UA 563 then GG 9723 at O'Hare
Boston → Chicago → Tokyo Narita
Timetable, Chicago time
19:00UA 563 from Boston at the gate
10:30GG 9723 to Tokyo Narita leaves the gate
15 h 30 apart on the timetable, overnight
GG 9723 leaves 15 h 30 after UA 563 arrives on the timetable: more than half a day, so not a connection we count.