UA 2148 then ET 3511 at O'Hare
Washington National → Chicago → Muscat
Timetable, Chicago time
19:30UA 2148 from Washington National at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 35 apart on the timetable, overnight
ET 3511 leaves 13 h 35 after UA 2148 arrives on the timetable: more than half a day, so not a connection we count.