They're not basing extra aircraft, they've actually reduced their fleet size and capacity on many routes. If you're referring to Aer Lingus Regional, thats all down to Aer Arann, not Aer Lingus.
FYI they are basing a extra A320 next summer.
Increaseing 22 routes and reducing just 3. (as posted a few pages back) and that does not include EI regional flights. So are they reducing capacity on many routes??????
On airport charges they are lower thatn airport that handle in the region of 20 million, will find the survay if I can and post it.
As was proved with Shannon, a €10 tax (passed on to passengers) could be the difference between whether an airline makes a profit or loss on a route
So the passenger pays for the air fare and at the airport so the airlines can make a profit.