BR 646 then UA 2220 at O'Hare
Anchorage → Chicago → Boston
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
12:11UA 2220 to Boston leaves the gate
19 h 01 apart on the timetable, overnight
UA 2220 leaves 19 h 01 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.