There are certain things you don't want to see out the window when you're sitting on a plane that's taking off. Seeing pieces of the plane fall off - like, say, the engine - are pretty high up on the list. Passengers sitting on American Airlines Flight 191 as it took off from O'Hare International Airport on May 25, 1979, were horrified to look out their windows and see exactly that happen to the engine on the left wing. They would only be horrifed for another thirty-one seconds.