OZ 6344 then DL 860 at San Francisco
St Louis → San Francisco → Boston
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
15:05DL 860 to Boston leaves the gate
17 h 24 apart on the timetable, overnight
DL 860 leaves 17 h 24 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.