The Tenerife Airport Disaster occurred on March 27, 1977, at Los Rodeos Airport in Tenerife, Canary Islands. It involved two Boeing 747 jumbo jets, operated by KLM and Pan Am, colliding on the runway during dense fog. The accident resulted in the deaths of 583 people, making it the deadliest aviation disaster in history. The disaster was caused by a series of miscommunications and misunderstandings between the flight crews and air traffic control. The KLM aircraft attempted to take off without clearance, leading to the tragic collision with the Pan Am plane, which was taxiing on the runway.