Originally Posted by
HkCaGu
Because if a kiosk or computer is not expecting you, it will kick you to a human or it will take longer. Another poster already explained a reason to avoid complications.
I learned that lesson in 2013 when I gave UA my US passport but wanted to be admitted as BNO at LHR. The officer was not happy, but could not deny me. It took a little extra time to override/reconcile/whateverhehadtodo.
Would you then agree that we need a two-APIS solution?