Almost always. I play tournaments and the allins preflop are usually later in the tournament from short stacks who are usually pushing a wider range of hands and a lot of lesser aces are usually in that range so it is almost always a call.
Basically, I would move all-in with AK against 1 player. Mostly all the time fold against more then 1, because I don't like getting busted by AA or KK.
I was at the final table of an MTT yesterday and a loose aggressive opponent jammed utg preflop for about 2/3 of my chips. I was in second at the time and holding AKo. I just didn't want to put that many chips in with a drawing hand. I folded in the BB and he took the pot uncontested.
When you raise with AK (suited or offsuited) in cash games and there's a 3bet all in i recomand to fold here cause you're not making money in the long run.
Your equity when holding AKs Vs 99+ is : 41.70%
And like Einstein said: "everything is relative" so you're going to call unless you have got a read on vilain or you HUD shows you that vilain has a high 3-bet % and pushing with any two cards.