UA 202 then DL 1507 at Atlanta
Chicago O'Hare → Atlanta → Tri-Cities
Timetable, Atlanta time
12:14UA 202 from Chicago O'Hare at the gate
12:06DL 1507 to Tri-Cities leaves the gate
23 h 52 apart on the timetable, overnight
DL 1507 leaves 23 h 52 after UA 202 arrives on the timetable: more than half a day, so not a connection we count.