DL 503 then DL 1472 at Atlanta
Detroit → Atlanta → Key West
Timetable, Atlanta time
11:27DL 503 from Detroit at the gate
11:07DL 1472 to Key West leaves the gate
23 h 40 apart on the timetable, overnight
DL 1472 leaves 23 h 40 after DL 503 arrives on the timetable: more than half a day, so not a connection we count.