Southwest says inspections turn up cracks in additional planes

" A senior Boeing engineer said the company was surprised by Friday's rupture of the roof of a Southwest Airlines Co. jet because Boeing didn't expect cracking in the aluminum skin of such planes for many more years.

Paul Richter said Tuesday that metal fatigue that led to the hole in the plane's roof had nothing to do with Southwest's heavy use of its planes."

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Note:  look up the Al Jazeera video on this here - whistleblowers warned about this.