Alitalia is offering 20% off all flights in economy or business class (not in premium economy) network-wide through noon local time on May 21, for travel through April 15, 2013.
Details thanks to translation skills of The Google:
USE THE CODE: SPECIAL20IT
This week you reserve an offer not to be missed. Buy online between 12:00 on 18 May at 12:00 on May 21, 2012. For you a special discount of 20% of all destinations of the Alitalia network. Discount of 20% applies on the total ticket price (taxes, surcharges and service sales included), all of the destinations of Alitalia network purchased in Classic classes of service – Economy, Great and Magnificent – Business, Premium Economy with the exception of – Classic Plus Offer ‘valid for flying from May 22, 2012 April 15, 2013.
I’m impressed that the discount isn’t just off of base fare, but also off fuel surcharges and taxes.