Well, I thought I knew it all. To keep Silver status under the current promotion, I need to fly 8 segments within 4 months. I just found out that segments only count if you book Economy Classic fares, not Economy Light. I really didn't think to check this, because Miles & More offer segments on the cheapest fares at LH and LX, as well as at EW and 4U, namely HBO fares.

I've got quite a few Economy Light bookings coming up. Is there any way to upgrade to Economy Classic at this later stage? EW and 4U allow you to upgrade before check in and aggressively advertise that fact. Possible with AB?