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
Qatar Airways Company Q.C.S.C. operating as Qatar Airways, ...
The world's first commercial jetliner that uses ...
Paved surface, usually rectangular and of defined extent, ...
By 2017, Beijing Capital International Airport will be ...
A movable horizontal airfoil, usually attached to the ...
Cathay Pacific is the de facto international flag carrier ...
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