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Raymond P. (Jack) Parshall (c.1894 - May 14, 1973) [1] was an American pilot [2] and air crash investigator who became lead investigator for the Civil Aeronautics Board. Investigations that he led include the bombing of United Air Lines Flight 629 in 1955 [3] and the 1956 Grand Canyon mid-air collision. His report on the Grand Canyon collision resulted in major changes to air traffic control in the United States. [4] [5]