I do not know how my mom does it but she always gets a guest pass to pick me up and drop me off. I have Cerebral Palsy, so it's just easier if I have an extra set of hands. Now my husband has tried to get a gate pass many times to escort me to the gate, it worked once and only once.
I'm not sure if it's because I state that I am disabled on every piece of paperwork possible, or if my mom is just known to be harmless, but I'd try making sure you put on your ticket request thing that you have special needs.