I marvel at the comments on this thread. Aer Lingus have consistently supported Cork Airport. Comments like Aer Lingus messing around with the AMS schedule, seriously! Get a grip, Aer Lingus is a commercial entity, it needs to fly it's aircraft as prudently as possible to deliver a suitable return. KLM will be exactly the same.
Adding KLM at Cork or indeed Air France for CDG will only serve to erode the level of business that Aer Lingus has whether that be directly to CDG or AMS or indeed to any point in the world via LHR etc. My opinion is that this will lead to an eventual reduction by Aer Lingus at the airport.
We'll see what happens soon no doubt.