AA 2745 then K4 556 at O'Hare
Las Vegas → Chicago → Tokyo Narita
Timetable, Chicago time
23:35AA 2745 from Las Vegas at the gate
16:00K4 556 to Tokyo Narita leaves the gate
16 h 25 apart on the timetable, overnight
K4 556 leaves 16 h 25 after AA 2745 arrives on the timetable: more than half a day, so not a connection we count.