AA 1910 then ET 3511 at O'Hare
Cancún → Chicago → Muscat
Timetable, Chicago time
16:32AA 1910 from Cancún at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 33 apart on the timetable, overnight
ET 3511 leaves 16 h 33 after AA 1910 arrives on the timetable: more than half a day, so not a connection we count.