AA 1253 then ET 3511 at O'Hare
San Francisco → Chicago → Muscat
Timetable, Chicago time
17:05AA 1253 from San Francisco at the gate
09:05ET 3511 to Muscat leaves the gate
16 h apart on the timetable, overnight
ET 3511 leaves 16 h after AA 1253 arrives on the timetable: more than half a day, so not a connection we count.