AA 2612 then ET 3511 at O'Hare
Houston → Chicago → Muscat
Timetable, Chicago time
20:22AA 2612 from Houston at the gate
09:05ET 3511 to Muscat leaves the gate
12 h 43 apart on the timetable, overnight
ET 3511 leaves 12 h 43 after AA 2612 arrives on the timetable: more than half a day, so not a connection we count.