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However, the flights both ended up at an altitude of 21,000 feet and collided over the Grand Canyon. It was also highly unlikely that the airplanes themselves would actually be at the intersection of the flight paths at the same time. Although the flight plans called for the flight paths to cross, the planned altitudes differed by 2,000 feet. The flight paths were planned to cross near the Grand Canyon, at the Painted Desert line of position as the Kansas City flight routed back south and the Chicago flight routed back north. The airliners had both taken off from Los Angeles International Airport that morning only three minutes apart. The TWA flight to Kansas City departed first and initially routed north, while the United flight to Chicago initially routed south. Photo copyright Michael Haywood - used with permission It was a catalyst for changes to the air traffic control system and led to the creation of the Federal Aviation Agency. This accident involved two of the largest commercial aircraft in service and was the deadliest aviation disaster in history at that time. There were no survivors among the 128 persons aboard the flights. On the morning of June 30, 1956, TWA Flight 2, a Lockheed Super Constellation, collided with United Air Lines Flight 718, a Douglas DC-7, over the Grand Canyon. Photo copyright Michael Haywood - used with permission Grand Canyon, Arizona June 30, 1956 United Airlines Flight 718, N6324C TWA Lockheed 1049A, Super Constellation

Data & Research Subnav: Data & Research 1.Airport Safety Information Video Series.

Passenger Facility Charge (PFC) Program.Airport Coronavirus Response Grant Program.General Aviation & Recreational Aircraft.Vintage & Experimental Aircraft Program.Aviation Safety Draft Documents Open for Comment.