Does the 90-day-rule apply to dual citizens as well? I am both a US and a Finnish citizen and arrived here on my Finnish passport because Jetblue would not let me board the plane using my US passport because I had bought only a one-way ticket. I want to stay longer than 90 days.
You're totally fine; as a Finnish citizen, there's no restrictions on how long you can be in the Schengen Zone - and since you arrived on that passport, there also won't be any trouble when you leave (as I think there might be if you'd arrived on your American passport).
Thanks Sander. Now I will be enjoying my long stay in peace without worries.... Happy Midsummer!