UA 5210 then AA 4757 at O'Hare
Saginaw → Chicago → Pittsburgh
Timetable, Chicago time
10:10UA 5210 from Saginaw at the gate
09:46AA 4757 to Pittsburgh leaves the gate
23 h 36 apart on the timetable, overnight
AA 4757 leaves 23 h 36 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.