Thanks for the responses. I doubt I'll do it, but it is a bit intriguing.

Anyway, US Airways often sells miles at under 2 cents/mile, and I've been buying them for years to fly NYC to NRT on ANA business class for under 2 grand. Of course that 90K US Airways/Star Alliance award on ANA will now be a 110K award on OneWorld/JAL, but still not a bad deal. Interestingly, the first class seat on the JFK/NRT route using US Airways miles is only 10K more than the business seat, coming in at 120K miles. I might have to try that if I can get availability.