AA 9928 then AA 1159 at O'Hare
New York LaGuardia → Chicago → Miami
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
18:59AA 1159 to Miami leaves the gate
12 h 14 apart on the timetable
AA 1159 leaves 12 h 14 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.