AA 3815 then BR 643 at O'Hare
Columbus (Ohio) → Chicago → Anchorage
Timetable, Chicago time
14:43AA 3815 from Columbus (Ohio) at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 12 apart on the timetable, overnight
BR 643 leaves 21 h 12 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.