As an addendum, I'm fairly negative about the J-XY. It might end up being a perfectly adequate and capable carrier-based fighter, but think about it another way. It's a F-22/F-35 clone. The success of the J-XY comes out to the failure of the J-20; they're completely different in design philosophy and protocol, and a successful J-XY implies that the J-20 is a make-do aerodynamic formula to cope with limitations as opposed to something innovative. That's to say, the Americans do it better, and the future of Chinese aerospace design should be to continue aping the Americans.