AA 4757 then G7 3376 at O'Hare
Pittsburgh → Chicago → St Louis
Timetable, Chicago time
13:59AA 4757 from Pittsburgh at the gate
11:00G7 3376 to St Louis leaves the gate
21 h 01 apart on the timetable, overnight
G7 3376 leaves 21 h 01 after AA 4757 arrives on the timetable: more than half a day, so not a connection we count.