Thats not true , F-117A if u think on that plane, when Yugoslav Army shot it down using S-125 Neva or NATO Code name SA-3 Goa, plane is total crushed so remain of that plane felt in some village in Serbia and some of local residents took part of that plane as souvenire, afther comming of Yugoslav MP they took that remain parts and burned it, as we heard. China and Serbia arent in so good relations so Serbia can give them to make research. China had smarter jobs to do.