BA 809 then VS 21 at Heathrow
Copenhagen → London → Washington
Timetable, London time
13:30BA 809 from Copenhagen at the gate
13:20VS 21 to Washington leaves the gate
23 h 50 apart on the timetable, overnight
VS 21 leaves 23 h 50 after BA 809 arrives on the timetable: more than half a day, so not a connection we count.