Keep an eye out on the emails you get from Barclays. On one of the four accounts we have we just got an offer for 500 miles for switching to paperless statements.

"Sign up for Paperless Statements on your US Airways MasterCard® by March 31, 2013 and get 500 Bonus Miles.

The bonus miles will appear on the cardmember's statement up to 6-8 weeks after the end of the promotion."