On March 27, 1977 the greatest airline disaster in history took place at Los Rodeos Airport on the island of Tenerife in the Canary Islands. Two 747 aircrafts, KLM Flight 4805 and Pan Am Flight 1736, collided in fog. The crash killed 583 people, with just 61 survivors. The accident has been analyzed in depth and the conclusion is that it was caused by a cascade of errors in both communication and human nature.