Mercosur Passes/Airport Taxes

I have just bought tickets for my trip that will take me see Brazil, Uruguay and Argentina (Mercossur Pass). So, I have been told that I will have to pay airport taxes at each of these three airports before flights. Is that true? What is the procedure? How long does it last?

Well, the procedure is quite simple. When you finish with the check in, you are sent to booth (with your boarding pass) and there you’ll pay. Nothing could be simpler. And they accept dollars! So, I hope you will enjoy this little South American Tour! And it lasts for no more than 5 minutes!