AA 3664 then FX 9791 at O'Hare
Buffalo → Chicago → Anchorage
Timetable, Chicago time
12:29AA 3664 from Buffalo at the gate
04:00FX 9791 to Anchorage leaves the gate
15 h 31 apart on the timetable, overnight
FX 9791 leaves 15 h 31 after AA 3664 arrives on the timetable: more than half a day, so not a connection we count.