Las Vegas Sun - Photograph : Grand_Canyon_Ariplane_Crash_June_30_1956

October 21, 2017

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This Sept. 12, 2013, photo released by the National Park Service shows a National Historical Landmark plate overlooking the east end of the Grand Canyon in Arizona where two commercial airplanes crashed on June 30, 1956.

National Park Service / AP

This Sept. 12, 2013, photo released by the National Park Service shows a National Historical Landmark plate overlooking the east end of the Grand Canyon in Arizona where two commercial airplanes crashed on June 30, 1956.