Main concern is turn decision, but I'm all ears if you'd play anything else differently.

BU: 76.9 bb
Hero (SB): 100.5 bb
BB: 113 bb
UTG: 198.7 bb
MP: 145.8 bb
CO: 45.9 bb

Pre Flop: (1.5 bb) Hero is SB with AQ
1 fold, MP raises to 3 bb, CO calls 3 bb, 1 fold, Hero calls 2.5 bb, BB calls 2 bb.

Flop: (12 bb) AK9 (4 players)
Hero checks, BB checks, MP checks, CO bets 8.5 bb, Hero calls 8.5 bb, BB folds, MP calls 8.5bb.

Turn: (37.5bb) 6
Hero checks, MP checks, CO raises to 34.4 bb all in, Hero?

Completely readless, but in the site I play everyone is a fish unless proven otherwise.

Preflop I thought about 3betting, but considered that I was comfortable playing this hand MW and keeping their ranges wide.

Flop I thought pretty standard, CO can have many worse Ax, QJ, JT, and very few Kx. When CO checked I wasn't too worried about him, I block some AA and AK and he would also bet some of those (still think he has some combos that can play x/c or x/r so I should be wary).

Turn CO has worse Ax, A9, 99, JsTs, and I don't think much else (maybe QJ or JT, but assumming those might be underestimating V too much). I wouldn't really mind calling if it were just the two of us, but having MP behind makes the decision way harder.

It would be really weird for MP to play 2pair+ this way in multiway, as PFR. Which is why I'm never folding turn AP, guess I'm calling, but it's weird with this pot size.

Seems really hard to imagine MP checking AK/99 on the flop 4-way as the PFR, so I'm calling and reasonably happy about it here.

EDIT: I guess I really should have just quoted the post above with a +1

Call as played squeeze pre

raise pre

squeeze pre

call turn happily, squeeze pre to about 14bb, 13.5 is reasonable and 14.5 is reasonable

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So preflop we should always squeeze this. Having TPGK and a redraw to the nuts on the turn. It looks like a scared set of pocket 99. But whatever we should call here. We need 30ish% against and if we consider everyone goes all in we need even less to break even.
This is against an insanly strong range two pair +

Multiway all in:
http://imgur.com/a/K217H

Against Cut off:
http://imgur.com/a/flvlY

Thanks for the input guys, I called and MP folded, CO had AThh. About the squeeze I almost always go for it, but I guess having the short stack behind made me reconsider, being unnecessarily worried about the scenario where BB or MP call my squeeze and CO shoves.