Associated Press
Boeing Commercial Airplanes Vice President and Chief Project Engineer Mike Sinnett listens at left, during a hearing investigating a battery fire aboard a Boeing 787, Tuesday, April 23, 2013, at the National Transportation Safety Board (NTSB) in Washington, Tuesday, April 23, 2013. At right is NTSB chair Deborah Hersman. (AP Photo/Charles Dharapak)

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