AC 8477 then ET 3511 at O'Hare
Montréal → Chicago → Muscat
Timetable, Chicago time
11:07AC 8477 from Montréal at the gate
09:05ET 3511 to Muscat leaves the gate
21 h 58 apart on the timetable, overnight
ET 3511 leaves 21 h 58 after AC 8477 arrives on the timetable: more than half a day, so not a connection we count.