DL 1625 then AA 4557 at Atlanta
Memphis → Atlanta → New York LaGuardia
Timetable, Atlanta time
10:30DL 1625 from Memphis at the gate
09:39AA 4557 to New York LaGuardia leaves the gate
23 h 09 apart on the timetable, overnight
AA 4557 leaves 23 h 09 after DL 1625 arrives on the timetable: more than half a day, so not a connection we count.