AM 686 then 7L 789 at O'Hare
Mexico City → Chicago → Baku
Timetable, Chicago time
13:12AM 686 from Mexico City at the gate
10:007L 789 to Baku leaves the gate
20 h 48 apart on the timetable, overnight
7L 789 leaves 20 h 48 after AM 686 arrives on the timetable: more than half a day, so not a connection we count.