Interesting footage of UFO filmed from a plane over Tokyo, Japan 5-Jun-2010

Interesting daytime UFO video of fast flying object filmed from a plane over Tokyo in Japan on 5th June 2010.

Witness report: On the way back to Tokyo from Hokkaido, near Tokyo, June 5, 2010, Filming the clouds from the plane when a fast object crossed. I thought it was an airplane, but studying it afterward it is obviously moving very fast. UFO? Military airplane? It appears 20 seconds into the film.