On August 9, 1970, at about 3 PM local time, LANSA Flight 502, a Lockheed Electra L-188A 4-engine turboprop, registered OB-R-939, bound from Cuzco, Peru to Lima, operated by Lineas AƩreas Nacionales Sociedad Anonima (LANSA), carrying 8 crew and 92 passengers, crashed into hilly terrain shortly after takeoff after losing one of its engines. All but one of the occupants died from injuries sustained from impact forces and post crash fire. Two people on the ground were killed. There were notably 46 American high school exchange students on board, all of whom perished. At the time, the crash was the worst ever in Peru's history.