UA 3011 then B6 1632 at Houston
São Paulo → Houston → Boston
Timetable, Houston time
06:36UA 3011 from São Paulo at the gate
19:05B6 1632 to Boston leaves the gate
12 h 29 apart on the timetable
B6 1632 leaves 12 h 29 after UA 3011 arrives on the timetable: more than half a day, so not a connection we count.