For all my intl trips, I fly on AA out of JFK, I scan my passport in the self-check-in terminal and I get my bp. I put my passport away in my luggage and use my dl to go through security. NO ONE looks at my pp until I arrive at my foreign destination--AA does not do pp checks at the gate. Now that I can print my bp at home, I am curious how this plays out: they have my pp number on file (I gave it to them), but if the above scenario plays out NOW, I would still be allowed to fly even if I left my pp home.
On several trips out of LHR, no govt agent looked at my pp, only AA agents at the gate. [One or two times there was a "govt official" looking at pp's.]