UA 5210 then AA 531 at O'Hare
Saginaw → Chicago → Dallas-Fort Worth
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:44AA 531 to Dallas-Fort Worth leaves the gate
23 h 29 apart on the timetable, overnight
AA 531 leaves 23 h 29 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.