NEW YORK (MarketWatch) -- Boeing Co.'s BA, -0.94% brand new 787 Dreamliner received Federal Aviation Administration approval for United Airlines UAL, +0.09% flights Thursday, allowing the lithium-ion battery-powered airplane to return to the skies, Reuters reported. The approval lifts a three-month ban enacted after the new battery technology overheated in two separate incidents earlier this year, and follows FAA approval of Boeing's fix for the problem last week. Fifty Dreamliners have been delivered so far, which are being fixed at a cost of $2.8 million to Boeing.