CZ 435 then AA 1907 at O'Hare
Anchorage → Chicago → Cancún
Timetable, Chicago time
15:58CZ 435 from Anchorage at the gate
07:10AA 1907 to Cancún leaves the gate
15 h 12 apart on the timetable, overnight
AA 1907 leaves 15 h 12 after CZ 435 arrives on the timetable: more than half a day, so not a connection we count.