On March 27, 1977, on the island of Tenerife, two fully loaded 747 jumbo jets collided on a fog-blanketed runway, claiming the lives of 583 people in what is still the deadliest crash in aviation history. Featuring moving interviews with the few survivors of the disaster and with top accident investigators, this program examines the fateful confluence of events that led to the Tenerife tragedy and its continuing relevance for air travel today. (pbs.org)