I push every Ace suited no matter what the second hole card is. I call any push when Iam ahead in chips heads up w/A face. We push with almost Q 9 - Ace anything. What makes you think they dont.. Ace/ 2-5 os IMO is not worth using for a call. Calling is different when your not the agressor. If its an instant push, I fold to them head up. If its the last hand before the blinds go up and they are in the SB... You may consider calling.