UA 3532 then AA 6256 at O'Hare
Knoxville → Chicago → Sioux Falls
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
16:47AA 6256 to Sioux Falls leaves the gate
22 h 04 apart on the timetable, overnight
AA 6256 leaves 22 h 04 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.