VS 21 then UA 4950 at Dulles
London → Washington → Ithaca
Timetable, Washington time
17:40VS 21 from London at the gate
08:14UA 4950 to Ithaca leaves the gate
14 h 34 apart on the timetable, overnight
UA 4950 leaves 14 h 34 after VS 21 arrives on the timetable: more than half a day, so not a connection we count.