Currently you have to be a Uruguayan citizen, though I believe that Pluna management want to get the governemnt to change that.
Pluna has just received the first two CRJ 900 Next Gen brand new from the factory. There are 7 due to be in service by Jan 2009. They will get rid of other a/c (722, 723 & 757) by then. They also have options on 8 more CRJ and plan to grow from one 767 now to 6 in future. This means they will need more crew and will not be able to get them locally due to being a small country. Hence request to change the law.