The Carlos Antonio de los Santos Montiel UFO Incident, 3 May 1975
This is a recording of the Mexican pilot Carlos Antonio de los Santos Montiel’s Mayday call to Mexico City Benito Juárez International Airport, Mexico City, Mexico:
http://www.youtube.com/watch?v=nGFInOL9pS8
The UFO incident occurred over the Ajusco mountain range (south of Mexico City).
Carlos Antonio de los Santos Montiel (centre)
(3.bp.blogspot.com photo)