DL 5653 then DL 1655 at Boston
Columbus (Ohio) → Boston → San Francisco
Timetable, Boston time
19:42DL 5653 from Columbus (Ohio) at the gate
16:50DL 1655 to San Francisco leaves the gate
21 h 08 apart on the timetable, overnight
DL 1655 leaves 21 h 08 after DL 5653 arrives on the timetable: more than half a day, so not a connection we count.