AA 9928 then AA 1187 at O'Hare
New York LaGuardia → Chicago → Washington National
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
18:55AA 1187 to Washington National leaves the gate
12 h 10 apart on the timetable
AA 1187 leaves 12 h 10 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.