Between now and August 31, 2006, every time you use your MasterCard, you’ll receive an entry into a sweepstakes to win 500 round-trip plane tickets. Fortunately, you don’t have to do all the flying yourself–should you win, these plane tickets can be also be shared with friends and family.

In addition, you’ll receive an additional entry if you use one of these airline partner cards. You’ll also earn an extra entry when you use your MasterCard to book a flight with any of the listed airlines. You can earn up to 3 entries per transaction.

For more details and the official rules, see http://www.priceless.com/summerpromo/index.html.