Originally Posted by
seawolf
Once again I’m not sure why people here are so fixated that travel document airline captured and passport presented by traveler to authorities have to match.
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.