Questions about China's airforce

How many Flankers does China have total, including Su-27SK, Su-27UBK, Su-30MKK, Su-30MK2, J-11A and J-11B?

What is the difference between a J-11A and J-11B, more Chinese parts on J-11B (WS-10A)?

How soon do people think it will be before J-10 goes into mass production. Hui Tong maintains that two are being built every month. Do other people agree with that? When might China accelerate production?

Thanks. 🙂