Re: 747 "smoke" trail

Date:         24 May 99 01:52:18 
From:         "John McCurdy" <>
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I don't think you could get a condensation trail off the tail of a 747,
but I could sure be wrong.  I wonder if it was because they were
starting an APU?  It seems to me that the APU of a 747 exhausts out the
tail cone.  When I first read you note I thought they were possibly
jettisonning or venting fuel, but that would have come from the wingtips
and would have looked light condensation, probably.  I agree with your
APU theory.