AA 2530 then ET 3511 at O'Hare
Charlotte → Chicago → Muscat
Timetable, Chicago time
14:20AA 2530 from Charlotte at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 45 apart on the timetable, overnight
ET 3511 leaves 18 h 45 after AA 2530 arrives on the timetable: more than half a day, so not a connection we count.