UA 2124 then ET 3511 at O'Hare
Houston → Chicago → Muscat
Timetable, Chicago time
12:45UA 2124 from Houston at the gate
09:05ET 3511 to Muscat leaves the gate
20 h 20 apart on the timetable, overnight
ET 3511 leaves 20 h 20 after UA 2124 arrives on the timetable: more than half a day, so not a connection we count.