US Airways Dividend Miles is once again offering an impressive 100 percent bonus for members who buy or gift miles through Sept. 15, 2011. Visit http://www.usairways.com/miles to buy or gift miles. Members will receive a bonus 10,000 miles for every 10,000 miles purchased. The regular rate to buy is $0.0275 per mile. Members can earn up to 50,000 bonus miles with this offer and only members with Dividend Miles accounts that have been open for 12 days or longer are eligible.