DL 706 then AA 2398 at Atlanta
Denver → Atlanta → Dallas-Fort Worth
Timetable, Atlanta time
21:24DL 706 from Denver at the gate
17:30AA 2398 to Dallas-Fort Worth leaves the gate
20 h 06 apart on the timetable, overnight
AA 2398 leaves 20 h 06 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.