DL 9979 then AA 4460 at Atlanta
Detroit → Atlanta → New York LaGuardia
Timetable, Atlanta time
15:41DL 9979 from Detroit at the gate
14:49AA 4460 to New York LaGuardia leaves the gate
23 h 08 apart on the timetable, overnight
AA 4460 leaves 23 h 08 after DL 9979 arrives on the timetable: more than half a day, so not a connection we count.