I just used D005297 at DTW & it worked just fine. I reserved last week when I saw the post for it at $175.00. The shuttle bus takes you to Avis. The courtesy driver on the bus has a database and he pulls up your name & reservation if you're a preferred customer and once you get to the lot your name is on the board with space # and you just go and get in your car. All you need is your drivers license on the way out. I would suggest everyone sign up for the preferred service because it's free. No waiting in lines and if you already have a credit card on file you don't have to go in.