At reasonably tight tables you can much AT from early position. Axs can be limped from late position but you are playing it for the flush not the straight.

Ax are real trap hands. You wont build much of a pot unless someone has at least a pair of aces (and you will usually be outkicked) so if you flop the ace you can usually take a stab and then give up if you get a call. On very draw heavy boards I wouldnt even take a stab since I wont know where I am even if I get called.