I think Ryanair and other LCC's like Wizz are having a change in their business model and are moving away from the ****ty regional airports like Prestwick and shifting towards the more mainstream airports like Glasgow. Passengers no longer want to land one and a half hours away from where they intend going. Maybe this is what is leading to the demise of the "regional" airports. The increase in passenger number and yields will far outweighh the increase in landing and handling charges imposed by the nore "major" airports.