UA 247 then AA 1976 at O'Hare
Memphis → Chicago → Puerto Vallarta
Timetable, Chicago time
09:00UA 247 from Memphis at the gate
08:43AA 1976 to Puerto Vallarta leaves the gate
23 h 43 apart on the timetable, overnight
AA 1976 leaves 23 h 43 after UA 247 arrives on the timetable: more than half a day, so not a connection we count.