AA 1202 then UA 3907 at O'Hare
Miami → Chicago → Cleveland
Timetable, Chicago time
15:43AA 1202 from Miami at the gate
07:30UA 3907 to Cleveland leaves the gate
15 h 47 apart on the timetable, overnight
UA 3907 leaves 15 h 47 after AA 1202 arrives on the timetable: more than half a day, so not a connection we count.