AA 4229 then UA 4636 at O'Hare
Knoxville → Chicago → South Bend
Timetable, Chicago time
18:11AA 4229 from Knoxville at the gate
18:10UA 4636 to South Bend leaves the gate
23 h 59 apart on the timetable, overnight
UA 4636 leaves 23 h 59 after AA 4229 arrives on the timetable: more than half a day, so not a connection we count.