DL 512 then DL 1892 at Atlanta
Dallas → Atlanta → Chattanooga
Timetable, Atlanta time
18:59DL 512 from Dallas at the gate
14:30DL 1892 to Chattanooga leaves the gate
19 h 31 apart on the timetable, overnight
DL 1892 leaves 19 h 31 after DL 512 arrives on the timetable: more than half a day, so not a connection we count.