DL 1223 then DL 724 at Atlanta
Cincinnati → Atlanta → Knoxville
Timetable, Atlanta time
16:33DL 1223 from Cincinnati at the gate
12:59DL 724 to Knoxville leaves the gate
20 h 26 apart on the timetable, overnight
DL 724 leaves 20 h 26 after DL 1223 arrives on the timetable: more than half a day, so not a connection we count.