Air Crash Investigation - Grand Canyon Collision (United Airlines Flight 718 and Trans World Airlines Flight 2)

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On 30 June 1956, United Airlines Flight 718 and Trans World Airlines Flight 2 collide in mid-air over the Grand Canyon in Arizona, killing all 128 people on both aircraft. At the time, it was the deadliest-ever aviation accident, and would lead to major changes in the regulation of flight operations over the United States.