$6+.5 turbo 9 handed
blinds 25/50
3 limpers
effective stacks 1500
I am on the button with Ah10h, I limp, SB Calls
no reads

pot 250
flop AQ9 two spades
BB minbets 50
1 caller, I make it 300
BB calls

pot 850
turn 7 no spade
I bet 450
BB check minraises to 900
I have 700 chips left. Pot is 1750, 450 to call.

Who pushes here(basically same as a call)?
Who checks the turn?
If you check the turn, what is your plan for the river?
Does anybody flat call the flop?

I fold the turn. Usually I raise the flop as you did, putting them on weak hands and if one of them calls, I'll bet the turn as you did. Stacking off w/ TP/MK is not good.