I rarely disagree with Rolf...but this is one of those times. Very very few players online will play as the AA suspect does here and NOT have AA. It will only be a maniac/tilter who would, and you should have a view of that from prior play.
TO say NEVER to pass AA online is not quite true. In about 40k hands or so I've passed it once, and then it was very marginal and probably a mistake. What is true is that you are never going to be making a huge error by always calling. What is also true is that you may be only marginally in a good spot, if at all, and do you intend to pursue all 1% edges for all your stack?
For an example and some debate on this, check out
here