AA 2273 then BR 643 at O'Hare
San Diego → Chicago → Anchorage
Timetable, Chicago time
14:00AA 2273 from San Diego at the gate
11:55BR 643 to Anchorage leaves the gate
21 h 55 apart on the timetable, overnight
BR 643 leaves 21 h 55 after AA 2273 arrives on the timetable: more than half a day, so not a connection we count.