Originally Posted by
StayingHomeIsBetter
If you qualified before the policy was changed (sometime in the mid-1990's), you are grandfathered into the lifetime category... until you qualify for the next higher tier.
I'd have to check the letter, but I think back then it said "for the life of the SkyMiles program", or some such weasel-words. All DL has to do is re-brand SkyMiles as SkyMiles 2.0, and they could end the "lifetime status" . I doubt that the pre-90 MMs are putting much stress on the system, though.