Route is PSC-MSP-BOS, flts 4714, 848 on 5/11. Right now I am on the upgrade list for 4714 twice, at #1 and #5. I am #8 for 3 seats on 848. I was #8 before I called to use the RUC, but the call caused the additional message about being waitlisted on the trip screen for 848. Still somewhat confused. Guess I will have to call.