Early in a Sng, was wondering if I played this flop well. Tried to send out a smallish bet to make it look like I was slowplaying a ace. Thought if I got re-raised then I was behind in this hand. The call by UTG and the ace on the turn almost made me think that I was ahead but I was too scared to bet the turn. How do you guys play this flop?

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero (t1500)
UTG (t1490)
UTG+1 (t1770)
MP1 (t1540)
MP2 (t1470)
MP3 (t1480)
CO (t1170)
Button (t1460)
SB (t1620)

Preflop: Hero is BB with K, K.
UTG raises to t90, UTG+1 calls t90, 6 folds, Hero raises to t300, UTG calls t210, UTG+1 calls t210.

Flop: (t915) J, 4, A (3 players)
Hero bets t210, UTG calls t210, UTG+1 folds.

Turn: (t1335) A (2 players)
Hero checks, UTG bets t210, Hero calls t210.

River: (t1755) 9 (2 players)
Hero checks, UTG checks.

Final Pot: t1755

__________________
"On a large enough time line, the survival rate of a Donk will drop to zero."

I'm not sure I would bother betting out with 200 into a 900 pot, I prefer checking or betting 600. The trouble with a 215 bet is you could easily get raised as a bluff because it looks so weak and possibly even get hands with a gutshot straight and runner runner flush draw calling.

I probably check, noone can possibly be drawing to any more than 5 outs and so keep the pot small. If it checks around assume you are ahed on turn, if it goes bet, raise or bet-call you can probably fold.

why bet 210?

if you are going to bet like that you might as well check.

as played, call the turn, and beat KJo or TT.