UA 5210 then AA 4400 at O'Hare
Saginaw → Chicago → Memphis
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
11:50AA 4400 to Memphis leaves the gate
21 h 35 apart on the timetable, overnight
AA 4400 leaves 21 h 35 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.