It's shorthand for above sea level. A term generally used to define how the top on Earth is to a certain position.
00:46, 15 January 2013
A modified version of the Boeing 747 plane specially ...
The airport, founded in 1928, is the main U.S. gateway for ...
The Messerschmitt Bf 109 was the German's top ...
Cockpit lights are lights that can be found inside the ...
A highly maneuverable fighter plane used during World War I ...
A helicopter with wings to attain much higher flying speed. ...
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