LA 6139 then AM 3851 at San Francisco
Boston → San Francisco → Atlanta
Timetable, San Francisco time
00:24LA 6139 from Boston at the gate
23:59AM 3851 to Atlanta leaves the gate
23 h 35 apart on the timetable
AM 3851 leaves 23 h 35 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.