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Paul,
I'm
sure that this question is tongue-in-cheek. But just in case, surely this
simply means a collision between two or more aircraft while fully airborne.
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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