Associated Press
Boeing Commercial Airplanes Vice President and Chief Project Engineer Mike Sinnett listens during a hearing at the National Transportation Safety Board (NTSB) in Washington, Tuesday, April 23, 2013, investigating a battery fire aboard a Boeing 787. As airlines prepare to resume flying Boeing's beleaguered 787 Dreamliners, federal investigators looked Tuesday at how regulators and the company tested and approved the plane's cutting-edge battery system, and whether the government cedes too much safety-testing authority to aircraft makers.  (AP Photo/Charles Dharapak)

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