Required To carry an Irish passport When in Northern Ireland????

Maybe I'm wrong but that was changed with the 27th amendment. If you are born in Ireland to non-irish parents you do not have automatic entitlement to Irish citizenship.

Notwithstanding any other provision of this Constitution, a person born in the island of Ireland, which includes its islands and seas, who does not have, at the time of the birth of that person, at least one parent who is an Irish citizen or entitled to be an Irish citizen is not entitled to Irish citizenship or nationality, unless provided for by law

Ill be honest and say I assumed he was talking about being a citizen given the context of the thread and the post he was responding to. Try going to Northern Ireland and telling them you are a member of the irish nation, but not entitled to citizenship and that's why you didn't apply for an ETA.

His Swiss ID will establish his place of birth to the same legal standard as any U.K. or Ireland driving licence. I have in the past regularly entered Ireland on a Hong Kong ID ( as it was the only one which was in a card size which fitted in my wallet) Which in a “local journey” between the U.K. and Ireland was more th a sufficient evidence, legally.

I'm Irish by birth and Swiss by choice, but I don't have a passport for either country

Why is this going off on tangents about constitutions and what airlines may/may not accept.

Go get a passport. This problem solved plus any travel outside Switzerland/Ireland/Uk solved in advance.

A fair assumption, in the context. But the citizenship/part of the nation distinction does raise interesting questions. There's a possible parallel with a citizenship/identity distinction that (the UK government thinks) is implicit in the GFA. The GFA affirms the right of denizens of NI to choose their own identity — British, Irish, both, neither — and not to have an identity imposed on them. But UK law assigns British citizenship to (almost) everyone born in NI. The UK government takes the view that this is not contrary to the GFA; others who consider themselves disadvantaged by this take the view that it is, and the matter ended up in the courts.

An Irish woman born in Derry applied (before Brexit took effect) for an EEA residence card for her US citizen husband. Under UK law at the time, as a British citizen she had more limited rights in this regard that an EU citizen exercising free movement rights would have had, and the application was refused. She objected that she had never identified as British and the imposition of British citizenship on her, to her disadvantage, was a violation of the GFA.

The upshot of that particular case was a change in UK immigration law so that all British citizens born in NI who are seeking to have their foreign spouses reside with them in the UK will be treated as if they were Irish citizens, if that would secure a more advantageous outcome.

That particular change is now irrelevant, since Brexit has taken effect and no-one seeking to bring a spouse to the UK can invoke free movement rights. But it does make the point that identity, or being "part of the nation", is a status distinct from citizenship, and that it can in some circumstances trump citizenship — i.e. you can assert and exercise rights on the basis of your identity/national membership that you don't have arising out of your citizenship.

This isn't a uniquely British/Irish thing. There was a case in Australia a couple of years ago an Aboriginal Australian who was born i,n and a citizen of, New Zealand, was convicted of crimes in Australia. After he had served his sentence the authorities sought to deport him as an alien (which is standard when non-citizens have served a sentence) and he objected that, as an Aboriginal Australian, he couldn't be an "alien" in Australia, even if he didn't have Australian citizenship. He was successful.

It remains to be seen what the scope and effect of the "part of the nation" provision in Art 2 will be, but if the government ever does seek to deport someone who was born in Ireland, I expect we'll find out.

What a first world problem attitude.

There are plenty of people who might get the chance to go away once every few years for a small holiday in one corner of one country in Europe who have to go and get a passport and will be delighted to get that small luxury, yet it is beneath you?