i am more than happy to pay for the development of all airports I use, and that cost is one of the items very correctly included in airport taxes/fees. But Knock airport has come up with a sneaky semantic trick: they impose a supplementary "development tax", thatbthey spring at the last minute on the poor unsuspecting passangers that have the misfortune to be trapped there. It's a dirty trick so they can appear to be cheaper then they really are when people are purchasing their tickets and choosing their airports!
It is also wrong for them to try to blame the lack of transparency on the airlines: if they were even trying to be honest about it, they would have posted a clear warning on their website, which they have not done.
ALL airport charges and fees should be included in the boarding fee, and any departure from this classic structure should CLEARLY DIVULGED to passengers.
I will never fly this airport again.