AA 3664 then BR 643 at O'Hare
Buffalo → Chicago → Anchorage
Timetable, Chicago time
12:29AA 3664 from Buffalo at the gate
11:55BR 643 to Anchorage leaves the gate
23 h 26 apart on the timetable, overnight
BR 643 leaves 23 h 26 after AA 3664 arrives on the timetable: more than half a day, so not a connection we count.