CV 251 then AA 1976 at O'Hare
Anchorage → Chicago → Puerto Vallarta
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
10:41AA 1976 to Puerto Vallarta leaves the gate
15 h 41 apart on the timetable, overnight
AA 1976 leaves 15 h 41 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.