Translate the following English sentence to French:
"I am one of those people who think that a European system of specifications should be introduced, some kind of agency, of course, but which would not necessarily involve privatisation and competition between the various air traffic control centres that exist at the moment."
Je suis de ceux qui pensent qu' il faut introduire un cahier des charges européen, sans doute une agence, mais pas forcément une privatisation et une concurrence entre les différents contrôles aériens existants.