DL 2391 then DL 1892 at Atlanta
Boston → Atlanta → Chattanooga
Timetable, Atlanta time
16:35DL 2391 from Boston at the gate
14:30DL 1892 to Chattanooga leaves the gate
21 h 55 apart on the timetable, overnight
DL 1892 leaves 21 h 55 after DL 2391 arrives on the timetable: more than half a day, so not a connection we count.