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·Although the 747 has a storied history, many forget that two 747s were involved in the deadliest accident in aviation history which occurred on March, 27, 1977 when KLM flight 4805 collided with Pan Am flight 1736 on the runway at Los Rodeos Airport (now Tenerife North Airport) on the Spanish island of Tenerife. The collision occurred when the KLM aircraft initiated its takeoff roll in heavy fog while the Pan Am aircraft was still on the runway. There was no ground radar at the airport at the time which almost certainly would have prevented the accident. The impact and resulting fire killed everyone on board the KLM aircraft and most of the occupants of the Pan Am aircraft, resulting in 583 fatalities with only 61 passengers seated in the front section of the Pan Am aircraft surviving the collision. A terrible tragedy that resulted in the installation of ground radar at vitually all major airports.