He was on board an Air France aeroplane flying from Rio de Janeiro to Paris early on 1 June 2009 when it mysteriously crashed over the Atlantic Ocean . He was on Air France Flight 447 from Rio de Janeiro to Paris early on 1 June 2009 when it mysteriously crashed over the Atlantic Ocean off the coast of Fernando de Noronha together with Prince Pedro LuÃ s of OrlÃ ans-Braganza .