UA 356 then DL 1892 at Atlanta
Chicago O'Hare → Atlanta → Chattanooga
Timetable, Atlanta time
17:38UA 356 from Chicago O'Hare at the gate
14:30DL 1892 to Chattanooga leaves the gate
20 h 52 apart on the timetable, overnight
DL 1892 leaves 20 h 52 after UA 356 arrives on the timetable: more than half a day, so not a connection we count.