The most common aircraft used by Aerolineas Argentinas for long haul flights to and from North America or Europe is the Boeing 747-400. If you are scheduled on one of these flights, don’t forget to complete the online check-in and try to choose seats 36B, 36C, 36J, and 36H. This is the closest you will get to Business Class comfort without an actual upgrade.
These seats are located on the widest emergency exit row and provide unlimited legroom because there are no seats in front of them. You could even pull out your carry-on and use it as a footrest. You will also have easy access to the nearby restrooms since you won’t have to squeeze by anyone. Just stand up, take two steps, and you’re there.
I don’t recommend seats 36A or 36K because you’ll be sharing your legroom with the bulge of the inflatable slide on the emergency exit hatch.