UA 503 then KD 211 at O'Hare
Boston → Chicago → Anchorage
Timetable, Chicago time
12:29UA 503 from Boston at the gate
12:00KD 211 to Anchorage leaves the gate
23 h 31 apart on the timetable, overnight
KD 211 leaves 23 h 31 after UA 503 arrives on the timetable: more than half a day, so not a connection we count.