This is all of the information we have from the submitter:
Allegedly, this video was taken from a passenger plane on May 25, this year. It was taken during morning hours over the city of London.
(UFO Casebook Editor's Note: Most of the comments are very positive as the video approaches 10,000 views in just two days. There are, as you would expect, some negatives.
A couple of watchers even suggest that what we are seeing is a very tall building reaching above the clouds. I don't believe this theory has any merit. Another commenter complains that the object doesn't move; that is because the video is actually still frames made into a moving file.
Check it out and see what you think.)