It's bright because the jet is at a higher altitude and the ice
crystals in the contrail are probably at about the 22 degree point.
A contrail will appear and disappear as a jet flies through those
whispy, really thing, almost invisible cirrus clouds.
If I knew the exact date, we could pull up weather charts.
AG
--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
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