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
All Nippon Airways Co., Ltd. is a Japanese airline. It is ...
Walter James "Jim" McNerney, Jr, (born August 22, ...
A highly maneuverable fighter plane used during World War I ...
The main structure or body of most types of airplanes, to ...
The fourth largest airport in the world, with 66,795,178 ...
Incheon International Airport is the largest airport in ...
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