AA 1668 then K4 556 at O'Hare
Dallas-Fort Worth → Chicago → Tokyo Narita
Timetable, Chicago time
23:15AA 1668 from Dallas-Fort Worth at the gate
16:00K4 556 to Tokyo Narita leaves the gate
16 h 45 apart on the timetable, overnight
K4 556 leaves 16 h 45 after AA 1668 arrives on the timetable: more than half a day, so not a connection we count.