UA 3532 then AA 4920 at O'Hare
Knoxville → Chicago → Milwaukee
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:20AA 4920 to Milwaukee leaves the gate
18 h 37 apart on the timetable, overnight
AA 4920 leaves 18 h 37 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.