UA 3915 then AA 2200 at O'Hare
Miami → Chicago → Miami
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
19:50AA 2200 to Miami leaves the gate
21 h 25 apart on the timetable, overnight
AA 2200 leaves 21 h 25 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.