The witness said he started filming after seeing the unusual flight path of the plane in El Cajon, California.
In a report to the Mutual UFO Network (MUFON), which investigates alleged sightings of aliens, he said: "I was outside at 11.30am on January 14 when I noticed a jet heading straight up and began to videotape it.
"Later in the day when playing the video back, my girlfriend and I noticed a fast moving object near the jet that was not visible to the naked eye when recording.
But as we now all know, all the aliens are dead because of climate change. :-( To read more and view the video, click here.