AA 3239 then G7 3376 at O'Hare
Pittsburgh → Chicago → St Louis
Timetable, Chicago time
16:54AA 3239 from Pittsburgh at the gate
11:00G7 3376 to St Louis leaves the gate
18 h 06 apart on the timetable, overnight
G7 3376 leaves 18 h 06 after AA 3239 arrives on the timetable: more than half a day, so not a connection we count.