DL 5121 then DL 1892 at Atlanta
White Plains → Atlanta → Chattanooga
Timetable, Atlanta time
18:50DL 5121 from White Plains at the gate
14:30DL 1892 to Chattanooga leaves the gate
19 h 40 apart on the timetable, overnight
DL 1892 leaves 19 h 40 after DL 5121 arrives on the timetable: more than half a day, so not a connection we count.