ROUTE UPDATES: LATAM Brasil & LATAM Chile - Sao Paulo Guarulhos (GRU) - Bariloche (BRC), Buenos Aires Ezeiza (EZE) - Bogota (BOG), Rosario (ROS) - Santiago (SCL)

* Rosario (ROS) - Santiago (SCL) - eff 01Jul17

Operated by LATAM Chile A320's 4x/weekly.  

* Sao Paulo Guarulhos (GRU) - Bariloche (BRC) - eff 01Jul17 - 30Jul17

Operated by LATAM Brasil A320's 2x/weekly on Saturdays and Sundays for the Bariloche ski season.  LATAM Brasil had only flown this route on a charter basis in the past; this is the first year that it is operating it on a scheduled basis. 

* Sao Paulo Guarulhos (GRU) - Buenos Aires Ezeiza (EZE) - Bogota (BOG) - eff July 2017
    
Two additional weekly frequencies will be added to this route making it a daily service operated by LATAM Brasil 767-300ER's.  

According to Aviacion News, the reason for the EZE-BOG segment being operated by LATAM Brasil is that the air service agreement between Argentina and Brazil allows for "Fifth Freedom" rights, which enables carriers from each country to pick up passengers in the other country and transport them to a third country.  LATAM Brasil does this picking up passengers in Argentina and taking them to Colombia. 

It would normally have been easier for LATAM Argentina to operate between EZE and BOG instead of LATAM Brasil but the Argentina - Colombia bilateral air service agreement only allows for four flights per week by each nation's carriers and Aerolineas Argentinas already operates the Argentine quota. 

Sources:

http://www.siscoma.com.ar/online/aviacion/2017/avn170316/avn-170316.html
http://www.sirchandler.com.ar/2017/02/latam-brasil-volara-directo-bariloche-la-temporada/