UA 5210 then AA 2604 at O'Hare
Saginaw → Chicago → Austin
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:28AA 2604 to Austin leaves the gate
23 h 13 apart on the timetable, overnight
AA 2604 leaves 23 h 13 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.