Why your biometric ticket might not be good enough

A biometric scanner is a new type of ticket, designed to let you control how long it takes to check in at a ticket gate, which is often a hassle for people without a seat.It's being rolled out to all passengers on flights between Europe and the US, with the aim of making ticket machines simpler and easier to use.But for many passengers, there's no simple way to check whether their biometric data i...