AA 706 then LF 7920 at O'Hare
Washington National → Chicago → BKX
Timetable, Chicago time
16:18AA 706 from Washington National at the gate
13:45LF 7920 to BKX leaves the gate
21 h 27 apart on the timetable, overnight
LF 7920 leaves 21 h 27 after AA 706 arrives on the timetable: more than half a day, so not a connection we count.