AA 2253 then K4 556 at O'Hare
San Francisco → Chicago → Tokyo Narita
Timetable, Chicago time
23:55AA 2253 from San Francisco at the gate
16:00K4 556 to Tokyo Narita leaves the gate
16 h 05 apart on the timetable, overnight
K4 556 leaves 16 h 05 after AA 2253 arrives on the timetable: more than half a day, so not a connection we count.