VS 21 then UA 4926 at Dulles
London → Washington → Albany (New York)
Timetable, Washington time
17:40VS 21 from London at the gate
17:30UA 4926 to Albany (New York) leaves the gate
23 h 50 apart on the timetable, overnight
UA 4926 leaves 23 h 50 after VS 21 arrives on the timetable: more than half a day, so not a connection we count.