JAL Mileage Bank has one of those rather funky promotions for partner airlines where they drop the mileage requirement from time to time. Now it's US Airways.
Just 10,000 miles for US Airways flights under 1,000 miles (one-way).
But this is not a good deal for several reasons. You can use Avios with US Airways now, making short flights really cheap e.g. LAX-PHX is only 4,500 Avios and the flights are just $100 to start with.
So stay away from redeeming JAL Mileage Bank miles for US Airways.