B6 817 then LA 8181 at JFK
Boston → New York → São Paulo
Timetable, New York time
19:59B6 817 from Boston at the gate
19:10LA 8181 to São Paulo leaves the gate
23 h 11 apart on the timetable, overnight
LA 8181 leaves 23 h 11 after B6 817 arrives on the timetable: more than half a day, so not a connection we count.