Boeing says about forty of its Dreamliner seven-87 aircraft still in production have hairline cracks on their wings.
The company emphasized the 122 jets already in service are O-K and none of them were affected. The cracks are expected to take between one and two weeks to repair. The Dreamliner has suffered some teething problems since entering service in 2011, three years behind schedule. Last year, lithium-ion batteries overheated on two Dreamliners, prompting regulators to ground the fleet for more than three months.