CNN's Sarah Brown and Laura Smith-Spark contributed to this report.

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Laura Brown, a spokeswoman for the U.S. Federal Aviation Administration, said in Washington that the agency was checking whether the previous battery incidents had been reported by Boeing.

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There also was no fuel, FAA spokeswoman Laura Brown said.

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"Feedback from the airlines last year indicated they were very grateful the military airspace was available -- it allowed them to fly more direct routes and save time and fuel, " FAA spokeswoman Laura Brown said.

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That notion was a key factor in the Laura Spence affair, he said - when Oxford was accused by the Chancellor, Gordon Brown, of being elitist after Laura, a comprehensive school pupil, failed to get a place to study medicine at Magdalen College, Oxford.

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