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Originally posted by David291
reply to post by Ophiuchus 13
Just a questiom, it states that they are"believed" to have been made by planes passing through thin layers of cloud but if that was true. Wouldn't we be seeing a hell of a lot of these clouds on a daily basis?
or do we? Cause I've enver seen one and I live quite close to an airport.
Originally posted by David291
reply to post by Ophiuchus 13
Hm? Are they not?