["On March 27, 1977, on the island of Tenerife in the Canary Islands, two fully loaded 747 jumbo jets collided on a fogbound runway, killing 583 people in what is still the deadliest crash in aviation history. At the time, the facts of the accident were shocking and inexplicable. In the fog, a KLM 747 began an unauthorized takeoff, slamming into a Pan Am 747 that was taxiing on the same runway. T"]