“Pilot In Small Plane Terrified –
Air Controllers Spot Image Of UFO On Radar”,
9 May 1975 (Times-Union, Warsaw, Indiana)
This is an article regarding the UFO sighting by Mexican pilot Carlos Antonio de los Santos Montiel.
http://news.google.com/newspapers?id=SgBHAAAAIBAJ&sjid=WHwMAAAAIBAJ&pg=3896,1415942
The UFO incident occurred over the Ajusco mountain range, south of Mexico City on 3 May 1975.
View of Cumbres del Ajusco National Park from Mexico City
(wikimedia.org photo)