The capacity of an airport, which in Italy is established by ENAC with the involvement of the interested parties, is established based on the capabilities of the individual airport, which in turn depend on: ■ the air navigation sector plan, which concerns the operating and control capacity of the air traffic overseen by ENAV; ■ the runway system and related infrastructure, in particular aprons and terminals; ■ traffic demand factors; ■ environmental restrictions, such as anti-noise procedures and the suspension of flights during hours of darkness.