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The planes — Pan Am flight 1736 originating in Los Angeles and KLM Royal Dutch Airlines flight 4805, a charter from Amsterdam — crashed into each other on Los Rodeos Airport's single runway.
Visibility on the ground was poor, limited to 1,000 feet or so, but many other factors led to the disaster. Muddled instructions, malfunctioning runway lights and an overcrowded airport played roles, too, but perhaps the major factor was pilot error, specifically the bad judgment exercised by the Dutch captain.
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DRAMATISED VIDEO OF THE CRASH