The Irish Times has a story on new incentives being offered at the DAA group airport
Incentives to airlines will include €3 tax waiver - The Irish Times - Tue, May 10, 2011
It's a bit confusing as stands as it appears to punish the incumbents. They get the passenger numbers to the 2010 levels and the new entrants get the benefit.
I assume this is sloppy reporting rather than the actual case.