UA 3532 then AA 5519 at O'Hare
Knoxville → Chicago → Louisville
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
15:00AA 5519 to Louisville leaves the gate
20 h 17 apart on the timetable, overnight
AA 5519 leaves 20 h 17 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.