A supposedly unusual contrail turns out to just be a business jet making a slight course correction. This seems much more dramatic than it actually was, because of the forced perspective.
Looks like a normal flight that was vectored (directed by air traffic control) away from its course for normal traffic avoidance
Published: Tue, September 23, 2014
The contrail – a thin water vapour trail that forms behind an aircraft – suggests an as-yet unidentified flying object swerved abruptly as it flew over Hampshire.
The mysterious contrail then banks sharply again, leaving a sharp hook shape etched into the sky, above Portsmouth.
Teacher Florence Lehmann first saw the puzzling shape as she left her Southsea home at around 7.20am.
UK is on BST right now, so 7:20AM is 06:20 UTC. The photo was taken Monday Sept 22, 2014
UPDATE: Solved! See the following posts.