UA 474 then ET 3511 at O'Hare
Mexico City → Chicago → Muscat
Timetable, Chicago time
19:34UA 474 from Mexico City at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 31 apart on the timetable, overnight
ET 3511 leaves 13 h 31 after UA 474 arrives on the timetable: more than half a day, so not a connection we count.