AA 4622 then UA 3636 at O'Hare
Louisville → Chicago → Knoxville
Timetable, Chicago time
07:15AA 4622 from Louisville at the gate
07:07UA 3636 to Knoxville leaves the gate
23 h 52 apart on the timetable, overnight
UA 3636 leaves 23 h 52 after AA 4622 arrives on the timetable: more than half a day, so not a connection we count.