UA 4040 then DL 4644 at Atlanta
Houston → Atlanta → Moline
Timetable, Atlanta time
10:36UA 4040 from Houston at the gate
09:11DL 4644 to Moline leaves the gate
22 h 35 apart on the timetable, overnight
DL 4644 leaves 22 h 35 after UA 4040 arrives on the timetable: more than half a day, so not a connection we count.