DL 3977 then DL 1627 at Detroit
Lexington → Detroit → Memphis
Timetable, Detroit time
09:05DL 3977 from Lexington at the gate
08:27DL 1627 to Memphis leaves the gate
23 h 22 apart on the timetable, overnight
DL 1627 leaves 23 h 22 after DL 3977 arrives on the timetable: more than half a day, so not a connection we count.