The planes have since been modified with new battery systems and have been given approval to fly again by the US Federal Aviation Authority.

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Boeing did not add to its existing comments on the investigation into the fault, repeating that it was co-operating fully with the US Federal Aviation Authority.

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No one was seriously injured in any of the events, and the National Transportation Safety Board, an independent federal agency charged with investigating civil aviation accidents in the US, and the Federal Aviation Administration, the national aviation authority of the US, have ordered investigations into the incidents.

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