DL 3122 then DL 8900 at Atlanta
Pittsburgh → Atlanta → Tupelo
Timetable, Atlanta time
22:00DL 3122 from Pittsburgh at the gate
21:00DL 8900 to Tupelo leaves the gate
23 h apart on the timetable, overnight
DL 8900 leaves 23 h after DL 3122 arrives on the timetable: more than half a day, so not a connection we count.