AA 642 then UA 881 at O'Hare
Dallas-Fort Worth → Chicago → Tokyo Haneda
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
13:05UA 881 to Tokyo Haneda leaves the gate
23 h 55 apart on the timetable, overnight
UA 881 leaves 23 h 55 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.