Any chance that if UA orders new 763s that theyd move the Polaris seats from the oldest 763s to the new ones and then retire the old planes? Are the seats that portable?
They could if they wanted, but it would be a long way off if that were to happen. It would probably be at least a couple weeks worth of mods, especially if walls or lavs need to be moved around. By that point, their strategy with those aircraft may be quite different. Like I mentioned, they could end up running p.s. routes or otherwise operating domestically using the older seats. Fact is, there's nothing wrong with those seats for the stage lengths they're running. They typically operate 6-8 hour routes max. The sCO seat design is certainly adequate, and the seats themselves are only a couple of years old.
If those newer build 763s are going to stick around long term, then they should certainly receive Polaris. However, I would argue that the rest of the longhaul fleet takes priority. The 764s have the same sCO seats, but they're roughly 3-4 years older and will need replacement sooner. The three class 772s need replacement for obvious reasons (even though it'll be sad to see F go), and the two class birds have sCO seats going on a decade old. The 788s/789s have virtually brand new seats, but considering the length of the routes they operate, they need the best product available. Once that's done, if all current 763s are still in service and the newer deliveries will be kept for a while, then I could see replacement being justified.