Unimproved AKo in a huge pot....did I play it right?

[Bandgeek]

B&M game at a local riverboat casino.
Table has been pretty loose passive with an average of 5+ players seeing each flop.
4-8 Holdem
UTG live straddles for $8

UTG+2 cold calls two bets.
In MP I look down at A [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/club.gif[/img] and raise it to 12.
The guy in the cutoff makes it $16 to go.
UTG calls two more bets, and the EP caller caps it at $20.
Everyone calls the cap.
Flop comes (pot has 21.5 SB)
T [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/club.gif[/img]

UTG checks
EP bets $4
I call
CO calls
UTG calls
Turn comes (12.75 BB)
9 [img]/images/graemlins/heart.gif[/img]

UTG checks
EP bets $8
I call
CO raises to $16
UTG folds
EP calls
I call
River comes (18.75 BB)
9 [img]/images/graemlins/diamond.gif[/img]

EP checks
I check
CO bets $8
EP calls
I call

Total pot $150

Results in white below
<font color="white">EP shows KK for a full house 9's over K's
I of course have AKo for just trip nines

CO shows Q9o for quad nines </font>

Would you have played this differently?