UA 5205 then DL 2709 at Houston
Chicago → Houston → Atlanta
Timetable, Houston time
11:30UA 5205 from Chicago at the gate
08:05DL 2709 to Atlanta leaves the gate
20 h 35 apart on the timetable, overnight
DL 2709 leaves 20 h 35 after UA 5205 arrives on the timetable: more than half a day, so not a connection we count.