16: Push this KK on Ace flop?

[loxxii]

PokerStars Tournament, Big Blind is t100 (7 handed) Converter on pregopoker.com

UTG (t925)
UTG+1 (t3675)
MP1 (t2630)
CO (t1645)
Button (t1475)
SB (t1730)
Hero (t1420)

Preflop: Hero is in BB with K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t100, <font color="gray">MP1 folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, <font color="red">Hero raises to t400</font>, UTG+1 calls t300

Flop: (t950) 8[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 players)

Too short to c-bet, so push or check/fold?