UA 5210 then AA 2074 at O'Hare
Saginaw → Chicago → Boston
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:37AA 2074 to Boston leaves the gate
23 h 22 apart on the timetable, overnight
AA 2074 leaves 23 h 22 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.