Originally Posted by
GUWonder
For citizens of NPU countries, the above is indeed the case since then. However, the NPU doesn’t exempt me from passport carrying to go between Norway and Denmark. And so within the last couple of decades, SAS OSL check-in has occasionally asked me for my passports and even sometimes pestered over passports for some people who don’t require them to go from OSL to CPH/ARN when I’ve been at check-in at OSL for the SK OSL-CPH/ARN flights with checked luggage.
Even Schengen does not exempt you from carrying a passport, it just removes the mandatory checking at the border. The airline may want to verify an ID, which for non NPU or EU citizens will basically mean a passport. Just like the TSA in the US will only accept my passport as ID when flying domestic US, but I don't consider the TSA using my passport for ID purposes to be a passport control.