It`s about time somebody makes Ryanair fly what they file.
I'm working in the Maastricht Brussels sector and whenever we get Ryanair overflights, they allways file KONAN at FL230, but they allways come at FL370
Only reason for this is to avoid being counted in our airspace, and so avoid a refusal, a reroute or a delay. Basically to cheat the system.
One day we should just enforce their requested levels according their flight plan!