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On 25 May 1979, American Airlines Flight 191, a McDonnell Douglas DC-10-10, lost its No.1 engine moments after take-off at Chicago's O'Hare International Airport and crashed into an open field shortly thereafter. All 271 people on board the plane as well as two other people on the ground were killed, making it the worst single-aircraft air disaster in United States history. The engine fell off because its pylon suffered damage, which was caused by improper maintenance procedures.