Originally Posted by
Schultzois
Excellent reference.
Reading the section on UuA, I am not sure all eligible booking classes have been listed. I certainly upgraded a CW itinerary in R to F when Z is available. I bookings are not upgradeable using Avios on AA, but I think they may still be on BA (I have in the past, but not recently).
I bookings are upgradable to F (Z) on BA.