DL 1668 then DL 4970 at Atlanta
Indianapolis → Atlanta → Allentown
Timetable, Atlanta time
22:00DL 1668 from Indianapolis at the gate
20:10DL 4970 to Allentown leaves the gate
22 h 10 apart on the timetable, overnight
DL 4970 leaves 22 h 10 after DL 1668 arrives on the timetable: more than half a day, so not a connection we count.