AA 3492 then BR 643 at O'Hare
Champaign → Chicago → Anchorage
Timetable, Chicago time
13:56AA 3492 from Champaign at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 59 apart on the timetable, overnight
BR 643 leaves 21 h 59 after AA 3492 arrives on the timetable: more than half a day, so not a connection we count.