UA 5210 then AA 3683 at O'Hare
Saginaw → Chicago → Bangor
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:36AA 3683 to Bangor leaves the gate
23 h 21 apart on the timetable, overnight
AA 3683 leaves 23 h 21 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.