Wreckage of U.S. Stealth Fighter May Have Helped China

Combat Legend F-117 Nighthawk
China may be using American technology in its newly unveiled Chengdu J-20 stealth fighter jet.
The Associated Press broke the news today that Balkan military officials say that parts that came from an American F-117 Nighthawk that was shot down over Serbia in 1999 were likely sold to the Chinese by local farmers who found the wreckage.

Source: Planet Data