UA 4581 then AA 529 at O'Hare
Knoxville → Chicago → Knoxville
Timetable, Chicago time
11:39UA 4581 from Knoxville at the gate
10:36AA 529 to Knoxville leaves the gate
22 h 57 apart on the timetable, overnight
AA 529 leaves 22 h 57 after UA 4581 arrives on the timetable: more than half a day, so not a connection we count.