re: Poker & Calling/floating with air to steal Advice....
I personally look for players that have a big drop off between their flop and turn c-bet percentage and play fit or fold on the turn and river. I look to play pots with them in position and take the pot away later in the hand.
But I do not necessary float flop c-bets with air. I will float with gutshots, pair plus gutshots, backdoor straight draws, or bottom pair. Basically any flop where I have some kind of equity and look to take it away when they check to me in position on the turn.