The west coast (Kerry, Shannon, Knock) has not been without a Scottish route for 25 years! Now this summer its without one. The Edinburgh route was very successful from Shannon and was operated Daily on an ATR72 aircraft, along with a 3x weekly Prestwick service from Knock. Now there's none.
Also, there's room for quite a few year round UK routes, 12 weekly transatlantic flights for the worst part of the winter (JAN-MAR), and Europeans.
In my opinion, the West region is most underserved in terms of European Routes. Routes to Cities like Madrid, Lisbon, Frankfurt, Dusseldorf, Cologne, Rome, Amsterdam, Brussels are all possible and Sustainable but they aren't happening.