Originally Posted by
Fishbait
...don't M and B upgrades come out of the same bucket as mileage upgrades?...
No. Mileage upgrades come from "R" inventory, and M/Bs come from "ZN" or something like that.
ETA: It is ZN, which is this bucket:
Originally Posted by
Continental FAQ
ZN - First/BusinessFirst non-Elite capacity controlled EasyPass reward (tracks similar to Z availability to book)
You normally see much better buy-up versus miles-up availability.