There are a few factors to consider.Firstly are we in a cash or a tourney or a sit n go.Second what size chip stack.Thirdly what stage are you at.If tourney early stage fold late stage call.Cash i would tend to call.Also as problackbird says it depends how your luck is going as well.Thing to remember with aces is you will hit flop once in every third flop.Do not get to attached to AK after flop be prepared to fold