AA 4912 then ET 3511 at O'Hare
Grand Rapids → Chicago → Muscat
Timetable, Chicago time
16:22AA 4912 from Grand Rapids at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 43 apart on the timetable, overnight
ET 3511 leaves 16 h 43 after AA 4912 arrives on the timetable: more than half a day, so not a connection we count.