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Цифр и слов "15 more fatal crashes" и "45-year life" в документе FAA как-то не наблюдается.The FAA risk analysis — a document known as a Transport Airplane Risk Analysis — was dated Dec. 3, 2018. It projected that without action, the failure of the flight control system that had brought down Lion Air Flight 610 on Oct. 29 would result in about 15 more fatal crashes during the 45-year life of the 737 MAX fleet globally
Так что это подсчёты журналистов - и как они считали, известно только им самим.