UA 4394 then AA 529 at O'Hare
Huntsville → Chicago → Knoxville
Timetable, Chicago time
14:39UA 4394 from Huntsville at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 57 apart on the timetable, overnight
AA 529 leaves 19 h 57 after UA 4394 arrives on the timetable: more than half a day, so not a connection we count.