Just playing AA in plus is not enough. We must always make sure that we win the most with aces when we are ahead, and of course avoid AA comparisons with sets that have been closed on the river by the flush, etc.
AA is always nuts preflop, so play it properly. I mean open-raised, three-betting, and if someone gave you a chance to compare pre-flop - of course do it.
Open with a raise. If there were limpers, isolate them (4-5bb on average). If there was a raise, do 3bet (about 3-4 times his raise). If you were given 3bet, put 4bet, to 23bb, and gladly call it push. If he calls my 4bet, automatically put all-in on any flop (unless, of course, we play not in dip stacks of 400bb).