I replaced my anti-air missiles with zuni rockets on my AA-tank.
I can track and take down pretty much any jet, helicopter, or flying quad bike pretty much instantaneously upon sighting them.
AA tanks are basically my replacement for the IFV, which fails to kill infantry and vehicles at the rate the AA-tank can do it.
I am also an ACTIVE anti-air tank, I don't understand why some players are content to leave that monster of a killing machine in the in-cap where it can barely hit anything useful, I take mine on a stroll to go surprise destroy heavy tanks and light tanks, and pepper those stupid snipers with some fabulous 30mm rounds.