Las Vegas Sun

June 26, 2016

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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.