Before UA started service to Asia through SEA, UA had used the name "Royal Hawaiian Service" for their Mainland to Hawaii flights. At the time, Hawaii flights were the longest, most deluxe service in the UA system. To see the menus, google "United Airlines Royal Hawaiian Service".
Once UA started service on SEA-HKG/NRT, all TransPac service changed to "Royal Pacific Service" -- even on the Hawaii flights. At the time (mid-80's), the F service on Mainland-Hawaii flights was excellent (even a level higher than the Transcon service).