Party 15-30: AJ against flop call-reraiser

[QuikSand]

I think I made several errors in this hand...

Preflop raiser had ordinary stats - no strong read there.

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Party Poker 15/30 Hold'em (10 handed) converter

Preflop: Hero is BB with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">3 folds</font>, Hero calls, UTG+2 calls.

Flop: (6.66 SB) 5[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG+2 bets</font>, MP3 calls, <font color="#CC3333">Hero raises</font>, UTG+2 calls, <font color="#CC3333">MP3 3-bets</font>, <font color="#CC3333">Hero caps</font>, UTG+2 folds, MP3 calls.

Turn: (8.33 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP3 calls.

River: (10.33 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP3 calls.

Final Pot: 12.33 BB

Results in white below: <font color="#FFFFFF">
Hero has Jh Ac (one pair, aces).
MP3 has Ks Ah (one pair, aces).
Outcome: MP3 wins 12.33 BB. </font>

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Now, I'm thinking that with the flop call-then-reraise by the preflop raiser, I have to put him on at least a better ace than mine. So, I guess folding (or more likely calling and check-folding the turn) is a better play there, yes?

At the time, I thought capping the flop and checking the turn seemed liek giving up too early - but would the fear of a checkraise buy me a showdown with just one bet on a harmless river, with two chances to hit a jack?

Any thoughts? Was capping the flop the big mistake? Or was the big mistake the follow-through afterwards, basically knowing he had a hand he wouldn't fold, which was likely better than mine?