UA 3501 then AA 3811 at O'Hare
Kansas City → Chicago → Omaha
Timetable, Chicago time
17:05UA 3501 from Kansas City at the gate
13:47AA 3811 to Omaha leaves the gate
20 h 42 apart on the timetable, overnight
AA 3811 leaves 20 h 42 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.