AA 3857 then DL 514 at Boston
Syracuse → Boston → Phoenix
Timetable, Boston time
14:27AA 3857 from Syracuse at the gate
08:35DL 514 to Phoenix leaves the gate
18 h 08 apart on the timetable, overnight
DL 514 leaves 18 h 08 after AA 3857 arrives on the timetable: more than half a day, so not a connection we count.