DL 8838 then DL 1655 at Boston
Montréal → Boston → San Francisco
Timetable, Boston time
17:08DL 8838 from Montréal at the gate
16:50DL 1655 to San Francisco leaves the gate
23 h 42 apart on the timetable, overnight
DL 1655 leaves 23 h 42 after DL 8838 arrives on the timetable: more than half a day, so not a connection we count.