DL 977 then B6 278 at San Francisco
Boston → San Francisco → Fort Lauderdale
Timetable, San Francisco time
11:20DL 977 from Boston at the gate
23:25B6 278 to Fort Lauderdale leaves the gatealso AD 7694
12 h 05 apart on the timetable
B6 278 leaves 12 h 05 after DL 977 arrives on the timetable: more than half a day, so not a connection we count.