Also mentioned- NW hasn't been expiring miles, so they have lots of inactive WP members. WP members will be divided into three groups:
- Active members and elites will receive lots of communication though different channels (e-mail, postal mail) about transition and change-over.
- Inactive members, no activity in a number of years, I don't think the number was clarified, (I'm guessing around 3 to 4 years) with more than 25k miles will receive a couple of communications.
- Inactive members with less than 25k miles won't receive communications.
The last group probably includes a couple million members who joined years ago, took one or two flights, and have forgotten they have an account. The cost/effort to reach out to that last group isn't deemed worthwhile. I think that last group still gets a couple years more till their accounts actually expire.