UA 3532 then AA 3542 at O'Hare
Knoxville → Chicago → Columbus (Ohio)
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
15:28AA 3542 to Columbus (Ohio) leaves the gate
20 h 45 apart on the timetable, overnight
AA 3542 leaves 20 h 45 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.