CZ 435 then UA 2015 at O'Hare
Anchorage → Chicago → Cozumel
Timetable, Chicago time
17:05CZ 435 from Anchorage at the gate
09:19UA 2015 to Cozumel leaves the gate
16 h 14 apart on the timetable, overnight
UA 2015 leaves 16 h 14 after CZ 435 arrives on the timetable: more than half a day, so not a connection we count.