UA 2483 then DL 2709 at Houston
Chicago → Houston → Atlanta
Timetable, Houston time
10:32UA 2483 from Chicago at the gate
08:05DL 2709 to Atlanta leaves the gate
21 h 33 apart on the timetable, overnight
DL 2709 leaves 21 h 33 after UA 2483 arrives on the timetable: more than half a day, so not a connection we count.