UA 3501 then AA 4748 at O'Hare
Kansas City → Chicago → Pittsburgh
Timetable, Chicago time
17:05UA 3501 from Kansas City at the gate
09:45AA 4748 to Pittsburgh leaves the gate
16 h 40 apart on the timetable, overnight
AA 4748 leaves 16 h 40 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.