[Ribbo]

The chance of someone having the nut flush draw is 15%, the chance of one of the other two having a naked ace on that flop is also 15%. In the case of the naked ace, I would jam with it to get other non nut flush draws to fold if I have some other hand like AQ or a set on the flop.
I believe QQ99 HAS live cards on that flop 3 handed, whether it be the Q9 or the flush draw. The chance of AQ and nut flush draw being out there I put at maybe 7%. This would give you live cards and put a 3 ways shove odds for you at around 33% worst case scenario. Best case scenario is they both have a set and you have them dicked over good style. Either way with the money already in the pot (you only need around 30% equity on that flop to break even) I would call.