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1 day ago · On January 10, 1954, BOAC Flight 781, a new de Havilland Comet jetliner, disintegrated in mid-air due to structural failure and crashed off the Italian coast, killing all 35 on board. On June 30, 1956, a United Airlines Douglas DC-7 and a Trans World Airlines Lockheed L-1049 Super Constellation collided above the Grand Canyon in Arizona ...