One thing that has to be born in mind with the Zurich service is that its primary purpose is to bring Swiss tourists to South-West Ireland and as such, it doesn't really matter whether it goes to Cork, Shannon or Kerry. While it's true that Cork provides a few more Irish pax than Shannon and probably quite a few more than Kerry, that advantage could get undone as route incentives start to unwind. Building up a base of Cork users is crucial to its long-term success.