AA 3815 then AA 1848 at O'Hare
Hartford → Chicago → Philadelphia
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
16:50AA 1848 to Philadelphia leaves the gate
20 h 35 apart on the timetable, overnight
AA 1848 leaves 20 h 35 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.