Thanks again to everyone that responded to my earlier posts. The information has been extremely helpful. I have yet another question (sorry!). I am trying to purchase tickets from Rio to Salvador using Gol's website, but I can't for some reason. It won't accept my credit card. It says that I need a CPF number, but I have NO IDEA what that is. I heard that they won't accept foreign Visa cards, so I tried MasterCard to no avail. What do I need to do? I'm leaving on October 19, and this is the last purchase that I need to make before I leave. I'm super-paranoid that I won't get a good flight, so I'd like to get something ASAP. Any advice would help!