British Airways is testing passenger access systems at London Heathrow Airport without presenting a passport.

Strictly speaking, you still need to present a passport, but only once - during registration. At this point, the system "remembers" the passenger's appearance. When the passenger approaches the gate (boarding gate), the system “recognizes” the passenger and opens him the passage on board the aircraft. Or does not open if the passenger is “alien”.
The system is expected to reduce landing time and reduce errors. This is important for Heathrow - the busiest airport in Europe. Now the method is being tested on three gates out of 36, and only on domestic flights.
Such systems
are planned to be implemented at the airports of Schiphol in the Netherlands (the 5th busiest in Europe), Guarulhos (the busiest in Brazil), Changi in Singapore, etc.

')
An alternative method was recently tested at Bangalore’s Indian airport. They did not use the facial recognition system, but a high-speed contactless fingerprint scanner. The passenger passed his hand over the scanner, and the computer in less than a second knew whether the person who had registered, and made the decision to pass it on the plane. But. To use such a system, you must be registered in the
UIDAI - the global Indian system of bio-identification of citizens.