AA 1200 then FX 9791 at O'Hare
Washington National → Chicago → Anchorage
Timetable, Chicago time
11:34AA 1200 from Washington National at the gate
04:00FX 9791 to Anchorage leaves the gate
16 h 26 apart on the timetable, overnight
FX 9791 leaves 16 h 26 after AA 1200 arrives on the timetable: more than half a day, so not a connection we count.