UA 6104 then AA 6283 at O'Hare
South Bend → Chicago → Des Moines
Timetable, Chicago time
19:00UA 6104 from South Bend at the gate
11:54AA 6283 to Des Moines leaves the gate
16 h 54 apart on the timetable, overnight
AA 6283 leaves 16 h 54 after UA 6104 arrives on the timetable: more than half a day, so not a connection we count.