AA 3852 then G7 3376 at O'Hare
Chattanooga → Chicago → St Louis
Timetable, Chicago time
11:04AA 3852 from Chattanooga at the gate
11:00G7 3376 to St Louis leaves the gate
23 h 56 apart on the timetable, overnight
G7 3376 leaves 23 h 56 after AA 3852 arrives on the timetable: more than half a day, so not a connection we count.