DL 9975 then DL 514 at Boston
Miami (MIA) → Boston → Phoenix
Timetable, Boston time
02:50DL 9975 from Miami (MIA) at the gate
18:10DL 514 to Phoenix leaves the gate
15 h 20 apart on the timetable
DL 514 leaves 15 h 20 after DL 9975 arrives on the timetable: more than half a day, so not a connection we count.