AA 4915 then K4 556 at O'Hare
Lexington → Chicago → Tokyo Narita
Timetable, Chicago time
20:00AA 4915 from Lexington at the gate
16:00K4 556 to Tokyo Narita leaves the gate
20 h apart on the timetable, overnight
K4 556 leaves 20 h after AA 4915 arrives on the timetable: more than half a day, so not a connection we count.