UA 202 then DL 2020 at Atlanta
Chicago O'Hare → Atlanta → Oklahoma City
Timetable, Atlanta time
12:14UA 202 from Chicago O'Hare at the gate
11:20DL 2020 to Oklahoma City leaves the gate
23 h 06 apart on the timetable, overnight
DL 2020 leaves 23 h 06 after UA 202 arrives on the timetable: more than half a day, so not a connection we count.