AKs and AKo are 
drawing hands preflop. They should be folded preflop accordingly generally because you can't 
tell the difference between an 
AA (almost 
drawing dead), 
KK (basically 
drawing dead), or 
QQ (still a little less than a coinflip) 
all-in. I cannot imagine a 
call with AKs/AKo against any reasonable opp's preflop 
all-in over a large sample of hands would be +EV for this reason.
AA is not a drawing hand preflop (never folded).
KK is not a drawing hand unless it's against 
AA preflop (1 out of 23 times or better, I think, so folding it is kind of absurd most of the time, i 
never fold it anyway).
QQ is not a drawing hand unless it's against 
KK or 
AA and hardly better than a coinflip against AKs/AKo (1 out of 11 times or so or better, i 
fold this against two all-ins or a 
tight player's 
all-in).
This applies to any no-limit game (
SnG or ring). A 4bet preflop in a limit game I'll play AKs for 
flush draws or aces/kings paired or both given 
community cards.