US Airways is running a partner bonus promotion from Sept. 1 through Nov. 15, 2009. Every 4 qualifying partner activities earn progressively more bonus miles. Registration is required.

4 partner credits yields 4000 miles.
8 partner credits yields 8000 miles.
12 partner credits yields 12000 miles and 4000 elite qualifying miles.
16 partner credits yeilds 20000 miles.
20 partner credits yields 30000 miles.
24 partner credits yields 40000 miles
28 partner credits yields 50000 miles.

50,000 miles is the maximum bonus under the promo.

The rules specify that hotel points transfers constitute a partner credit, and you can earn up to 6 partner credits this way. As a Starwood Platinum member I can transfer a single mile. Sadly only one credit can be earned per hotel transfer partner!

This will probably make me redeem some e-Rewards points for US Airways miles, and also steer a single purchase towards the Dividend Miles Shopping Mall (sadly each merchant at the mall does not count as a separate partner). I’ll also swap a single mile from another frequent flyer program into US Airways at points.com, as that will count as a partner. Once I’ve done those things, crediting rental cars and Hilton HHonors double dips to US Airways will making increasing sense for the incremental bonuses.

One nice thing I have to give US Airways a big thumbs up for is that they’ve been explicit about when they will post bonus miles deriving from this promo: “on 10/12/2009, 11/12/2009, 12/15/2009, 1/15/2010 and 2/15/2010.”

There’s a Frequently Asked Questions for the offer and full rules are here.

(Hat tip to the MilesLink newsletter.)