AA 2056 then UA 3876 at O'Hare
Cedar Rapids → Chicago → Miami
Timetable, Chicago time
06:23AA 2056 from Cedar Rapids at the gate
21:00UA 3876 to Miami leaves the gate
14 h 37 apart on the timetable
UA 3876 leaves 14 h 37 after AA 2056 arrives on the timetable: more than half a day, so not a connection we count.