Re: In the air

Date:         24 Mar 98 11:38:44 
From:         "Brian Maddison" <>
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>I am told that at any one time two thirds of the world's civil aircraft
>are in the air, and that this is necessary as there is not room for all of
>them on the ground. Is this so?

All civil aircraft ? No, I would guess that only 10% of these are flying at
a time.
Two thirds of all airliners does not seem unreasonable, although I doubt
it's true at all hours. It's 9.30pm on the west coast now, 12.30 in the
east and early morning in Europe. I suspect two thirds are on the ground
right now.