DL 2168 then DL 1892 at Atlanta
Key West → Atlanta → Chattanooga
Timetable, Atlanta time
20:19DL 2168 from Key West at the gate
14:30DL 1892 to Chattanooga leaves the gate
18 h 11 apart on the timetable, overnight
DL 1892 leaves 18 h 11 after DL 2168 arrives on the timetable: more than half a day, so not a connection we count.