LAN Argentina (4M) doesn't even book domestic revenue tickets earlier than 6 months. I found that out the hard way when a Travelocity booking on LAN for 9 months out resulted in a voided LAN Argentina ticket. Took several calls to LAN to get them to correctly re-issue a new ticket within the 6 month validity period. I think they used to allow reservations within 12 months, but tickets only good for 6. That's where my problem came from. Now I think they don't even allow reservations earlier than 6 months, which at least keeps them in sync with the ticket.

(Note this is just for LAN domestic tickets; LAN international is the standard 330 or 331 day booking, 1-year ticket validity.)

Probably you'll have to call AA right at the 6 month window.

You also can sign up for LANPass at www.lan.com and do a dummy award booking to see what they have available. Also - KVS Availability Tool Platinum now includes oneworld award availability (via Qantas' booking engine) and in "extended mode" it shows some LAN flights, though I don't know about 4M.

Nice airline to fly every time I've been on them. Just quirky in terms of the domestic ticket validity.