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 main structure or body of most types of airplanes, to ...
Hong Kong International Airport is the main airport in Hong ...
The first Boeing777 crash was Asiana Airlines Flight 214 on ...
The Boeing 747-8 Intercontinental is a wide-body commercial ...
Lighting system: all the lightning in an area and the items ...
A helicopter with wings to attain much higher flying speed. ...
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