AA 3815 then UA 745 at O'Hare
Hartford → Chicago → Boston
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
15:44UA 745 to Boston leaves the gate
19 h 29 apart on the timetable, overnight
UA 745 leaves 19 h 29 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.