AC 7301 then UA 3872 at O'Hare
Montréal → Chicago → LCQ
Timetable, Chicago time
11:35AC 7301 from Montréal at the gate
00:31UA 3872 to LCQ leaves the gate
12 h 56 apart on the timetable, overnight
UA 3872 leaves 12 h 56 after AC 7301 arrives on the timetable: more than half a day, so not a connection we count.