DL 3159 then DL 3122 at Atlanta
Nashville → Atlanta → Pittsburgh
Timetable, Atlanta time
16:14DL 3159 from Nashville at the gate
15:20DL 3122 to Pittsburgh leaves the gate
23 h 06 apart on the timetable, overnight
DL 3122 leaves 23 h 06 after DL 3159 arrives on the timetable: more than half a day, so not a connection we count.