F9 45 then ET 3511 at O'Hare
Cancún → Chicago → Muscat
Timetable, Chicago time
14:45F9 45 from Cancún at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 20 apart on the timetable, overnight
ET 3511 leaves 18 h 20 after F9 45 arrives on the timetable: more than half a day, so not a connection we count.