Originally Posted by
seawolf
Let's just keep it simple.
On the way to Europe, check in with EU passport so that you don't need an ETIAS on US passport.
One the way to US, check in with US passport so that you don't need an ETA on EU passport.
Is there something with this approach that doesn't work?
It’s as simple as that and I don’t believe even having different names on the two documents will be detrimental unless there’s something technically specific that makes it difficult. But I don’t imagine it’ll change much from before having travel authorizations. If the airline employee has that discretion (and tech access) they’ll just see the proper passport and allow boarding.