Boeing's 787 Dreamliner is flying again.
The aerospace company carried out a test flight on one of the planes to try out a new battery system. The entire fleet was grounded earlier this year after a battery on one plane started on fire and another plane's battery began to smoke.
The new system includes insulation around the battery's cells and a steel casing. Engineers will analyze data from the two-hour test flight to see if the redesign works.
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