B6 1234 then G4 3473 at Boston
San Francisco → Boston → Fort Lauderdale
Timetable, Boston time
23:58B6 1234 from San Francisco at the gate
12:34G4 3473 to Fort Lauderdale leaves the gate
12 h 36 apart on the timetable, overnight
G4 3473 leaves 12 h 36 after B6 1234 arrives on the timetable: more than half a day, so not a connection we count.