AA 6345 then FX 9791 at O'Hare
Lexington → Chicago → Anchorage
Timetable, Chicago time
11:59AA 6345 from Lexington at the gate
04:00FX 9791 to Anchorage leaves the gate
16 h 01 apart on the timetable, overnight
FX 9791 leaves 16 h 01 after AA 6345 arrives on the timetable: more than half a day, so not a connection we count.