Apart from your travel documents (air ticket and boarding card), you must also have some form of identification on you.
The type of identification required depends on the country you are heading to. When you plan your journey, remember to check that all your documents (Identity Card or Passport) have not expired and that they are valid for travel abroad.
For the benefit of the general public, the Italian State Police Administration offices have published on the official website a special detailed chart showing all the forms of identification valid for travel abroad required by each single foreign State, including those which have signed the Schengen Treaty.
For further information, please visit the website of the Italian State Police