Following a month-long shutdown, Lockheed Martin is resuming flight tests on the F-35B, the Pentagon's next-generation fighter jet that has been plagued by delays and cost overruns. The short-takeoff-vertical-landing aircraft was grounded July 30 while engineers examined the plane's electrical components. After a few more test flights in the coming weeks, the F-35B will be grounded for up to four more months while new engines are installed to allow vertical-flight testing early next year.

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