UA 5424 then AC 8482 at O'Hare
Washington National → Chicago → Montréal
Timetable, Chicago time
14:33UA 5424 from Washington National at the gate
13:55AC 8482 to Montréal leaves the gate
23 h 22 apart on the timetable, overnight
AC 8482 leaves 23 h 22 after UA 5424 arrives on the timetable: more than half a day, so not a connection we count.