The U.S. government is spending $20 billion to jumpstart the Air Force’s new secret fighter jet, even though it’s still struggling to build the costly F-35

President Donald Trump announced Friday that Boeing will build the Air Force’s future fighter jet, which the Pentagon says will have stealth and penetration capabilities that far exceed those of its current fleet and is essential in a potential conflict with China.

Known as Next Generation Air Dominance, or NGAD, the manned jet will serve as quarterback to a fleet of future drone aircraft designed to be able to penetrate the air defenses of China and any other potential foes. The initial...