I booked my flights for our recent (Dec 9-17) trip back when they were released (or at least within the first week). I purchased WGA fares using my RR points and added EBCI. On my flights to MCO, I was A-46 and A-33. On our flight home, I was stunned to see I'd received B-9 for the MCO to MDW leg. I got A-30 for MDW to GRR so that was fine. I had NO intention of boarding after the wheelchair parade, the A-group and the huge number of families so I opted to pay the $49 to upgrade to A1-15. Thankfully, I was able to get A-9. This was the first time I have ever had a B-group assignment and I am wondering if it is due to the new WGA+ fare class.