UA 1388 then UA 3263 at Houston
Boston → Houston → Richmond
Timetable, Houston time
13:12UA 1388 from Boston at the gate
07:00UA 3263 to Richmond leaves the gate
17 h 48 apart on the timetable, overnight
UA 3263 leaves 17 h 48 after UA 1388 arrives on the timetable: more than half a day, so not a connection we count.