Message posted by OldThudMan~!!~ on April 19, 2015 at 19:49:27 PST:

Looks like a standard contrail to me......Probably an airliner.......

The really interesting one(s) were the knots on a rope contrail(s) out in California IIRC..........

In Reply to: Interesting Contrail Over Seattle posted by Christian Bryan on April 19, 2015 at 17:55:15 PST:

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