympic Airlines, 2003-2009. - #16:
Olympic Air, Athens, Greece, as of 2009. - #20, #20A, #22:
OMAN AIR, Muscat, founded 1993.
- #6, #8/#9(flat base, diff maker), #10(pointed base), #11/#14(diff maker at base):
- #3, #5a, #2:
- #7, #12, #17:
OMNI Air International, Tulsa, Oklahoma, USA, founded 1983. - #1, #4:
OMNI Aviacao e Tecnologia, Oeiras, Portugal, founded 1988. - #1:
Onur Air, Istanbul, Turkey, founded 1992.
- #3, #5/ #6(diff. maker), #2, #7:
Orbest Orizonia Airlines, Palma de M., Spain, founded 2011 by renaming from Iberworld (q.v.),
ceased operations 2013. Remainig aircrafts were transfered to sister Company Orbest Portugal(q.v.).
- #2:
Orbest Portugal, Lisbon, founded 2007. - #1:
ORC - Oriental Air Bridge, Omura-Nagasaki, Japan. Founded 2001 by renaming from Nagasaki Airways.
- #1, #2:
ORION Airways, Manchester, UK, 1978 - 1989 merged into Britannia (q.v.). - # 1 and #2:
