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 part of the aircraft fuselage and wing structure that ...
A human powered helicopter developed by AeroVelo, a team of ...
This is not just the largest or the biggest airport in the ...
PT Garuda Indonesia (Persero) Tbk publicly known as Garuda ...
Rumored new fifth-generation Chinese stealth fighter, which ...
Cockpit lights are lights that can be found inside the ...
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