F9 1549 then DL 3020 at Atlanta
Jacksonville → Atlanta → Memphis
Timetable, Atlanta time
21:38F9 1549 from Jacksonville at the gate
19:59DL 3020 to Memphis leaves the gate
22 h 21 apart on the timetable, overnight
DL 3020 leaves 22 h 21 after F9 1549 arrives on the timetable: more than half a day, so not a connection we count.