China denies J-20 uses F-117 technology; regards it as outdated

Following widespread reports Chinese agents bought F-117 parts from the jet shot down over Serbia in 1999, China has denied that F-117 technology was used to produce its new Chengdu J-20. A Chinese test pilot has said the F-117's technology lags far behind fourth-generation fighters and was regarded as "outdated" even in 1999.