I have never had a problem with going beyond security, all I do is show my ID and they let me by without question. It helps to be in uniform, but I have done it a few times in jeans and a T-Shirt, I just wear my ID and show it to them and say I need to talk to the gate agent, or that I am meeting someone and I have never had a problem. I don't fly for an airline either, I am a cargo pilot, but I do have J/S agreements with most carriers. I guess maybe I am just lucky, or maybe it is just attitude, just be nice and friendly and it usually works out just fine.
Good Luck.
SD