Originally Posted by
Grouchy
https://www.delta.com/content/www/en...ml#certificate
For travel on KLM-operated flights marketed by either Delta or Air France, this certificate may be used to upgrade on published fares booked in Y, B, or M class. Fares booked in B or M are eligible to upgrade into O class, while fares booked in Y are eligible to upgrade into Z class.
This conflicts with the wording right above it.
For travel on KLM-operated, Delta-marketed flights this certificate may be used to upgrade on published fares booked in Y, B, M, H, Q, K, L, U, T, X or V class and all fare classes upgrade into Z class. For travel on KLM-operated flights marketed by either Delta or Air France, this certificate may be used to upgrade on published fares booked in Y, B, or M class. Fares booked in B or M are eligible to upgrade into O class, while fares booked in Y are eligible to upgrade into Z class.
Onvipisly should be either KLM or Air France marketed. Makes me wonder if there's more to the error or if they accidentally copied the new KE GUC rules.