UA 3915 then AA 3233 at O'Hare
Miami → Chicago → Phoenix
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
19:00AA 3233 to Phoenix leaves the gate
20 h 35 apart on the timetable, overnight
AA 3233 leaves 20 h 35 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.