AA 725 then ET 3511 at O'Hare
Los Angeles → Chicago → Muscat
Timetable, Chicago time
16:05AA 725 from Los Angeles at the gate
09:05ET 3511 to Muscat leaves the gate
17 h apart on the timetable, overnight
ET 3511 leaves 17 h after AA 725 arrives on the timetable: more than half a day, so not a connection we count.