The 50 bonus is not through payusatax. It's a current promo that USAir is running through July 31 for transfers of miles from partners, including hotel partners. You need to register. http://shopping.usairways.com/promot...c=dm_txt_00908

So, if you have a starwood amex, it would work like this:

1) Pay $100,000 using official payments (which drops you to 2.1 percent surcharge).

2) This will give you 100,000 starwood points, which convert at a rate of 1.25/1 to U.S. Air. With the 50 percent bonus that's 180k miles.

To make it work, you'd need to have your starwood amex statement close before July 31 so that the points will post to your account for the USAir promo.

Make sense?