UA 1577 then AA 529 at O'Hare
Atlanta → Chicago → Knoxville
Timetable, Chicago time
10:47UA 1577 from Atlanta at the gate
10:36AA 529 to Knoxville leaves the gate
23 h 49 apart on the timetable, overnight
AA 529 leaves 23 h 49 after UA 1577 arrives on the timetable: more than half a day, so not a connection we count.