UA 3915 then AA 4502 at O'Hare
Miami → Chicago → Pittsburgh
Timetable, Chicago time
22:25UA 3915 from Miami at the gate
21:02AA 4502 to Pittsburgh leaves the gate
22 h 37 apart on the timetable, overnight
AA 4502 leaves 22 h 37 after UA 3915 arrives on the timetable: more than half a day, so not a connection we count.