AA 3815 then UA 2071 at O'Hare
Hartford → Chicago → Boston
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
20:07UA 2071 to Boston leaves the gate
23 h 52 apart on the timetable, overnight
UA 2071 leaves 23 h 52 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.