Poker is all situational, never say never.

AA - Situations are so rare you will fold AA preflop, and they all relate to tournament play on the bubble/ITM, its not relevant. Never laying AA down is a good policy
KK - I think you need definite solid reads to lay KK down, generally you can play your entire life without laying KK and not consider it a leak.
QQ - It is read dependant and sitation dependant, take into account that especially early in Sngs when you face two AI's calling with QQ is marginal.
AK - There are tons of situations in which folding AK is correct.