However, since you get to choose the car you want from the category you booked, you can wander around and try to find a car that has it. However, do actually sit in the car and crank it and then push the XM or Sirius or SAT button and make sure it works. Some cars are not activated and only one channel will come in. Major airports let you choose your car including MCO. But I've been to some cities such as Jacksonville and Pensacola where they choose the car for you.