AA 6283 then UA 6080 at O'Hare
Des Moines → Chicago → Saginaw
Timetable, Chicago time
15:44AA 6283 from Des Moines at the gate
13:25UA 6080 to Saginaw leaves the gate
21 h 41 apart on the timetable, overnight
UA 6080 leaves 21 h 41 after AA 6283 arrives on the timetable: more than half a day, so not a connection we count.