AJs hand on stars

[bxpeter]

This one confused me. I don't have any pokertracker info on pokerstars players. I think the villian is a little loose and aggressive, but probably a good player.

PokerStars 30/60 Hold'em (6 handed) converter

Preflop: Hero is Button with J[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">2 folds</font>, MP calls.

Flop: (7.50 SB) 9[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets</font>, MP calls.

Turn: (4.75 BB) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP calls.

River: (10.75 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, Hero folds.

Final Pot: 13.75 BB

This was a high-speed table and I actually timed out at the end. I could not figure out what he might have here. JJ and A9 (or any 9) seem very unlikely. Would he try a river checkraise with AJ?? The only hands I can think of are 99, 66 (quads??), or maybe QhKh (river checkraise a flush??).

I would appreciate some insight here. Thanks.