PS $27: AKs in the BB

[deagle185]

PokerStars Tournament, Big Blind is t30 (9 handed) Converter on pregopoker.com

UTG (t1200)
UTG+1 (t3160)
MP1 (t1850)
MP2 (t2810)
MP3 (t2880)
CO (t1570)
Button (t1480)
SB (t1780)
Hero (t1420)

Preflop: Hero is in BB with K[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t30, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, <font color="red">CO raises to t120</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, Hero calls t90, UTG+1 calls t90

Flop: (t375) 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] (3 players)
Hero??


I usually reraise preflop w/ AK but sometimes call to mix up. That's what I did here. What's the best way to play this hand? This is pretty early in the tourney so no real reads. I figured to have the best hand judging from CO's preflop raising range. He probably has weaker ace than mine but not as weak as A9, KQ or something similar, or medium to high pocket pair. Bet out or checkraise?