AA 2436 then BR 643 at O'Hare
San Francisco → Chicago → Anchorage
Timetable, Chicago time
15:15AA 2436 from San Francisco at the gate
11:55BR 643 to Anchorage leaves the gate
20 h 40 apart on the timetable, overnight
BR 643 leaves 20 h 40 after AA 2436 arrives on the timetable: more than half a day, so not a connection we count.