AA 4504 then AA 2305 at O'Hare
South Bend → Chicago → Washington National
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
12:59AA 2305 to Washington National leaves the gate
18 h 24 apart on the timetable, overnight
AA 2305 leaves 18 h 24 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.