Right now it costs 5,000 miles to upgrade to first class on one leg of a domestic US Airways flight. Beginning in October, that price will jump to 15,000 miles.
Effective October 3, 2007, all one-way upgrades within the contiguous U.S. / Canada / Alaska will require 15,000 miles. All one-way upgrades between the contiguous U.S. / Canada / Alaska and the Caribbean area / Central America / Mexico or Hawaii will require 17,500 miles. All qualifying one-way upgrades between the contiguous U.S. / Canada / Caribbean area / Central America / Hawaii / Alaska / or Mexico and Europe will require 30,000 miles.
Looks like I have yet another reason to stop being a loyal US Airways customer.