I strongly believe that the answer is Ab1v1

I just want to be clear that I was ONLY talking about the ability to pay in pesos,NOT the higher fares for non-residents for domestic flights.

In fact, a non-resident friend of mine has just paid for an international air ticket with Aerolineas Argentinas (the the local office here in Mendoza), in cash pesos, at the same rate as a local who also did it. Because the portion Mendoza-BA was part of a full international ticket Madrid, this part was not considered a domestic flight as it would if it were bought separately. So, the domestic connection portion of an international ticket is not subject to higher rates for Non-residents.

Also, if you want to pay in pesos for domestic flights you can. and is in fact the law that you have to. Some ticket sellers may suggest you pay in dollars at a favorable rate, but the purchase can only be recorded in pesos if it is in cash, and they cannot insist on asking for dollars. Lots of non-resident friends here have paid for domestic flights in cash pesos over the past few months, and clearly did so as non-residents.

I did not know Seacat accepted pesos from non-residents, thanks for the info above. I guess it is just Buquebus who is playing this unsavoury game on the ferrys.

I do want want to muddy waters further, but as I understand the regulation which spurred the closed thread, it only applies to how the FOREIGN credit card or debit card transactions are recorded, that they must be recorded and reported as transactions in the foreign currency of the card source not in the pesos price, to avoid a domestic end-run around the currency restriction and reporting legislation. I have received confirmation from those wiser about Argentine tax laws and accounting than me that that is basically all that is happening, and has little effect on tourists or others using foreign cards (except they may be somewhat less profitable to inventive merchants here in Argentina).

I expect that the thread was closed, as subsequent facts showed that it was much ado about nothing, and we did not need the factually-incorrect heading muddying the waters. I just did not want the reference to the closed thread on this thread to be one that somehow led people to believe that NRs could not pay for things in pesos....they clearly can.