AA 2509 then ET 3511 at O'Hare
Charlotte → Chicago → Muscat
Timetable, Chicago time
16:10AA 2509 from Charlotte at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 55 apart on the timetable, overnight
ET 3511 leaves 16 h 55 after AA 2509 arrives on the timetable: more than half a day, so not a connection we count.