O is for
Overhead
model of North American Aviation P 51 Mustang hanging from the hanger's rafters at the Combat Air Museum in Topeka -
http://www.combatairmuseum.org/
"The Mustang was the first single-engine plane based in Britain to penetrate Germany, first to reach Berlin, first to go with the heavy bombers over the Ploiesti oil fields in Romania, and first to make a major-scale, all-fighter sweep specifically to hunt down the dwindling Luftwaffe.
One of the highest honors accorded to the Mustang was its rating in 1944 by the Truman Senate War Investigating Committee as “the most aerodynamically perfect pursuit plane in existence.” "
Boeing: Historical Snapshot: P-51 Mustang Fighter
1 photo is black and white because it had picked up a yellow reflection from a plane below it
2 the business end
[ got beat out of M is for Model by Geodude, so I had to "scramble" for an O word ]