UA 4601 then AA 529 at O'Hare
St Louis → Chicago → Knoxville
Timetable, Chicago time
11:16UA 4601 from St Louis at the gate
10:36AA 529 to Knoxville leaves the gate
23 h 20 apart on the timetable, overnight
AA 529 leaves 23 h 20 after UA 4601 arrives on the timetable: more than half a day, so not a connection we count.