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Like other clouds they (contrails) cast shadows...the shadow falls on a thin lower layer of cirrus cloud...
originally posted by: UngaBungga
a reply to: youdidntseeme
Yes...except that the shadow was about 10 to 15 degrees lower than the actual aircraft. Mystery solved!
When the sun is lined up with the path of the plane the shadow of the contrail is cast in front of the path the plane is following.
Only feasible suggestion I have is that the plane was following the dark trail / shadow?