AA 4998 then BR 643 at O'Hare
Albany (New York) → Chicago → Anchorage
Timetable, Chicago time
13:59AA 4998 from Albany (New York) at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 56 apart on the timetable, overnight
BR 643 leaves 21 h 56 after AA 4998 arrives on the timetable: more than half a day, so not a connection we count.