AA 3300 then ET 3511 at O'Hare
Denver → Chicago → Muscat
Timetable, Chicago time
11:45AA 3300 from Denver at the gate
09:05ET 3511 to Muscat leaves the gate
21 h 20 apart on the timetable, overnight
ET 3511 leaves 21 h 20 after AA 3300 arrives on the timetable: more than half a day, so not a connection we count.