Originally Posted by palmanfr

I know that there used to be some fifth-freedom flights on KLM between EZE and SCL and Air Canada also was operating the route. I am pretty sure that KLM still does it almost daily, not sure about AC.
Aerolineas Argentinas flies the route from AEP airport (closer to Buenos Aires than EZE), good if you can book using Skyteam miles for cheap, but don't expect much service. Jet smart and some other low cost airlines also fly the route.
I thought that to book award flights on LATAM using avios since the departure from OneWorld, you would need to call BAEC (cannot be done online anymore)