Yesterday LAN began operating a daily B763 service GIG-MIA-GIG. They are now selling RT business class for US$1999, less than half the next cheapest option. For as long as it lasts, not long probably, this is the deal of the decade. It is a full mileage accruing fare. Technically this is a SCL-GIG-MIA flight. I booked it for next week and had pretty good availability. At the moment this flights do not appear on many search engines, and I ended out booking on lan.com, not a very good site. Telephone service is poor too, so you'll not get a lot of help from them. They do not even know what SecureFlight information is so you'll probably need to enter the data when you do online checkin two days prior to the flight. Luckily, inflight service is very good and the seating is pretty good too.