In this Tuesday, April 17, 2018, photo, a National Transportation Safety Board investigator examines damage to the engine of the Southwest Airlines plane that made an emergency landing at Philadelphia International Airport in Philadelphia. A preliminary examination of the blown jet engine of the Southwest Airlines plane that set off a terrifying chain of events and left a businesswoman hanging half outside a shattered window showed evidence of "metal fatigue," according to the National Transportation Safety Board. (NTSB via AP)
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