AK All in?
I may be wrong, but there are many variables to the question. AK while being a good hand is only good if it hits. I would examine table position, and those betting or calling before and after me. In a MTT its not as important to win a bunch at once as staying in to the end. If you are stable in chips, then its better to place maybe a 3 or 4 times BB bet, and if you hit and have the best hand then jam it in. Its not worth getting knocked out of the tourney by some donk that calls with A/2 suited and catches a duece... jmho