CV 251 then DL 2828 at O'Hare
Anchorage → Chicago → Boston
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
07:05DL 2828 to Boston leaves the gate
12 h 05 apart on the timetable, overnight
DL 2828 leaves 12 h 05 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.