If you are not Argentine citizen you can not fly for an Argentine Airline.
Besides of that, you have to have a Argentine Professional Commercial Pilot Licence (non equivalent in JAR Licences, it is in between CPL/IR/ME and ATPL) with at least 950 hrs TT for working as an Airline Pilot.
For getting that licence, you have to attend to a course for 4 months plus a checkride in a single engine IFR.
The other alternative is to convert an ICAO ATPL in Argentine's PTLA through four written/oral exams in the INAC (National Civil Aviation Institute-Instituto Nacional de Aviacion Civil).
After approving those exams, you have to take a checkride in an
multiengine.
If you are not checking Argentine Aviation, at this moment we are having a lot of problems with Aerolineas Argentinas and Austral because Marsans is dumping the company after leaving it with U$D800.000.000.
More than half of the fleet is on the ground because lack of parts and mantenance.
Our goverment has to take control of the company after paying for more than 6 month salaries for the employees.
So, as an Spanish Citizen, I think Argentina is not the right place for looking for an Airline Job...you can go to Marsans/Air Commet/Iberia.