Originally Posted by
Often1
3. Carriers do check passports (and other docs) because they are liable to a significant fine and all of the costs associated with repatriating the pax if he is denied entry based on insufficient docs.
As I already mentioned, a EU citizen can re-enter the EU with any type of document proving citizenship, just like a US citizen re-entering the US.
Originally Posted by
Often1
4. IDB applies to oversold situations only. Urban myth to use it for other stuff.
You evidently don't know well the EU rules.