10NL - A9s misses flush but hits 3rd ace on river; faces big bet

[bober2]

How should this be played?

PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($10.15)
UTG+1 ($4.65)
MP1 ($8)
MP2 ($6.05)
Hero ($15.45)
Button ($17.40)
SB ($10.70)
BB ($1.80)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
UTG calls $0.10, <font color="#666666">2 folds</font>, MP2 calls $0.10, Hero calls $0.10, Button calls $0.10, <font color="#666666">1 fold</font>, BB checks.

Flop: ($0.55) 2[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, <font color="#CC3333">UTG bets $0.3</font>, MP2 folds, Hero calls $0.30, Button folds, BB folds.

Turn: ($1.15) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $0.4</font>, Hero calls $0.40.

River: ($1.95) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $9.35 (All-In)</font>, Hero calls $9.35.

Final Pot: $20.65