UA 543 then BR 607 at O'Hare
Buffalo → Chicago → Osaka
Timetable, Chicago time
07:33UA 543 from Buffalo at the gate
00:10BR 607 to Osaka leaves the gate
16 h 37 apart on the timetable, overnight
BR 607 leaves 16 h 37 after UA 543 arrives on the timetable: more than half a day, so not a connection we count.