AA 3815 then AA 6346 at O'Hare
Hartford → Chicago → Lexington
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
15:45AA 6346 to Lexington leaves the gate
19 h 30 apart on the timetable, overnight
AA 6346 leaves 19 h 30 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.