UA 1492 then AA 529 at O'Hare
Las Vegas → Chicago → Knoxville
Timetable, Chicago time
14:29UA 1492 from Las Vegas at the gate
10:36AA 529 to Knoxville leaves the gate
20 h 07 apart on the timetable, overnight
AA 529 leaves 20 h 07 after UA 1492 arrives on the timetable: more than half a day, so not a connection we count.