Bezüglich der 2 oben erwähnten Concorde-Belege hier die Antwort in englisch:

24th May: Transatlantic Services to Washington DC from London and Paris began with two Concorde's, one in British Airways livery and the other in Air France livery landing at Dulles Airport, Washington. Before landing both aircraft simultaneously flew over the US capital and then made parallel approaches to Dulles Airport. Both aircraft touched down together, the British Concorde landed on runway 01L and the French Concorde on runway 01R. Special permission had been given by US Secretary of Transportation, William Coleman for these flights to take place.

Fazit:

Die 2 Flugzeuge (Air France und British Airways) sind gleichzeitig gelandet.