AA 3588 then ET 3511 at O'Hare
Little Rock → Chicago → Muscat
Timetable, Chicago time
14:23AA 3588 from Little Rock at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 42 apart on the timetable, overnight
ET 3511 leaves 18 h 42 after AA 3588 arrives on the timetable: more than half a day, so not a connection we count.