Originally Posted by
simpleSnow
Well next year most probably there will be European ESTA, so it will mean you will have to somehow present to the airline that you are EU citizen so that they don't make you apply for the travel authorization. Very similar to how one should show to airline he or she is US citizen when going back to US because US citizen cannot apply for ESTA. This is very easy to solve if given airline has their online system set up for multiple passports.
Then it becomes a matter of preference honestly, e.g. if you have bought a roundtrip ticket from US to EU:
- if you buy ticket with EU passport info, you only need to present yourself as US citizen on the return leg so they OK you not having American ESTA.
- if you buy ticket with US passport info, you only need to present yourself as EU citizen on the flight to the EU.
Even when it comes to ETIAS going live and being generally required, it will still generally work for some US passport users to fly into the Schengen zone without having any “European ESTA” associated with the Schengen-bound traveler’s US passport. US-EU dual-citizens and some mix of US(-only) citizens will continue to be able to fly from say the US to Denmark on the US passports without an approved “European ESTA”. A flash of the acceptable documentation for an ETIAS-waiver alongside a US passport will work still for at least some US passport-using travelers to enter the Schengen area without any “European ESTA”.