A correct fold on the river?

You need 30% equity to call this. Now you just have to start playing with Equilab and put villain on a range and see how much equity you have.
Ax is pretty much blocked but it is still possible, so is JJ. Do you think he will 3 barrel as a bluff here on this board? Can he play QQ,KK like this?

So you need to pay $3,60 into total pot of $11,96, which corresponds to 30,1% of the pot. That means you need to win the pot in 30,1% of cases to make the call profitable (you need to have 30,1% or more equity vs villain's range). Giving him a range (that's the hardest part) in Equilab, you can see if you have enough equity. My guess here is that he will not have a worse hand often enough to justify a call.

I would also fold the river.
I decide by feeling. I just don't think a guy will bluff 3 times with a flush draw or KK.

I agree.
Didn't put villain on a range but I believe he will not play like this with weaker hands.

Pretty gross. Don't hate the fold given the positions. In terms of absolute hand strength hands, you also have some better hands like AQ to call here with.

You have 30%

Originally posted by Dadramel
You have 30%

That’s an easy answer without any range. I would think it’s possible, but he needs to have some weaker hands in his range:
Board: A♠3♠J♥ A♣ 4♦
Equity Win Tie
UTG 48.65% 48.65% 0.00% { KK-JJ, 33, ATs+, KJs, QJs, KsQs, AJo+ }
BU 51.35% 51.35% 0.00% { Ah6h }

Board: A♠3♠J♥ A♣ 4♦
Equity Win Tie
UTG 58.06% 58.06% 0.00% { KK-JJ, 33, ATs+, KsQs, AJo+ }
BU 41.94% 41.94% 0.00% { Ah6h }

Board: A♠3♠J♥ A♣ 4♦
Equity Win Tie
UTG 60.00% 60.00% 0.00% { KK-JJ, 33, ATs+, AJo+ }
BU 40.00% 40.00% 0.00% { Ah6h }

Board: A♠3♠J♥ A♣ 4♦
Equity Win Tie
UTG 75.00% 75.00% 0.00% { KK, JJ, 33, ATs+, AJo+ }
BU 25.00% 25.00% 0.00% { Ah6h }

Board: A♠3♠J♥ A♣ 4♦
Equity Win Tie
UTG 100.00% 100.00% 0.00% { JJ, 33, ATs+, AJo+ }
BU 0.00% 0.00% 0.00% { Ah6h }

Cheers,
SDK1987

And what do you think about calling this pre flop in the first place? We are against UTG, which means strong hand, so when we flop ace we have to worry if our kicker is good enough. And the river is hard, by if we fold PF, we don´t have to be there :). Guys already did math, so we see, we are not good here.

When CO calls too we get better odds. Standard call for me in this situation. Vs UTG alone, I would fold.