FTP $24 - overcall with AA on a dangerous flop?

[alex-star]

Both villains are unknowns. No reads except that the shortie lost most of his stack in an early coinflip.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t30/t60
9 players
Converter

Stack sizes:
UTG: t1215
UTG+1: t1345
Hero: t1695
MP2: t1350
MP3: t1530
CO: t3015
Button: t1380
SB: t1230
BB: t740

Pre-flop: (9 players) Hero is MP1 with A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img]
UTG calls t60 <font color="aaaaaa">(pot was t90)</font>, UTG+1 folds, <font color="#cc0000">Hero raises to t220</font>, 5 folds, BB calls t160 <font color="aaaaaa">(pot was t370)</font>, UTG calls t160 <font color="aaaaaa">(pot was t530)</font>.

Flop: J[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (t690, 3 players)
<font color="#cc0000">BB is all-in t520</font>, UTG calls t520 <font color="aaaaaa">(pot was t1210)</font>, Hero??