Originally Posted by
findark
Expert Mode is the most reliable source for United inventory (especially proprietary inventory). The "search for upgrade" tools aren't as good.
I use Expert Mode whenever it is permitted, and I would still start my search for an upgradeable fare by searching for a GPU upgrade; however I do look at the list of available fare classes. If that is what Kacee meant, I agree. If not, is there another way to search that I am missing?