UFO paralleling a man made aircraft during a suspected "chem-trail" operation caught on video.On 05/27/2013 at approximately 7:30pm I was in my backyard in the process of filming a man made aircraft for a video I was making on "chem-trails". Upon reviewing the video on my P.C. I noticed that in the first minute of the video I had also captured something strange that I had not noticed during filming, probably because I was looking threw a small digital display while filming. However, the video clearly shows a dark, round object that appears to come down from a higher elevation, behind the man made aircraft which was heading North. The UFO then appears to catch up to the airplane and it appears to be flying parallel to the airplane before it vanishes behind a cloud. The UFO had no contrail behind it nor could sounds of a helicopter be heard.