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Comment by fmobus | Hacker News Reader

I don't think what you said in the last sentence is going to be an issue. Each check-in can be handled separately: you check-in to Spain with the Spanish passport, you check-in to the US with the American passport. There will probably be a box in the reservation system to say "I don't need ETIAS/ESTA"

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The air carrier is responsible for taking the passenger(s) back if they are denied entry into a country.

So the airlines will deal with many people falsely checking the box (“I am a blank; I don’t need it!”) and remove the checkbox immediately.

Yeah, Im dual US/Swedish citizen, and the check in is isolated each time. I present my US passport when going to the US and my Swedish Passport when going to the EU. No biggie and never had any trouble throughout my life.

So in the Schengen logs, it seems like you keep entering Sweden (or wherever you transit) but never leave it?

Or do you show your Swedish passport on leaving Schengen?

Not OP, but in my experience they will look for a Schengen entry stamp during the exit control.

Showing e.g. a Swedish passport for border entry and exit, and a US passport for check-in works fine.

I agree this would be absurd - that’s my point. But I have also heard of all kinds of bizarre things like this happening because the penalties for the airline are so high. Mostly flying Iberia there seems to be a focus on the document you show the airline matching the one in their system and you can only add one to their system.

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