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
Changi International Airport, or simply Changi Airport, is ...
Also called drones over U.S., surveillance society is a ...
It's located at Hillingdon, London in the United Kingdom. ...
The main structure or body of most types of airplanes, to ...
The Berlin Brandenburg Airport is an international airport ...
The North American P-51 Mustang was the cream of the ...
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