AA 2273 then UA 6080 at O'Hare
San Diego → Chicago → Saginaw
Timetable, Chicago time
14:00AA 2273 from San Diego at the gate
13:25UA 6080 to Saginaw leaves the gate
23 h 25 apart on the timetable, overnight
UA 6080 leaves 23 h 25 after AA 2273 arrives on the timetable: more than half a day, so not a connection we count.