UA 6047 then AA 3574 at O'Hare
Pittsburgh → Chicago → Springfield Branson National
Timetable, Chicago time
20:31UA 6047 from Pittsburgh at the gate
17:29AA 3574 to Springfield Branson National leaves the gate
20 h 58 apart on the timetable, overnight
AA 3574 leaves 20 h 58 after UA 6047 arrives on the timetable: more than half a day, so not a connection we count.