You've probably heard this one before. I'm on a PDX-AUS RT this week with upgrades. I chose seat assignments on NW.com in First on the return segments, but only the first of two seat assignments shows up on DL.com; the second segment says the seat is not assigned. The seating chart shows my NW assigned seat is taken and gives me the option of choosing a different seat. Called elite desk and was assured that my NW assignment was in their records, but it still doesn't show up on DL.com. Hopefully all will be well, but it seems like something that could be addressed fairly easily.