AA 2762 then LF 7920 at O'Hare
Denver → Chicago → BKX
Timetable, Chicago time
16:00AA 2762 from Denver at the gate
13:45LF 7920 to BKX leaves the gate
21 h 45 apart on the timetable, overnight
LF 7920 leaves 21 h 45 after AA 2762 arrives on the timetable: more than half a day, so not a connection we count.