Originally Posted by
gustavmahler
I'm a UK citizen with an ESTA. However, at MIA I got an X and had to queue up (much to the frsutration of my American wife!). The guy couldn't tell me why I wasn't allowed through, but does anyone here know if there's anything I can do to prevent this next time?
We live in the UK and I've never started the process of getting a green card.
EDIT: The itinerary on that trip was ex-DUB, not LON so maybe that was an issue?
If neither you nor anyone else knows why you got the X, it's just a guessing game on what, if anything, you can do to prevent getting an X next time.
There is a list that was put together on some of the most frequent reasons people end up with an X when using APC kiosks; that could -- if someone here has current access to the list -- provide some guidance on what to try to do and/or not do.