Originally Posted by
dbernie41
My outgoing leg of DTW-NRT is booked as V and my return NRT-DTW is booked as X. Not sure what these mean or allow regarding upgrades.
Y - Main Cabin (in general, not fare class)
PS - Premium Select (AKA Premium Economy)
D1 - Delta One
Your fare class doesn't matter for GUC eligibility. (except for E fares obviously) If you want to upgrade to PS from Y and clear, you will need another GUC to UG to D1. Since you just want to go from Y to D1, you only need 1 GUC, not 2.