UA 743 then TP 4392 at San Francisco
Spokane → San Francisco → Boston
Timetable, San Francisco time
09:30UA 743 from Spokane at the gatealso LH 7937, NZ 9456
06:00TP 4392 to Boston leaves the gatealso EY 8006, EY 8261
20 h 30 apart on the timetable, overnight
TP 4392 leaves 20 h 30 after UA 743 arrives on the timetable: more than half a day, so not a connection we count.