UA 6047 then UA 545 at O'Hare
Pittsburgh → Chicago → Philadelphia
Timetable, Chicago time
20:31UA 6047 from Pittsburgh at the gate
19:45UA 545 to Philadelphia leaves the gate
23 h 14 apart on the timetable, overnight
UA 545 leaves 23 h 14 after UA 6047 arrives on the timetable: more than half a day, so not a connection we count.