I think AQ has to be included in the range. Have seen people make this play many times before with AQ. I think this problem has to be viewed in the larger context of the tourney. Half the field is gone, above average chip stack, is this the spot you want to play a big pot? For me, its a spot id call in. It lets you see three cards, and also has some deception. AK is not a hand i would give someone credit for if they called behind me after a small reraise. So if a K hits, they may not be able to give you credit for it if they have JJ or TT. Also, if an A hits, and they have AQ, they cant give you credit for the K. And, if they have the dreaded AA, KK it minimizes the chances that you will lose everything. With no reads, calling is my best option.