AA 3704 then UA 3636 at O'Hare
La Crosse → Chicago → Knoxville
Timetable, Chicago time
07:30AA 3704 from La Crosse at the gate
07:07UA 3636 to Knoxville leaves the gate
23 h 37 apart on the timetable, overnight
UA 3636 leaves 23 h 37 after AA 3704 arrives on the timetable: more than half a day, so not a connection we count.