UA 3532 then AA 4042 at O'Hare
Knoxville → Chicago → Omaha
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:51AA 4042 to Omaha leaves the gate
19 h 08 apart on the timetable, overnight
AA 4042 leaves 19 h 08 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.