AA 3815 then UA 312 at O'Hare
Hartford → Chicago → Austin
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
19:55UA 312 to Austin leaves the gate
23 h 40 apart on the timetable, overnight
UA 312 leaves 23 h 40 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.