AA 1598 then BR 643 at O'Hare
Los Angeles → Chicago → Anchorage
Timetable, Chicago time
13:52AA 1598 from Los Angeles at the gate
11:25BR 643 to Anchorage leaves the gate
21 h 33 apart on the timetable, overnight
BR 643 leaves 21 h 33 after AA 1598 arrives on the timetable: more than half a day, so not a connection we count.