The name "Royal Pacific Service" went the same way as "Concierge Class" - a name United once tried for its business class (C). I think that the name - at the time - was too sophisticated and difficult to pronounce, and I think that UA sold the name to Air Canada.

Now, the term "concierge" is in wide use in the USA.

United - in many ways - used to be ahead of its time. Now....UA seems to try (poorly in my opinion) to follow DL - even if it means a rush to the bottom.