So given that it appears that various other airlines have their planes registered on what looks to me like the Irish register do they come under the same regulations as Ryanair? I'm thinking specifically of Norwegian - an example is B738 EI-FJX. Also, Alitalia, E175 EI-RDA as an example, apologies if I'm straying off topic slightlyIf you look back in this forum this subject has been discussed several times.
What Ryanair can do is irrelevant to aircraft on the Uk register. Easa regulations are somewhat weird.