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
A sonic boom is the loud sound created by the shock waves ...
The Boeing 707 is a mid-size, long-range, narrow-body ...
A movable horizontal airfoil, usually attached to the ...
Incheon International Airport is the largest airport in ...
Side-stepped is an expression used for those aircrafts that ...
The wild speculations and conspiracy theories that ...
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