I've been watching SCL-JFK like a hawk. I'm looking to use Avios points before they devalue for a flight in late Feb 2016. the pattern is 330 and 329 days out it seems. At 330 days out I see 7 Y and 7 J every single day. 329 varies a bit, but is roughly the same. Then it rolls forward each day. Not much of a window, but it's nice and predictable.

My only risk is getting stuck with these Avios points. I'm booking 2 J seats. Has anyone had problems booking LAN flights using Avios? I read up there that CFFrost was having difficulties when the booking time actually arrived. Has me alittle worried.