The Phoenix Lights

The Phoenix Lights (sometimes called the "Lights over Phoenix") were a series of widely sighted unidentified flying objects observed in the skies over the U.S. states of Arizona, Nevada and the Mexican state of Sonora on March 13, 1997.
Lights of varying descriptions were seen by thousands of people between 19:30 and 22:30 MST, in a space of about 300 miles (480 km), from the Nevada line, through Phoenix, to the edge of Tucson. There were two distinct events involved in the incident: a triangular formation of lights seen to pass over the state, and a series of stationary lights seen in the Phoenix area.