AA 4185 then ET 3511 at O'Hare
Marquette → Chicago → Muscat
Timetable, Chicago time
17:27AA 4185 from Marquette at the gate
09:05ET 3511 to Muscat leaves the gate
15 h 38 apart on the timetable, overnight
ET 3511 leaves 15 h 38 after AA 4185 arrives on the timetable: more than half a day, so not a connection we count.