Called today to cancel US Airways card. Had already received offer in the mail for 15,000 miles for spending $500/month in Jan, Feb and Mar. Was offered waived AF plus 5,000 miles for spending $1,000 in the next 90 days. I accepted, assuming this stacked with the previous offer as well as the 10,000 anniversary miles. This would net out to an additional 30,000 miles after spending $500/month in Jan, Feb and Mar.

Another poster confirmed that the CRS said the 15,000 miles and 5,000 miles would stack. A few posters confirm receiving 10,000 anniversary miles even though the fine print says those are contingent upon paying the AF. That's crazy, it's like the sign up bonus all over again for free and with no credit pull.

Opened Jan 2014. I had spent enough to hit the minimum spend and then put my card in a drawer until I go the offer in the mail.