Airports are critical infrastructure. They often receive support from the State and the European Commission has adopted specific guidelines to soften the principle of prohibition of State aid in this area. Yet it is not necessary that the regulation be the mask of a violation of competitive equality. This is why the Commission has extended and prolonged on June 27, 2012, the investigation initiated in 2007 proposed to the airport of Alghero, Italy. Indeed, the investigation revealed including infrastructure subsidies, which the Commission doubt that they are comply with EU law.