Behind security? Don't hold your breath. There's a pretzel stand and maybe one other small thing. Outside of security is a quite different story -- right outside AA there is (IRC) a Burger King, Au Bou Pain, etc., and then just about a four minute walk towards United will lead you to the food court.

Edit: Check out for yourself: http://www.panynj.gov/CommutingTrave...g_retails.html