UA 2180 then LF 7920 at O'Hare
Pittsburgh → Chicago → BKX
Timetable, Chicago time
14:55UA 2180 from Pittsburgh at the gate
13:45LF 7920 to BKX leaves the gate
22 h 50 apart on the timetable, overnight
LF 7920 leaves 22 h 50 after UA 2180 arrives on the timetable: more than half a day, so not a connection we count.