UA 3913 then B6 932 at Houston
Denver → Houston → Boston
Timetable, Houston time
21:22UA 3913 from Denver at the gate
14:01B6 932 to Boston leaves the gate
16 h 39 apart on the timetable, overnight
B6 932 leaves 16 h 39 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.