AA 2999 then ET 3511 at O'Hare
Dallas-Fort Worth → Chicago → Muscat
Timetable, Chicago time
10:05AA 2999 from Dallas-Fort Worth at the gate
09:05ET 3511 to Muscat leaves the gate
23 h apart on the timetable, overnight
ET 3511 leaves 23 h after AA 2999 arrives on the timetable: more than half a day, so not a connection we count.