AC 7301 then UA 3376 at O'Hare
Montréal → Chicago → St Louis
Timetable, Chicago time
11:35AC 7301 from Montréal at the gate
11:00UA 3376 to St Louis leaves the gate
23 h 25 apart on the timetable, overnight
UA 3376 leaves 23 h 25 after AC 7301 arrives on the timetable: more than half a day, so not a connection we count.