UA 5210 then AA 4920 at O'Hare
Saginaw → Chicago → Milwaukee
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:20AA 4920 to Milwaukee leaves the gate
23 h 05 apart on the timetable, overnight
AA 4920 leaves 23 h 05 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.