K4 579 then UA 3907 at O'Hare
Fairbanks → Chicago → Washington
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
12:00UA 3907 to Washington leaves the gate
19 h 37 apart on the timetable, overnight
UA 3907 leaves 19 h 37 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.