aces in two boards

Hi guys, some hands that I have a doubt with AAxx in rush cash PL0 ,0,02/0,05.

1-Mp open, I SB AAxx 3 bet, mp call. Flop KQJxxy, I don't have this suit, should I check/fold or check/call?

2- Bu pot, SB call , I squeeze, But and sb call. Flop 773r I cbet , SB check raise, should I always fold in a double board like 77+? Looks I never win in this situation. Thanks