UA 654 then ET 3511 at O'Hare
Washington National → Chicago → Muscat
Timetable, Chicago time
18:29UA 654 from Washington National at the gate
09:05ET 3511 to Muscat leaves the gate
14 h 36 apart on the timetable, overnight
ET 3511 leaves 14 h 36 after UA 654 arrives on the timetable: more than half a day, so not a connection we count.