AA 547 then G7 3376 at O'Hare
Boston → Chicago → St Louis
Timetable, Chicago time
15:29AA 547 from Boston at the gate
11:00G7 3376 to St Louis leaves the gate
19 h 31 apart on the timetable, overnight
G7 3376 leaves 19 h 31 after AA 547 arrives on the timetable: more than half a day, so not a connection we count.