As mentioned upthread, UAUA contained non-IPTE converted frames to fixed routes. Even on a shoestring it can be done. And having the newest product protected on ULH should be easy - all but 4 789s have it! And don’t forget the curious decision to prioritize updating the -8 before the -9, that is all on UA.
btw, saying the old PMCO seat is comfy isn’t relevant - UA’s decision is to eliminate it. That isn’t being revisited.