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
These lights rotate to serve as a safety warning to ground ...
The Michoud Assembly Facility (MAF) is an 832-acre ...
This is not just the largest or the biggest airport in the ...
One of the most prestigious and biggest commercial air ...
Spanair was a Spanish airline, with its head office in the ...
A process to fill in the gaps and spaces with pieces of ...
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