The whole process was so easy. All there was to be done is to get the ticket from the machine at the parking lot gate, park your car in any available spot, and wait for the shuttle to the airport. The email confirmation you receive gives you all the instructions you need and the number you can call for shuttle update status. I called the number for the shuttle arrival and were very clear on what is stated on the shuttle (since there are many shuttles with similar names such as Holiday Inn but different Hotel names). The Driver recognized us from our departure and was great company. Once we returned to our car pick-up location, you will just need to show your email confirmation or print-out and they will validate the ticket from the gate. I would definitely use Book2Park again - thank you for the great experience!