UA 3761 then BA 292 at Dulles
Clarksburg → Washington → London
Timetable, Washington time
07:09UA 3761 from Clarksburg at the gate
21:45BA 292 to London leaves the gate
14 h 36 apart on the timetable
BA 292 leaves 14 h 36 after UA 3761 arrives on the timetable: more than half a day, so not a connection we count.