The Southwest Airlines 737 jet whose roof ripped open in midflight may have had a defect that dated back to the assembly line more than a decade ago, ABC News has learned exclusively.
After the April 1 incident, investigators found widespread cracking in the metal fuselage. The initial thought was that the cracks were caused by metal fatigue, a result of the plane's 39,000 takeoffs and landings.
But now it appears it could be a problem in production, sources said. The plane was manufactured...Full Story