I think you refer to this:
http://alitalia.com/us_en/Volare-Ali...lezionati.html
The most important thing is
The offer, which only applies to certain dates and selected flights, is subject to availability, meal quotas and special assistance
So basically get to the airport and hope.
I'm not sure it applies to any ticket or only AZ; for sure other options (miles upgrade, etc.) apply to AZ tickets only (055).