So if I understand it correctly, when the UK introduces it's new ETA system, UK/Irish/EU citizens will not need to apply for a visa to travel Northern Ireland. So the question arises - how do you prove you are an Irish citizens? Do you have to carry a passport or passport card? will they do some kind of random check? How is this in line with the GFA?
I'm Irish by birth and Swiss by choice, but I don't have a passport for either country. My first thought was to fly to Belfast, but that is not going to work because you absolutely need a passport to board such flight from Zurich. So I thought Dublin as I always go on a Swiss ID card, but it seems that I'm snookered there as well now since I'd need an Irish passport.