AA 4757 then LF 7920 at O'Hare
Pittsburgh → Chicago → BKX
Timetable, Chicago time
14:03AA 4757 from Pittsburgh at the gate
13:45LF 7920 to BKX leaves the gate
23 h 42 apart on the timetable, overnight
LF 7920 leaves 23 h 42 after AA 4757 arrives on the timetable: more than half a day, so not a connection we count.