AA 969 then UA 3876 at O'Hare
Pittsburgh → Chicago → Miami
Timetable, Chicago time
16:54AA 969 from Pittsburgh at the gate
07:00UA 3876 to Miami leaves the gate
14 h 06 apart on the timetable, overnight
UA 3876 leaves 14 h 06 after AA 969 arrives on the timetable: more than half a day, so not a connection we count.