WASHINGTON and BEIJING — China’s newest combat aircraft prototype, unofficially tagged as the J-20, made its first flight shortly before 1 p.m. Beijing time on Jan. 11, ending three weeks of anticipation as to when taxi tests would begin on the new stealthy design that surprised U.S. intelligence officials. But one issue surrounding stealth designs is how long they can continue to offer protection as air defenses adopt even larger and more powerful advanced electronically scanned ...


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