How many people were dealt into the hand?
If this is 6+ handed I don't think UTG's flop calling range needs to be much wider than {99-QQ, AQ, A
x
(3)
#33}. When you bet again on the turn, he can pretty much just fold AQ, and do some combination of calling and raising the rest. (JJ > AQ from his perspective, I think.)
Even if he's a lot looser than that, blocking combos of AQ isn't good...seems like we can c/c the turn and then c/flip coin on the river pretty safely here.