AA 4504 then UA 867 at O'Hare
South Bend → Chicago → Tokyo Narita
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
10:40UA 867 to Tokyo Narita leaves the gate
16 h 05 apart on the timetable, overnight
UA 867 leaves 16 h 05 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.