As the U.S. Air Force approaches the fourth anniversary of its B-21 contract award on Oct. 27, the first stealth bomber has entered production inside Northrop Grumman’s Site 4 facility at Plant 42 in Palmdale, California. But the pressure on the development program is rising ahead of a scheduled first flight milestone in December 2021.  Gen. Stephen Wilson, the Air Force’s vice chief of staff, first disclosed the first flight date for the secretive B-21 less than three ...


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