AA 4751 then FX 9791 at O'Hare
Knoxville → Chicago → Anchorage
Timetable, Chicago time
08:39AA 4751 from Knoxville at the gate
04:00FX 9791 to Anchorage leaves the gate
19 h 21 apart on the timetable, overnight
FX 9791 leaves 19 h 21 after AA 4751 arrives on the timetable: more than half a day, so not a connection we count.