UA 770 then ET 3511 at O'Hare
Barcelona → Chicago → Muscat
Timetable, Chicago time
18:00UA 770 from Barcelona at the gate
09:05ET 3511 to Muscat leaves the gate
15 h 05 apart on the timetable, overnight
ET 3511 leaves 15 h 05 after UA 770 arrives on the timetable: more than half a day, so not a connection we count.