CV 12 then UA 3487 at O'Hare
Anchorage → Chicago → Key West
Timetable, Chicago time
19:11CV 12 from Anchorage at the gate
10:58UA 3487 to Key West leaves the gate
15 h 47 apart on the timetable, overnight
UA 3487 leaves 15 h 47 after CV 12 arrives on the timetable: more than half a day, so not a connection we count.