Andes is reportedly wet-leasing two A320's from Vueling of Spain for the three-month southern hemisphere summer charter season (January to March). Aircraft are EC-LLJ and EC-JGM which were due to arrive at Buenos Aires Ezeiza Airport (EZE) on December 29 and 30, respectively. The A320's will likely be operated mostly from Buenos Aires to Brazilian coastal resorts.
Sources: Aviacion News and Skyliner website