UA 2138 then OO 6080 at O'Hare
St Louis → Chicago → Saginaw
Timetable, Chicago time
14:35UA 2138 from St Louis at the gate
13:25OO 6080 to Saginaw leaves the gate
22 h 50 apart on the timetable, overnight
OO 6080 leaves 22 h 50 after UA 2138 arrives on the timetable: more than half a day, so not a connection we count.