AA 2590 then UA 6080 at O'Hare
Santa Ana → Chicago → Saginaw
Timetable, Chicago time
15:03AA 2590 from Santa Ana at the gate
13:25UA 6080 to Saginaw leaves the gate
22 h 22 apart on the timetable, overnight
UA 6080 leaves 22 h 22 after AA 2590 arrives on the timetable: more than half a day, so not a connection we count.