AA 4735 then B6 833 at Boston
Syracuse → Boston → San Francisco
Timetable, Boston time
11:50AA 4735 from Syracuse at the gate
09:30B6 833 to San Francisco leaves the gate
21 h 40 apart on the timetable, overnight
B6 833 leaves 21 h 40 after AA 4735 arrives on the timetable: more than half a day, so not a connection we count.