Ryanair had a row with Pescara at the start of the year. Back in March the head of Pescara airport went to Dublin to persuade Ryanair in Pescara's favour but to no avail.
I have a feeling it's something to do with Pescara being perceived as giving Alitalia an unusually good deal but I could well be wrong on this.
http://www.anna.aero/2016/02/04/ryan...ve-into-w1617/