UA 4484 then AA 529 at O'Hare
Sioux Falls → Chicago → Knoxville
Timetable, Chicago time
13:09UA 4484 from Sioux Falls at the gate
10:36AA 529 to Knoxville leaves the gate
21 h 27 apart on the timetable, overnight
AA 529 leaves 21 h 27 after UA 4484 arrives on the timetable: more than half a day, so not a connection we count.