DL 9979 then DL 460 at Atlanta
Detroit → Atlanta → New York LaGuardia
Timetable, Atlanta time
15:41DL 9979 from Detroit at the gate
13:30DL 460 to New York LaGuardia leaves the gate
21 h 49 apart on the timetable, overnight
DL 460 leaves 21 h 49 after DL 9979 arrives on the timetable: more than half a day, so not a connection we count.