F9 3453 then DL 3020 at Atlanta
New York LaGuardia → Atlanta → Memphis
Timetable, Atlanta time
20:27F9 3453 from New York LaGuardia at the gate
19:59DL 3020 to Memphis leaves the gate
23 h 32 apart on the timetable, overnight
DL 3020 leaves 23 h 32 after F9 3453 arrives on the timetable: more than half a day, so not a connection we count.