Message posted by rrindsig on February 20, 2010 at 8:57:20 PST:

Interesting photograph of contrail. I'd been intrigued by the photos of "doughnuts on a rope" contrails, until I saw them for myself.
Last week, I saw one, then another with 10 minutes.
Both apparently at the same altitude as commercial flights in my area and parallel with them. Based on what I saw, I wouldn't attach any particular significance to the observation.

In Reply to: Contrails posted by Ian Reynolds on February 20, 2010 at 1:05:15 PST:

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