United used to fly from Seattle to Honolulu. The first 2 times we went it was a 747 (1981 and 1983). Then when we went again in 1985 and 1986 it was a DC-10. I always remembered the flights were always full and overbooked. So I assumed it was profitable but sometime between 1986 and when we went again in 1991 United had discontinued the flight. Anyone know when United discontinued the route and why?