UA 2449 then AA 529 at O'Hare
Phoenix → Chicago → Knoxville
Timetable, Chicago time
12:39UA 2449 from Phoenix at the gate
10:36AA 529 to Knoxville leaves the gate
21 h 57 apart on the timetable, overnight
AA 529 leaves 21 h 57 after UA 2449 arrives on the timetable: more than half a day, so not a connection we count.