LA 6139 then B6 278 at San Francisco
Boston → San Francisco → Fort Lauderdale
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
23:25B6 278 to Fort Lauderdale leaves the gatealso AD 7694
23 h 27 apart on the timetable, overnight
B6 278 leaves 23 h 27 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.