K4 579 then UA 3487 at O'Hare
Fairbanks → Chicago → Key West
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
10:58UA 3487 to Key West leaves the gate
18 h 35 apart on the timetable, overnight
UA 3487 leaves 18 h 35 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.