UA 1478 then UA 3263 at Houston
Edmonton → Houston → Richmond
Timetable, Houston time
13:21UA 1478 from Edmonton at the gate
07:00UA 3263 to Richmond leaves the gate
17 h 39 apart on the timetable, overnight
UA 3263 leaves 17 h 39 after UA 1478 arrives on the timetable: more than half a day, so not a connection we count.