Usually the companies in charge of a public service established with the State of the "plan contract". In application of the "Code de l'aviation civile (Civil Aviation Code), the private company "Aéroports De Paris - ADP" (Paris Airports) establishes a "contract of regulation". This one develops "contracts of economic regulation". They must generate visibility for the company and for the customers, set ceilings for the royalty, set quality objectives, respect the just remuneration of invested capital. The new "regulation agreement" concluded between the French State and "Aéroports De Paris - ADP" (Paris Airports) covers the 2011-2015 period, presented as a period of transition towards the profitability of capital. This contract was signed in July 2010. The contract was presented to investors June 27, 2012 in its implementation, "Aéroports De Paris - ADP (Paris Airports) progressing in its profitability.