I guess I'm a little late finding out about this offer, but better late than never. This is one of the simpler promotions out there right now - just book any trip on the US Airways website using any MasterCard and you can earn 500 bonus Dividend miles. Use your US Airways branded MasterCard to book any trip, and you can earn 1,000 bonus Dividend miles. You must book between August 1, 2011 and November 14, 2011, and travel between August 1, 2011 and November 30, 2011. There are no limits to how many bonus miles you can earn.
Dividend miles will post 6-8 weeks after travel has been completed, and miles do not count towards Preferred status. There is no need to register for this promotion, it is available to anyone who completes the terms listed above. Click here for full details.