AA 1204 then UA 3707 at O'Hare
Miami → Chicago → Indianapolis
Timetable, Chicago time
07:42AA 1204 from Miami at the gate
19:55UA 3707 to Indianapolis leaves the gate
12 h 13 apart on the timetable
UA 3707 leaves 12 h 13 after AA 1204 arrives on the timetable: more than half a day, so not a connection we count.