UA 5210 then AA 789 at O'Hare
Saginaw → Chicago → Washington National
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:18AA 789 to Washington National leaves the gate
23 h 03 apart on the timetable, overnight
AA 789 leaves 23 h 03 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.