VS 1903 then UA 1665 at San Francisco
Seattle → San Francisco → Boston
Timetable, San Francisco time
23:33VS 1903 from Seattle at the gatealso AF 2198, DL 2635, AM 4471
23:20UA 1665 to Boston leaves the gatealso VA 8306, NZ 9018
23 h 47 apart on the timetable, overnight
UA 1665 leaves 23 h 47 after VS 1903 arrives on the timetable: more than half a day, so not a connection we count.