UA 5210 then AA 1640 at O'Hare
Saginaw → Chicago → Phoenix
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:26AA 1640 to Phoenix leaves the gate
23 h 11 apart on the timetable, overnight
AA 1640 leaves 23 h 11 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.