Made my reservation at 602 506 2930 ext1. With that reservation you get a designated spot and access to the 10 lane ramp. You will still have to check in upon arrival, and will have to pay an addition 4 dollars. There is no restriction on when you leave, as the exit lane is open 24 hours. Your reservation is good for 24 hours from noon to noon on day of arrival. I'm in spot B314.