Oh dear, people will try to read all sorts of things in to things "in the sky".

http://news.sky.com/story/1340250/mystery-over-weird-plane-trail-photograph

All it was caused by was wind drift or the other aircraft crossing it.

Living on a hill and under several air routes including those from North America I see con trails all the time and sometimes the long-lived ones (some disappear quickly) end up looking quite strange.