UA 787 then ET 3511 at O'Hare
Houston → Chicago → Muscat
Timetable, Chicago time
16:29UA 787 from Houston at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 36 apart on the timetable, overnight
ET 3511 leaves 16 h 36 after UA 787 arrives on the timetable: more than half a day, so not a connection we count.