UA 3532 then AA 3610 at O'Hare
Knoxville → Chicago → Toronto Pearson
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
14:50AA 3610 to Toronto Pearson leaves the gate
20 h 07 apart on the timetable, overnight
AA 3610 leaves 20 h 07 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.