Favourite against AA? I'm not sure how that can be. You have 18 outs to a flush and let's say 1 out to a straight, and AA has 15 outs to a boat. However, these outs crossover very little (only runner runner, say, 3s, one of which is a club), so basically all your outs are good. So you're roughly 34% favourite against aces. Aren't you?

(edit - I don't have pokerstove on my work pc but twodimes.net says you are only 29% vs AA)