DL 2391 then DL 1328 at Atlanta
Boston → Atlanta → Miami
Timetable, Atlanta time
16:35DL 2391 from Boston at the gate
16:33DL 1328 to Miami leaves the gate
23 h 58 apart on the timetable, overnight
DL 1328 leaves 23 h 58 after DL 2391 arrives on the timetable: more than half a day, so not a connection we count.