B6 778 then UA 723 at Boston
Las Vegas → Boston → Houston
Timetable, Boston time
05:00B6 778 from Las Vegas at the gate
17:17UA 723 to Houston leaves the gate
12 h 17 apart on the timetable
UA 723 leaves 12 h 17 after B6 778 arrives on the timetable: more than half a day, so not a connection we count.