AA 3815 then UA 3418 at O'Hare
Hartford → Chicago → Indianapolis
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
16:30UA 3418 to Indianapolis leaves the gate
20 h 15 apart on the timetable, overnight
UA 3418 leaves 20 h 15 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.