What should I have done with this AA?

[smartalecc5]

Ultimate Bet No-Limit Hold'em, $.25 BB (10 handed) converter

UTG ($9.60)
UTG+1 ($40.40)
UTG+2 ($28.95)
MP1 ($3.40)
MP2 ($9.75)
MP3 ($23.50)
Hero ($12.55)
Button ($21.25)
SB ($6.30)
BB ($9.75)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls $0.25, <font color="#CC3333">UTG+1 raises to $1.1</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to $3.9</font>, Button calls $3.90, <font color="#666666">2 folds</font>, UTG calls $3.65, UTG+1 calls $2.80.

Flop: ($15.95) K[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
UTG checks, <font color="#CC3333">UTG+1 bets $1.25</font>, <font color="#CC3333">Hero raises to $8.65</font>, Button folds, UTG folds, UTG+1 calls.

Turn: ($18.45) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

River: ($18.45) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: $33.25

Results in white below: <font color="#FFFFFF">
UTG+1 has 7c 7h (three of a kind, sevens).
Hero has Ah Ac (one pair, aces).
Outcome: UTG+1 wins $18.45. </font>

I was agressive in every round- was it correct of him to play it past the flop?