It's a self park system, don't need to give anybody your keys. There's a shuttle bus that picks you and others up from your parking stall and takes you to the airport (5-7mins) Probably one of the cheapest out there, and it does the job. Payments are done after you return from your trip. They take debit, credit and cash, plus they also take ama and areo plan. I offered to walk to my car, but the shuttle driver insisted to drop me of at my car, which was very nice of him.