playing with AA in 3bet pot against top regular

Call. There are only few velue hands in his range: TT, T9s, some combos QQ. I don't think he would call to many flush-draws to river (we have blocker A♣: ).

river AFq is low, but he can overplay AQ0 and s or KQs here - many combos worse than our.

We need only 30 % equity for profitable call and we defenetely have it!

Finding a fold here is pretty hard, but then again finding bluffs in his range is even harder.

I would've probably (as played) bet this hand myself on the river, his low AFq tells me he's not stabhappy, nor is he going to vbet light. By betting he can still call with JQ/KQ or other 1pair hands that would've otherwise checked behind.

I think an x/c on the flop is a better option, After the flop hits we have 2 streets max and need to exercise pot control.
Checking keeps his range wider and protects our checking range.

As played; I think we have to fold the river. I don't see him betting this with anything we beat. In theory it's a call but in practice, at these limits, i'd prefer to nit it out.

Thank you the cool answers. These are helped me. I am a little bit tight on the river when I need to decide about one questionable call.

How big is the hand sample of villain?

I would prefer fold otr. He won't bluff on this river enough. Otf you can use maybe smaller sizing. And I think otr we can try thin value bet and fold to raise, but I am not sure about it but it looks reasonable, we will get a call from Qx hands, sometimes Tx, hands which he will usually check back.

hmm 18/15 seems like a complete nit to me, so I wonder if he'll value bet QJ like that. You also block flushes with the ace blocker and you beat QT.

I would also strongly consider value betting river, if he's unable to pay your Aces off then he's either too nitty or you are too nitty with barreling rivers. And when I want to value bet myself, there's no way I'm checkfolding. Also given his bet size it makes him much less likely he's super strong and more likely to have QT/QJ