$200NL, no read. Calls pre-flop raise, says either pocket pairs or Ax. Flop comes down, he calls a bet. Makes me think he hit the 9 or 4 or has pocket pairs still. A comes down, you 3/4 pot, he calls. Meaning he's not scared of Ace. Either because he has one or you didn't rep like you had one. With your aggressive betting I am thinking you have high PP or A high card. Which he's not scared of the A, so he has A high card beat.
I'm still sticking with A,9,4,T Probably not T