Air Traffic Control Audio:
Pilot UFO Sighting: Cleveland ATC

Cleveland (Ohio) Air Traffic Control communication with pilots (Air Shuttle 5959 and Masaba 3179) sighting a UFO:

http://www.youtube.com/watch?v=IbMEZgwHABg

The incident date was 28 February 1996, at 0:50 a.m., according to the video source.