UA 1341 then UA 1496 at San Francisco
Detroit → San Francisco → Boston
Timetable, San Francisco time
19:31UA 1341 from Detroit at the gatealso OZ 9538
14:42UA 1496 to Boston leaves the gatealso VA 8307, NZ 9013
19 h 11 apart on the timetable, overnight
UA 1496 leaves 19 h 11 after UA 1341 arrives on the timetable: more than half a day, so not a connection we count.