OO 9921 then OO 6080 at O'Hare
Phoenix → Chicago → Saginaw
Timetable, Chicago time
15:57OO 9921 from Phoenix at the gate
13:25OO 6080 to Saginaw leaves the gate
21 h 28 apart on the timetable, overnight
OO 6080 leaves 21 h 28 after OO 9921 arrives on the timetable: more than half a day, so not a connection we count.