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| Machine-readable passports have two lines of code on the photo page |
All Britons travelling to the US without visas now need machine-readable passports under newly-introduced rules.
Almost all British passports issued since 1991 are machine-readable, indicated by two lines of coded data at the bottom of the photo page.
However, the requirement could affect children travelling on a parent or guardian's passport, as they will now need separate documentation to enter.
Britain is one of 27 countries affected by the rule, an anti-terrorism measure.
Travellers who do not have a machine-readable passport will have to apply for a visa to enter the US.
If they arrive in the US without the correct documentation, they will be given a one-time exemption in the form of a letter explaining their documents need to be changed.
Their passport will also be stamped to show they have been warned.
British Airways' James Forster said families should check they have the correct documents "to make their journey as stress free as possible".
The documents have been issued in Britain since November 1991, and holders can travel to the US without a visa for the 10-year lifetime of the document.
Mr Forster, British Airways' government and industry affairs manager, remained optimistic that the changes made by the US State Department would not cause too much disruption.
"We hope that, as the UK has been issuing machine readable passports for the past 10 years, most of our UK-based customers will be OK.
BA policy
"However, we believe that many families may fall foul of the new rules as the children have traditionally been placed on their parents' passports rather than having their own."
However, British Airways would allow passengers without machine-readable passports to board flights to the US because the US authorities were allowing a one-time exemption.
Children born after 5 October 1998 are issued with their own passport, but many children born before that date were included on an adult's passport.
Under UK law, they must get their own passport when they turn 16, the passport on which the child travels expires, or the adult's passport is submitted for amendment.
British passenger Marcus Goodwin said he was unaware of the new US rule, but is not expecting any problems as his 15-month-old son has both a US and a UK passport.
"You would assume [passport regulations] were going to stay the same, unless there had been an enormous advertising campaign. I haven't seen anything," he said.
The fastest a passport can be issued in the UK is 48 hours, with the usual time being about two weeks, the Passport Office said.
Standard issue
The machine-readable passports, standard issue in most countries, (The British Embassy in Caracas has been operating with the new machine for 6 months now) contain lines of coded data usually beneath the passport photo which can be swiped at airport check-in and at US immigration.
It allows the information on the passport to be immediately cross-checked against databases run by the US security services.
Most countries in the European Union are affected by the new rules as well as Australia, New Zealand, Japan and Singapore.
The changes are being driven by the US department of home and security and the State Department.
They say they need as much information as possible on every visitor to the US to help ensure the safety of American citizens.