WorldPerks is matching all car rental miles with Mileage Accelerator
Rev up your WorldPerks account! October 1 - December 31, 2003, Northwest Airlines will match all WorldPerks miles, including Bonus Miles, you earn from Alamo® Rent A Car, Dollar Rent A Car, National Car Rental® or Thrifty Car Rental. Register first, then hit the road with WorldPerks car rental partners and earn hundreds or thousands of additional miles!
Click here
http://www.nwa.com/promo/accelerator/
and enter registration number 8045.