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
The Boeing 707 is a mid-size, long-range, narrow-body ...
The Berlin Brandenburg Airport is an international airport ...
Rear edge of aerofoil or streamlined strut.
The Boeing 777-Freighter is an all-cargo version of the ...
The wild speculations and conspiracy theories that ...
Qantas is the flag carrier airline of Australia. The name ...
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