SAFETY
Visual Failure Blamed in Canyon Crash
At approximately 1031,1 June 30, 1956, a Trans World Airlines Lockheed 1049A, N 6902C, and a United Air Lines Douglas DC-7, N 6324C, collided at about 21,000 ft.2 over Grand Canyon, Ariz. Both aircraft fell into the Canyon near the confluence of the Colorado and Little Colorado Rivers.