UA 5304 then AA 529 at O'Hare
Des Moines → Chicago → Knoxville
Timetable, Chicago time
12:58UA 5304 from Des Moines at the gate
10:36AA 529 to Knoxville leaves the gate
21 h 38 apart on the timetable, overnight
AA 529 leaves 21 h 38 after UA 5304 arrives on the timetable: more than half a day, so not a connection we count.