Hello from PUQ! Fly to MPN tomorrow - exciting
I gave up on the rewards (Avios) flights for this sector - there was nothing at all available even after phoning BA. Plenty of availability SCL-PUQ but no further!
I ended up booking a cash ticket from GRU via SCL - really cheap if you night stop in PUQ on the outbound - Matrix is your friend here
Good luck and safe travels