UA 3532 then AA 6246 at O'Hare
Knoxville → Chicago → Nashville
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
15:05AA 6246 to Nashville leaves the gate
20 h 22 apart on the timetable, overnight
AA 6246 leaves 20 h 22 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.