AA 3815 then AA 407 at O'Hare
Hartford → Chicago → Boston
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
17:11AA 407 to Boston leaves the gate
20 h 56 apart on the timetable, overnight
AA 407 leaves 20 h 56 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.