CZ 427 then AA 3768 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
05:24CZ 427 from Anchorage at the gate
20:50AA 3768 to St Louis leaves the gate
15 h 26 apart on the timetable
AA 3768 leaves 15 h 26 after CZ 427 arrives on the timetable: more than half a day, so not a connection we count.