AC 523 then ET 3511 at O'Hare
Montréal → Chicago → Muscat
Timetable, Chicago time
15:00AC 523 from Montréal at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 05 apart on the timetable, overnight
ET 3511 leaves 18 h 05 after AC 523 arrives on the timetable: more than half a day, so not a connection we count.