LA 6139 then DL 8929 at San Francisco
Boston → San Francisco → Los Angeles
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
23:00DL 8929 to Los Angeles leaves the gate
23 h 02 apart on the timetable, overnight
DL 8929 leaves 23 h 02 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.