Originally Posted by
carrotjuice
Direct redemption into Business or First class represents the best value, although this is not applicable now that you’ve purchased the original ticket in cash. Not sure if upgrade availability is the same as direct redemptions, if so you may find the similar limited availability to be applicable to both - especially as global travel is ferocious post COVID.
it is - u get upgraded to the same booking classes as direct redemption availability i.e. D and I for advantage and saver respectively and P for Y>PEY upgrade (saver only)