BR 646 then AC 8904 at O'Hare
Anchorage → Chicago → Toronto Pearson
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
12:50AC 8904 to Toronto Pearson leaves the gate
19 h 40 apart on the timetable, overnight
AC 8904 leaves 19 h 40 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.