Originally Posted by ToadHallRacing

In a similar vein, I’d be grateful for any reports on how this is working for dual U.S.-U.K. nationals. Specifically, what happens when you try to check in using your U.S. passport but do not have an ETA (since you don’t need one)? My hunch is you won’t be able to check in via the app and you’ll need to get an override from the check-in agent at the airport. Thanks in advance.