Originally Posted by
JBJ2435
I get the first one, I can upgrade to F with an RUC, but does the other two mean that I can apply a GUC and clear all the way to D1 from main cabin?
Global Upgrade Certificate Availability
Refundable First Class available (LAX-DTW)

Refundable Premium Select available (DTW-MUC)

Refundable Delta OneŽ available (DTW-MUC)
No.
That means you can upgrade to PS from Main with a GUC.
Or you can upgrade from PS to D1 with a GUC,
if you buy PS.
There is no longer a way you can go from Main to D1 except at T-24.