DL 1223 then DL 3159 at Atlanta
Cincinnati → Atlanta → Nashville
Timetable, Atlanta time
16:30DL 1223 from Cincinnati at the gate
13:17DL 3159 to Nashville leaves the gate
20 h 47 apart on the timetable, overnight
DL 3159 leaves 20 h 47 after DL 1223 arrives on the timetable: more than half a day, so not a connection we count.