DL 1248 then DL 2168 at Atlanta
Harrisburg → Atlanta → Key West
Timetable, Atlanta time
16:08DL 1248 from Harrisburg at the gate
15:20DL 2168 to Key West leaves the gate
23 h 12 apart on the timetable, overnight
DL 2168 leaves 23 h 12 after DL 1248 arrives on the timetable: more than half a day, so not a connection we count.