Yes, that means you must use a US passport when you are leaving a US airport. When you enter at an EU port you you can use whatever passport you want (unless th

Yes, that means you must use a US passport when you are leaving a US airport. When you enter at an EU port you you can use whatever passport you want (unless the country you are entering has a specific requirement). I have an old friend that is dual US / UK citizen and both countries require that he use his passport when entering / exiting the country. So he leaves the US using a US passport, and he enters the UK using a UK passport. And vice versa. If you are a dual EU/US citizen you ONLY have to use your US passport when you enter the US, and when you leave (which hardly counts because there is no exit immigration in the US). Once you arrive in the EU use your EU passport to take the fast line.