Originally Posted by Howard

At SAN and possibly at other US airports (?), they are now using CBP facial recognition for boarding international flights. In this scenario you don't present your boarding pass or a passport to board the aircraft. Instead, you simply walk up to the facial recognition device, and if it's green, you board the flight. If someone is a dual US/Canada citizen, is this facial recognition matching against their Canadian or US passport? Does it depend on which passport was used at checkin? If it's using the Canadian passport, wouldn't that be a concern with respect to the requirement to exit the US with a US passport?

For example, for scenario 3 above, would CBP match against the Canadian passport and therefore think the passenger is exiting the USA on a Canadian passport? Or, is the system smart enough to know that the passenger is a dual citizen?

Similarly, for scenario 2 above, if CBP matches against the US passport, that would satisfy the exit requirement, but if the Canadian passport is used on arrival, it would conflict with any passenger information the airline transmitted to CBSA. My understanding is that the airline generally wants you to checkin with the passport you're using at your destination.

Bottom line question - at an airport with CBP facial recognition for boarding, is scenario 2 or scenario 3 the correct practice? (Let's assume it's not scenario 1 because the passenger intends to use their Canadian passport upon arrival in Canada.)

Originally Posted by simpleSnow

I can't believe this isn't an option yet, given the amount of people that have dual passports. It shouldn't be that hard to implement really.