AA 2570 then K4 556 at O'Hare
Salt Lake City → Chicago → Tokyo Narita
Timetable, Chicago time
21:55AA 2570 from Salt Lake City at the gate
16:00K4 556 to Tokyo Narita leaves the gate
18 h 05 apart on the timetable, overnight
K4 556 leaves 18 h 05 after AA 2570 arrives on the timetable: more than half a day, so not a connection we count.