AA 2432 then UA 3876 at O'Hare
Indianapolis → Chicago → Miami
Timetable, Chicago time
06:00AA 2432 from Indianapolis at the gate
21:00UA 3876 to Miami leaves the gate
15 h apart on the timetable
UA 3876 leaves 15 h after AA 2432 arrives on the timetable: more than half a day, so not a connection we count.