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In the interests of safety, I've been scouring many
aviation-related publications for the definition of "mid" air. Is that at
18,000' where the air density is 1/2 of sea level, or at the mid altitude of the
extremes of where aircraft normally operate, say mid-way between 50,000' and
sea-level, or 25,000'? or the mid-point of where non-oxygen equipped aircraft
usually operate, or 6250'? If any one out there knows, please clue me in. I keep
reading about all these collisions that occur at mid-air, and would like to
avoid that altitude if at all possible on my
flights!
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