Only use Banco de Nation for currency exchange when at Buenos Aires (EZE) airport. There are two booths at the luggage claim area but their rates are 25% worse than Banco de Nation. Seems criminal, really. Banco de Nation has a location past luggage pickup but before exiting the secure passenger area, but those windows were closed both time we went through. At many airports it is not possible to get good currency exchange once leaving the passenger area, so the temptation may be to use one of the inside booths. Don't! We exited the secure area, and then walked around and into the main part of the bank. You will need a passport; they state they also want to see a boarding pass, but they never asked me for one. Once outside the secure area, you go past several other currency exchange booths, all with poor rates. There is usually a line at the Banco de Nation, but it is worth it. Of course, when exchanging Argentine pesos back to another currency, also go here as the reverse rates are also about 25% worse.