My gf is a fairly infrequent flyer (less than 10K miles per year domestic and one or two visits to family in Morocco per year), but is taking ANA to Jakarta with the routing IAD-NRT-CGK in Z class. This business class RT is ~20,600 miles total.
Any ideas for best airline to credit? She has been USAir to date, b/c of the good options out of DCA, but I'm wondering if she can quickly get to *G with just this one routing?