AA 3308 then B6 833 at Boston
Philadelphia → Boston → San Francisco
Timetable, Boston time
09:39AA 3308 from Philadelphia at the gate
09:30B6 833 to San Francisco leaves the gate
23 h 51 apart on the timetable, overnight
B6 833 leaves 23 h 51 after AA 3308 arrives on the timetable: more than half a day, so not a connection we count.