UA 6040 then AA 529 at O'Hare
Des Moines → Chicago → Knoxville
Timetable, Chicago time
14:44UA 6040 from Des Moines at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 52 apart on the timetable, overnight
AA 529 leaves 19 h 52 after UA 6040 arrives on the timetable: more than half a day, so not a connection we count.