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The list of aircraft accidents and incidents caused by structural failures summarizes notable accidents and incidents such as the 1933 United Airlines Chesterton Crash due to a bombing and a 1964 B-52 test that landed after the vertical stabilizer broke off. Loss of structural integrity during flight can be caused by: faulty design faulty maintenance manufacturing flaws pilot error weather conditions sabotage (e.g., an airliner bombing or takeover by a skyjacker).