UA 5210 then AA 2645 at O'Hare
Saginaw → Chicago → Houston
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
10:35AA 2645 to Houston leaves the gate
20 h 20 apart on the timetable, overnight
AA 2645 leaves 20 h 20 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.