NASA TV UFOs:
STS-75 UFO Over Mexico

The footage was apparently filmed on 5 March 1996:

http://www.youtube.com/watch?v=nSQnO-naMHA

I’ve previously reported about two other STS-75 UFO videos:

nasa-tv-ufos-ufo-cluster-filmed-during.html

nasa-tv-ufos-nasa-sts-75-unknown-object.html

The NASA STS-75 Columbia mission:

Launch date: 22 February 1996 -
Landing date: 9 March 1996.

UFO News Article:
“Hot line set up for information about UFOs”,
8 August 1975 (Eugene Register-Guard, Oregon)

The Eugene Register-Guard informs on the J. Allen Hynek Center for UFO Studies’ toll-free hot line:

http://news.google.com/newspapers?id=G44QAAAAIBAJ&sjid=J-ADAAAAIBAJ&pg=5018,2028497

Dr. J. Allen Hynek, U.S. Astronomer,
the U.S. Air Force's Scientific Consultant
on UFOs (1948-1969), UFO Author,
Lecturer & Researcher
(4.bp.blogspot.com)