AA 1997 then FX 9791 at O'Hare
St Louis → Chicago → Anchorage
Timetable, Chicago time
09:00AA 1997 from St Louis at the gate
04:00FX 9791 to Anchorage leaves the gate
19 h apart on the timetable, overnight
FX 9791 leaves 19 h after AA 1997 arrives on the timetable: more than half a day, so not a connection we count.