Boeing 747
August 12, 1985 - Japan Airlines Flight 123 crashed when the rear pressure bulkhead of a 747SR flying from Tokyo to Osaka failed at cruising altitude, severing the aircraft's vertical stabilizer. The pilots kept it in the air for 32 minutes, but it eventually struck Mount Takamagahara and crashed. Of the 524 people on board, only four passengers survived, making it the deadliest-ever single-aircraft accident. The accident was caused by Boeing improperly repairing the tail strike suffered by the same aircraft seven years earlier.