There is an offer under travel. It's different than the one before, so I assume you can do it again. It's 2000 pts for tics over $30, 500 pts for tics under $30.
They are for unreserved seats, so you never have to worry about using them or taking somebody's seat if you don't. If you order, what is it, 10 days in advance, they mail the ticket to you, so there's no extra charge.
I'll have to try the ANA to SNA again for the date mentioned. I had originally picked a different date, but never actually placed the order.
HTH!