BR 646 then AM 687 at O'Hare
Anchorage → Chicago → Mexico City
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
15:26AM 687 to Mexico City leaves the gate
22 h 16 apart on the timetable, overnight
AM 687 leaves 22 h 16 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.