There are still four layers of security: presentation of valid government ID, boarding pass, x-ray inspection of carryon luggage, and passing through a magnetometer for the presence of metal.

FORBES: For Some Fliers TSA Security Lines Just Got Much Shorter

In Moscow old-age pensioners carry a chip-based smart card from Visa that acts as a subway pass and id card and affords them discounts at pharmacies.

FORBES: Magazine Article

Our members must have an airside pass to operate aircraft and now discover that to get that pass they must have a national ID card.

BBC: Manchester launch for ID cards

So convinced were the organisers of Mobile World Congress that they encouraged visitors to get an NFC pass for speedier entry to an event where security involves showing photo ID.

BBC: NFC - not for consumers?

If they don't have a frequent-flier ID card, travelers check in online or at kiosks and get a bar code on a printed boarding pass or on a mobile phone, just like at other airlines.

WSJ: Flying Through the Airport

They stole information from a research version of a system made by ID Quantique, a Swiss firm that is trying to commercialise quantum cryptography, by taking advantage of synchronisation signals that pass between Alice and Bob.

ECONOMIST: Secure cryptography is only as safe as its weakest link