Originally Posted by
Kacee
That's just a guess. It may be a good one, but it's a guess.
I know from personal experience getting into the GFL at SFO that UA considers saver awards "full fare" such that an I ticket would get you in where a Z or a P would not. Saver awards also fully changeable without restriction, which is another characteristic of a full fare ticket.
I would guess XN is lower than revenue classes, but only because they seem to have correctly implemented XN CPUs.