US National Transportation Safety Board (NTSB) investigators found evidence of metal fatigue in the left engine of the Southwest Airlines Boeing 737-700 that made an emergency landing at Philadelphia International Airport on April 17 after the pilots initially reported an engine fire, then clarified that there was no fire but that engine parts were missing. A woman died after an apparent engine explosion blew out a window and caused the cabin to depressurize, nearly pulling her from the ...

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