American Airlines Flight 191 was a scheduled commercial flight from O'Hare International Airport in Chicago to Los Angeles International Airport. The aircraft used was a McDonnell Douglas DC-10-10. On May 25, 1979, the aircraft crashed into an open field in Des Plaines, Illinois. All 271 people (258 passengers and 13 crew) on the flight were killed. Two people on the ground were killed and five others were hurt. The crash was caused by the loss of one of the engines, which caused damage to the left wing. The loss of the engine happened because of bad maintenance to the aircraft that had been done eight weeks before the crash. It is the worst plane crash to happen in the United States.