Originally Posted by
FlyingFreeYupie
I'm European, but I let my European passport expire 2 years ago, and whenever I travel to Europe, I use a third country passport to check-in and once there, I enter Schengen with my National ID card. Will airline accept my National ID card also with my third party passport without requiring ETIAS?
I would not be confident in airline staff accepting you for travel with an EU national ID card and a non-EU passport with no ETIAS, because they will not be trained on such documents.
You would probably be fine at a land border.