[betgo]

With deep money in a major tournament, it is OK to just call with AK. This is also true in a cash game.

With shallow money and bad loose players, you should generally reraise.

I generally like to reraise with AK with deep money in tournaments and cash games. For one thing, I don't want people to know a reraise is QQ-AA. Even if they are not keeping track of me, there is some deception in reraising with AK, as you can represent an overpair on the flop.