I am having difficulty purchasing ticket online. I am trying to use this one site Despagar.com. The site is great, but when I am trying to buy my ticket one of the questions is what is the RUT number of the card holder. It will not let me go on until I answer it. I am from the united states and do not have a RUT number. I tried my SS number and my pasport number, with no luck at all. Has any one had this problem? If so how do I get around it. Thanks in advance!