Good catch, Kristen! I am pretty sure that is new (as it says, effective 8/1/06). Our FF miles are with AA, and my previous understanding was that ATN was an award-only partner, not mileage-earning. So this gives us more options.
As far as earning credit for RSSC air flights, maybe, maybe not. On "bulk" or "group" fare tickets (non-RSSC), sometimes we have automatically gotten mileage credit, sometimes not. Depends on the booking code/class of service that is used. It might be a good question for RSSC, to see if they will commit one way or the other.
Dena