AA 3815 then UA 3598 at O'Hare
Hartford → Chicago → Louisville
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
18:10UA 3598 to Louisville leaves the gate
21 h 55 apart on the timetable, overnight
UA 3598 leaves 21 h 55 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.