ET 3608 then AA 3768 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
07:16ET 3608 from Anchorage at the gate
20:50AA 3768 to St Louis leaves the gate
13 h 34 apart on the timetable
AA 3768 leaves 13 h 34 after ET 3608 arrives on the timetable: more than half a day, so not a connection we count.