Originally Posted by
arir
I thought so too but they do scan it just before boarding - I always notice a green light flash as an "OK" sign. But is this an airline check or an immigration check?
Surely there must be some level of control/logging linked to Interpol or similar? Where would they catch questionable passports or wanted criminals? Which is exactly my worry - maybe they don't

But again, certainly in T5, that is NOT a Passport scan but a BP scan!
Immigration checks are done from the list of booked PAX supplied by the airline.