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
Qantas is the flag carrier airline of Australia. The name ...
A new Lockheed Martin concept plane that is able to fly up ...
A subsidiary of the AMR Corporation and headquartered in ...
This is not just the largest or the biggest airport in the ...
The legal combination of two or more airline companies into ...
Is a part of the strutucture of an aircraft. Is a ...
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