K4 579 then UA 3683 at O'Hare
Fairbanks → Chicago → Buffalo
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
14:17UA 3683 to Buffalo leaves the gate
21 h 54 apart on the timetable, overnight
UA 3683 leaves 21 h 54 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.