K4 579 then UA 5815 at O'Hare
Fairbanks → Chicago → Lexington
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
10:35UA 5815 to Lexington leaves the gate
18 h 12 apart on the timetable, overnight
UA 5815 leaves 18 h 12 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.