AA 3815 then DL 1840 at O'Hare
Hartford → Chicago → Salt Lake City
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
19:15DL 1840 to Salt Lake City leaves the gate
23 h apart on the timetable, overnight
DL 1840 leaves 23 h after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.