AA 1799 then ET 3511 at O'Hare
Cancún → Chicago → Muscat
Timetable, Chicago time
19:20AA 1799 from Cancún at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 45 apart on the timetable, overnight
ET 3511 leaves 13 h 45 after AA 1799 arrives on the timetable: more than half a day, so not a connection we count.