Well, most of the time this happens when I play with my friend. Anyway when he airdashes at me, he uses J.B but for some reason I've repeatedly hit him with 6A. I think it's because 6A has head invincibility. But then again, I may be wrong. I've just now started to use 6A as an anti-air so I have no idea how reliable this is.
I need to work on that combo...The only one I can do without a problem is his one of his BnBs... Oh, and loops.