UA 4592 then UA 1839 at O'Hare
Omaha → Chicago → Des Moines
Timetable, Chicago time
20:36UA 4592 from Omaha at the gate
20:25UA 1839 to Des Moines leaves the gate
23 h 49 apart on the timetable, overnight
UA 1839 leaves 23 h 49 after UA 4592 arrives on the timetable: more than half a day, so not a connection we count.