Will be curious to see the future. We just returned from a trip to EZE/SCL and despite my best efforts to fly AR and leverage my DL PM/STE+ benefits, they came in much more expensive than LATAM on both EZE/AEP - BRC and BRC - MDZ (via AEP).
On MDZ - SCL everyone was expensive (since it was OW international even though just a 1 hour flight) but thankfully Avios for the LATAM flight was available.