DL 1187 then AA 2764 at Boston
Detroit → Boston → Miami
Timetable, Boston time
23:59DL 1187 from Detroit at the gate
12:00AA 2764 to Miami leaves the gate
12 h 01 apart on the timetable, overnight
AA 2764 leaves 12 h 01 after DL 1187 arrives on the timetable: more than half a day, so not a connection we count.