Wish I could help. First time using that site will be on the 12th Sept. I do hope all goes well if you're flying into CUN. My partners colleague just got back Stateside after doing the ferry. Says he had to kill 5 hours before his turn on the ferry.. I've never done it but that is not how you want to start off vacation. If it's true I wish you luck and just think of happy vacation thoughts....better than locked up at home.