Through December 31, LanChile is offering 5000 points just for signing up for its frequent flyer program, no flight required.
If you’re already a member, the link suggests that updating your account information will get you the bonus as well, although details on this piece are unclear.
They’re a oneworld carrier, and have some outstanding award values. Starwood points transfer to them at 2:1 (with a doubling of the concommitant transfer bonus). For example 60,000 Starpoints yield 150,000 LanPass kilometers
You don’t necessarily want to park miles in LanChile’s program, as points expire in as little as 24 months and can only be extended by actually flying paid flights with LanChile. But it’s a useful program, and 5000 free points is a good start.