Earlier quoted context omitted.
The CTA only applies to British and Irish citizens, others are not allowed to make use of it. So on flights, full ID checks have been in force for entry to the UK for any years - since around 1995 or so. One can still travel between Ireland and GB on ferries and avoid ID checks, but if one is not an Irish or British citizen, once can not make use the the CTA (which is not a "travel area", but reciprocal privileges fo…
You’re right that full ID checks happen (I think? Ryanair force a visa check for all non EU/EEA passengers, nothing to do with CTA. What happens on AerLingus/BA? I think they just check ID, not visas) But non-British/non-Irish do benefit from and indirect make use of the CTA though. They arrive as domestic passengers in to the UK from Ireland and therefore they do not enter the UK in the same manner as passing throug…
No - Simply that they're supposed to fulfill the entry requirements for non British or Irish folks, or risk arrest, prosecution, and being deported. That happened to some folks from Peru (I believe), who traveled to GB via Ireland, NI, then ferry to Scotland.
Simply the CTA is misnamed, it is not a "travel area", that is simply an effect arising out of the reciprocal rights of British and Irish citizens in the other state.