CV 21 then AA 1457 at O'Hare
Anchorage → Chicago → Boston
Timetable, Chicago time
22:27CV 21 from Anchorage at the gate
20:00AA 1457 to Boston leaves the gate
21 h 33 apart on the timetable, overnight
AA 1457 leaves 21 h 33 after CV 21 arrives on the timetable: more than half a day, so not a connection we count.