OZ 6344 then DL 977 at San Francisco
St Louis → San Francisco → Boston
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
12:55DL 977 to Boston leaves the gatealso KE 6731
15 h 14 apart on the timetable, overnight
DL 977 leaves 15 h 14 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.