The US Airways Back-to-School Bonus Miles promo offers cumulative bonuses based on the number of US Airways mileage mall merchants you make purchases with by August 31.

There’s no bonus for buying from just a single merchant, but a 20% bonus for 2 merchants, 30% for 3, 40% for 4, up to a 100% bonus for shopping with 10 merchants during the promotion period.

No registration is required, and all US Airways Dividend Miles mall merchants qualify.

Transactions have to post to your account by November 5 with a transaction date between July 26 and August 31 in order to qualify. And only the first 10 (based on posting date) shopping transactions will earn a bonus. Bonuses will post to accounts on November 5.

This one certainly isn’t as lucrative as the Holiday Shopping promo where 5 merchant transactins earned a 250% bonus, and there’s no “Track-it-Back opportunity” where a merchant is awarding so many miles that the bonus makes it worthwhile to purchase product just to earn the miles.

But it’s a good bonus nonetheless, one that will make me pay more attention to the US Airways mileage-earning opportunities for online purchases over the next month. Though in most cases I find it worthwhile to make purchases via the Continental mall, where my Continental Mastercard earns double miles on all purchases there all the time. But as always it comes down to the specific miles offered in each program for each merchant, something that I use EV Reward to check on before buying anything!