It is a short walk (10 mins) after you leave the secured area. You can loop around either way - through the Int'l terminal (go right when you leave UA) or the other way (through "closed" Terminal 2 - you can walk through). You must leave the secured area. The peoplemover system isn't open yet, but there are buses that loop around, which seem to me like a waste of time if you are able-bodied. The best restaurants in the airport are in the Int'l terminal, but most are past security (and you can't get in). The AC gate area is lacking for decent eats. I have heard that that side isn't as efficient with security lines (the UA side is good). Maybe someone will give you a heads-up on that. I'd eat prior to going through security for the gates in the #20s (where AC is).