An interesting data point is that the seat map shows D1 but when you try and book D1 it says not available. If you try and book FC, the price is higher than one of the actual D1 flights and if you try and select a seat in FC it says that seats cannot be assigned. The only reason I could see it showing as D1 now is that before the schedule change, the flights where coded as J/Z/I/D fares and after the schedule change, DLs best in class IT is getting it confused and is thinking that this is D1 (when clearly it’s not as it’s on a 738)