AA 9928 then AA 3851 at O'Hare
New York LaGuardia → Chicago → Chattanooga
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
21:00AA 3851 to Chattanooga leaves the gate
14 h 15 apart on the timetable
AA 3851 leaves 14 h 15 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.