AA early in Daily Double FTP - Bad fold on flop?

[toxzen]

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $15/$30
9 players
Converter

Stack sizes:
Hero: $1970
UTG+1: $2610
MP1: $1970
MP2: $1810
MP3: $1890
CO: $1920
Button: $2080
SB: $2070
BB: $1680

Pre-flop: (9 players) Hero is UTG with A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="#cc0000">Hero raises to $105</font>, UTG+1 calls, 2 folds, MP3 calls, 2 folds, SB calls, BB calls.

Flop: 3[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] ($525, 5 players)
<font color="#cc0000">SB bets $300</font>, <font color="#cc0000">BB raises all-in $1575</font>, Hero folds, 3 folds.
Uncalled bets: $1275 returned to BB.

Results:
Final pot: $1125