Yeah, after reading what I've seen on the AA forum I'll definately be doing the challenge on the way home before the DONE4. I'm still a bit torn as to whether I should use the next few months to (easily) get my WP or to almost get my EXP, I actually would like to stay with QF but it's just too hard to ignore the benefits of AA.
The DONE will be in jan/feb so too early for JAL unfortunately, I'll probably take the AA flight and be glad that at the other end I'll be in the land of the onsen.