Originally Posted by
simpleSnow
I think questions regarding dual-citizen travel are going to explode when ETIAS goes live; since there's a good amount of dual EU-US citizens that are exempt from both ESTA and ETIAS. I really hope there's a system to allow such dual citizens to still check in online, if they have to manually check all the dual citizens, it's going to be a great headache.
I don't think it will be a problem. You just have to do OLCI with the passport for your destination. We have this today. If you fly from Europe to the US with your Euro passport you need ESTA. If you use your US passport, you don't.