Also,if you are pooling miles from the two airlines, you have to use the award chart on USAirways' web site(check Dividend miles --> Partner airlines). You'll see that there is a 125,000 mile award for first class to asia, but no 200,000 point award for 2 first class tix. You'll have to spend 250,000 for two.

I had the same problem on a recent trip to Buenos Aires. I pooled points from both accounts and had to use the USAir charts. I wanted to use an AA award for 2 business class tix, which were cheaper than 2 individual seats, but they wouldn't allow it.