CV 209 then AA 4780 at O'Hare
Anchorage → Chicago → Buffalo
Timetable, Chicago time
19:50CV 209 from Anchorage at the gate
08:00AA 4780 to Buffalo leaves the gate
12 h 10 apart on the timetable, overnight
AA 4780 leaves 12 h 10 after CV 209 arrives on the timetable: more than half a day, so not a connection we count.