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Mayday: Air DisasterExperts investigate the collision of two planes over the Grand Canyon in 1956, uncovering a frightening problem that threatened the entire aviation system.

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Now PlayingMayday: Air DisasterExperts investigate the collision of two planes over the Grand Canyon in 1956, uncovering a frightening problem that threatened the entire aviation system.0Mayday: Air DisasterWhen a private Learjet veers onto an unplanned trajectory en route to Dallas from Orlando, it's clear something has gone terribly wrong.