UA 2754 then B6 1234 at San Francisco
Minneapolis → San Francisco → Boston
Timetable, San Francisco time
19:33UA 2754 from Minneapolis at the gatealso OZ 6312, VA 8253, NZ 9438
14:50B6 1234 to Boston leaves the gate
19 h 17 apart on the timetable, overnight
B6 1234 leaves 19 h 17 after UA 2754 arrives on the timetable: more than half a day, so not a connection we count.