News Summary: Japanese airlines ground 787s
MORE BUMPS: There have been two emergencies in two weeks involving batteries on Boeing Co. 787s. Japan's two big airlines, which fly a combined 24 787s, grounded their 787 fleets on Wednesday for safety checks.
SPARKING CONCERN: The 787 relies on electricity more than other planes, so the problems with its power system go to the heart of the plane's design.
ON THE RADAR: U.S. and Japanese investigators are studying both incidents to figure out what went wrong. They haven't said how long that will take.
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