AA 3133 then UA 3876 at O'Hare
Minneapolis → Chicago → Miami
Timetable, Chicago time
18:03AA 3133 from Minneapolis at the gate
07:00UA 3876 to Miami leaves the gate
12 h 57 apart on the timetable, overnight
UA 3876 leaves 12 h 57 after AA 3133 arrives on the timetable: more than half a day, so not a connection we count.