I noticed the equipment changes because I booked these flights recently, so I can still remember the finer details. I guessed wrong on the Thanksgiving flights...they have been updated where the flight number changed, but still operated by Pinnacle. The Christmas mainline downgrades where obvious to me because they now show as being operated by DL Connection carriers.

I'll call SMS tomorrow. Hopefully I'll get a sympathetic agent who will throw me a bone and give me some favorable changes.