AA 2258 then 7L 789 at O'Hare
Las Vegas → Chicago → Baku
Timetable, Chicago time
12:52AA 2258 from Las Vegas at the gate
10:007L 789 to Baku leaves the gate
21 h 08 apart on the timetable, overnight
7L 789 leaves 21 h 08 after AA 2258 arrives on the timetable: more than half a day, so not a connection we count.