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
One of the most prestigious and biggest commercial air ...
The legal combination of two or more airline companies into ...
Rumored new fifth-generation Chinese stealth fighter, which ...
The airport, founded in 1928, is the main U.S. gateway for ...
A human powered helicopter developed by AeroVelo, a team of ...
The Berlin Brandenburg Airport is an international airport ...
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