DL 188 then DL 1892 at Atlanta
Seoul → Atlanta → Chattanooga
Timetable, Atlanta time
17:10DL 188 from Seoul at the gate
14:30DL 1892 to Chattanooga leaves the gate
21 h 20 apart on the timetable, overnight
DL 1892 leaves 21 h 20 after DL 188 arrives on the timetable: more than half a day, so not a connection we count.