Granted, they have a UK holding company under which UK workers are employed,
but the majority of their staff are on Irish contracts and pay Irish taxes. The
point still stands, Ryanair is as Irish if not more so than Aer Lingus who also
have a UK holding company and employ UK workers under UK contracts (and yet
nobody is arguing Aer Lingus aren't Irish...).
It's just typically Irish
that we have a company that is a world leader in their industry (one of a few
such Irish companies) and one of the biggest airlines in the world, which we
should proud of and yet some people don't even consider them Irish. And then we
turn around and welcome the US multinationals with open arms as if they
are Irish companies.
Ironicly, Guinness is owned by a British Company and the company itself has been based in the UK since 1932