AA 3815 then AA 4504 at O'Hare
Hartford → Chicago → Philadelphia
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
19:59AA 4504 to Philadelphia leaves the gate
23 h 44 apart on the timetable, overnight
AA 4504 leaves 23 h 44 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.