Northwest has a new “member get member” promotion — and you don’t even have to refer someone that is new to the Northwest Worldperks program.

Refer a friend that has not earned WorldPerks miles for air travel since January 1, 2003. You’ll earn up to 3500 bonus miles for each friend who travels by June 30th, and they’ll each earn up to 3500 bonus miles per roundtrip they take by June 30th.

If you’re going to be flying Northwest or KLM (or Alaska Airlines with a Northwest flight code) before June 30th — and you haven’t credited flights to your Northwest account in awhile — and you’d like us both to earn some bonus miles, drop me a note with your first and last name and Northwest frequent flyer number.

Naturally you can team up with a buddy instead of me for this promotion.