UA 3236 then UA 462 at Houston
Mc Allen → Houston → Boston
Timetable, Houston time
20:10UA 3236 from Mc Allen at the gate
16:38UA 462 to Boston leaves the gate
20 h 28 apart on the timetable, overnight
UA 462 leaves 20 h 28 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.