Everyone knows that when you get ace king suited, the flop is going to be low cards of a different suit. That's why you always fold every hand except for deuce 7 off suit. That's the only real winner.
Both. Ace + king in blackjack = 21 points, which is a winning hand. Depending on the specific rules you're playing with, if they're both spades then it's called a "blackjack" (same as the name of the game) and beats other combinations of A+K.