UA 2430 then AA 5483 at Philadelphia
Chicago O'Hare → Philadelphia → Pittsburgh
Timetable, Philadelphia time
17:47UA 2430 from Chicago O'Hare at the gate
14:30AA 5483 to Pittsburgh leaves the gate
20 h 43 apart on the timetable, overnight
AA 5483 leaves 20 h 43 after UA 2430 arrives on the timetable: more than half a day, so not a connection we count.