UA 6104 then AA 5580 at O'Hare
South Bend → Chicago → Knoxville
Timetable, Chicago time
19:00UA 6104 from South Bend at the gate
08:06AA 5580 to Knoxville leaves the gate
13 h 06 apart on the timetable, overnight
AA 5580 leaves 13 h 06 after UA 6104 arrives on the timetable: more than half a day, so not a connection we count.