Grand Canyon crash a game-changer in air travel

Grand Canyon crash a game-changer in air travel

In this Sept. 12, 2013 photo released by the Grand Canyon National Park Service, shows a National Historical Landmark plate overlooking the east end of the Grand Canyon, Ariz. Two commercial airplanes, United Flight 718 and TWA Flight 2 crashed on June 30, 1956 over the Grand Canyon, killing [...]