Spare me the innacurate statements. You are the one that said your B757 could make JFK-ACC when the 757s are starting out of JFK. Some 5000 miles, and you fly them (supposely). I liked the one about the Cuzco too. You sounded liked a high school kid.
As far as JAL and NCA, they do stop in ANC, but the main thing is and the latest trend is that their equipment (B744Fs) do make Japan-west coast non-stop, and ORD too, which NW could not offer with their B742s, I see that as a disadvantage. Many JAL and NCA flights that stops in ANC actually go to Europe, where NW does not compete. That is not topic at hand though, neither this fantasy SEA stuff. Don't get all upset and offend me with cheap shots just because I won't agree with your fantansy and said it was naive.
United will never leave SFO, although if United ever comes to an end, someone else will re-establish SFO and acquire their assets, that is guaranteed to happen, it's currently a true pacific gateway.
B767s are much slower airplanes too, compared to B744/B777. Joy.
Back to the DC9 topic. Ciao.