Cause Of Boeing's 787 Problems Remains A Mystery

NPR | Jan. 25, 2013 11:37 a.m.

Contributed By:

Wendy Kaufman

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Federal safety investigators still don't know why a battery on a Boeing 787 burst into flames earlier this month in Boston. The Dreamliner is grounded worldwide. At a briefing Thursday, the head of the National Transportation Safety Board warned it could be a while before the planes return to the skies.