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
Skin is a sheet of material that covers a fuselage which is ...
The Boeing Company is an American multinational corporation ...
Germany's best overall platform during World War 2. ...
A movable horizontal airfoil, usually attached to the ...
A sharp end object has an edge that can cut or and end that ...
Changi International Airport, or simply Changi Airport, is ...
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