DL 1223 then AA 5456 at Atlanta
Cincinnati Northern Kentucky → Atlanta → Philadelphia
Timetable, Atlanta time
16:33DL 1223 from Cincinnati Northern Kentucky at the gate
13:31AA 5456 to Philadelphia leaves the gate
20 h 58 apart on the timetable, overnight
AA 5456 leaves 20 h 58 after DL 1223 arrives on the timetable: more than half a day, so not a connection we count.