Dennis Fitch, a United Airlines training check airman, learned of the crash of JAL 123 and wondered if it was possible to control an aircraft using throttles only. He practiced under similar conditions on a simulator, and was able to use his knowledge when the aircraft serving United Airlines Flight 232, on which he was a passenger, experienced a similar loss of control through severing of hydraulic lines through large damage near the tail wing. About three-fifths of the people on board that flight survived a crash-landing.