I have used the new Avianca service to Mar del Plata and I have no complaints, not that Avianca is a new airline. It was pretty cheap. Aerolineas has o had some pretty cheap flights to just about anywhere in the country.
Yes. Lapa had issues regarding one pilot who was not in conditions to fly, who was rejected at the semestral test, they falsified the licence and he crashed the plane making the same mistakes as in the simulator
But this new companies are having mechanical problems, this is far too much.