AA 4102 then UA 6080 at O'Hare
Denver → Chicago → Saginaw
Timetable, Chicago time
12:55AA 4102 from Denver at the gate
12:40UA 6080 to Saginaw leaves the gate
23 h 45 apart on the timetable, overnight
UA 6080 leaves 23 h 45 after AA 4102 arrives on the timetable: more than half a day, so not a connection we count.