UA 1580 then AA 529 at O'Hare
Nashville → Chicago → Knoxville
Timetable, Chicago time
11:40UA 1580 from Nashville at the gate
10:36AA 529 to Knoxville leaves the gate
22 h 56 apart on the timetable, overnight
AA 529 leaves 22 h 56 after UA 1580 arrives on the timetable: more than half a day, so not a connection we count.