DL 514 then AA 3148 at Phoenix
Boston → Phoenix → Miami
Timetable, Phoenix time
21:53DL 514 from Boston at the gate
16:39AA 3148 to Miami leaves the gate
18 h 46 apart on the timetable, overnight
AA 3148 leaves 18 h 46 after DL 514 arrives on the timetable: more than half a day, so not a connection we count.