The National Transportation Safety Board said Thursday that the football-size hole that opened up in the top of a Southwest Airlines Co. Boeing 737 on Sunday night bore no signs of "significant corrosion or obvious pre-existing mechanical damage."
The report, the NTSB's first on the incident, left open the possibility that some sort of fatigue of the aircraft's aluminum skin near where the aircraft tail attaches to the fuselage could have created the hole.
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