AA 3390 then UA 359 at O'Hare
Greensboro → Chicago → Mexico City
Timetable, Chicago time
19:35AA 3390 from Greensboro at the gate
08:55UA 359 to Mexico City leaves the gate
13 h 20 apart on the timetable, overnight
UA 359 leaves 13 h 20 after AA 3390 arrives on the timetable: more than half a day, so not a connection we count.