Reservations are not necessary.  We have open & covered space available 365 days a year, even on Christmas!  We have thousands of spaces open and shuttles always standing by to take you to the airport whenever it is that you arrive.  24/7/365.  Despite this we are working on a reservation system we expect to launch later this year.  This is due to the overwhelming desire of our guest for the ability to make a reservation.  We are listening to you and working on it.