When purchasing a ticket online with a US carrier, originating in BUE for travel to the US, and using a US issued credit card, select the US as your country of residence when making the reservation. I just booked a flight from BUE to NYC on American, for travel the middle of June, for a fare of approx US$1190.00, with a total tax of approx US$176.00. That is the same tax amount collected last October for a trip I made to NYC in December. This total tax amount does not include the 20% Argentine income tax surcharge in either case. If one's US credit card is issued in the US, with a US billing address, then there's no reason that one cannot indicate their country of residence as the US. Again, this is for online ticket purchases only. I know it works with American, not sure about United or Delta.