Update: The version of this offer that gives 10,000 anniversary miles is for US Airways Dividend Miles elite members only. There have been numerous reports of non-elite members being automatically denied when applying for this version of the offer.
Barclaycard has just enhanced their US Airways credit card offer. They are now offering 50,000 miles after first purchase (previously 40K). That’s a fantastic offer considering that there is no minimum spend requirement. The $89 annual fee is not waived the first year.
US Airways Preferred members (and others willing to risk it) can sign up for a special offer that gives 10,000 additional bonus miles on the first account anniversary. In the past people have found that they can still cancel the card after the miles post in case they do not want to keep the card through a second year.
Keep in mind that these miles will become American Airlines miles in the second quarter of next year. So, you can earn a total of 150,000 miles at once (plus 10K more, later) by signing up for the US Airways card and the two current American Airlines cards offering 50,000 miles each.