Never mind charters their dead in the water, NOC leads to learn the lesson that bucket and shuvel routes are no good in this climate and try get proper routes i.e. Paris, Madrid, Rome, Milan, Frankfurt etc.. developed with year-round demand.
I would argue that the sun routes are the ones that have the demand. Yes it is seasonal, but that is why FR operate these routes, as such. Even DUB struggles to keep more than daily service to MAD, Milan and Rome, yet there are multiple daily flights to the likes of AGP and FAO, with 738, A330 and A321. ORK has no connection to FRA, MAD, MXP or MAD, KIR has HNN but thats about it. This tells it's own story about the demand profile from Ireland. People want the sun holidays, not the city breaks.