QF 7521 then AA 2389 at O'Hare
Anchorage → Chicago → Calgary
Timetable, Chicago time
10:15QF 7521 from Anchorage at the gate
10:00AA 2389 to Calgary leaves the gate
23 h 45 apart on the timetable, overnight
AA 2389 leaves 23 h 45 after QF 7521 arrives on the timetable: more than half a day, so not a connection we count.