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Visa-free travel is permissible only with a valid ESTA – which stands for the Electronic System for Travel Authorisation.

While the US authorities have always advised that applications are made at least three days in advance, many travellers have had their ESTA granted almost instantly – including passengers who turn up at the airport without the permit.

But a news reminder on the front page of the official site warns: “Apply for ESTA no later than 72 hours before departing for the United States.

“Real-time approvals will no longer be available and arriving at the airport without a previously approved ESTA will likely result in being denied boarding.”

A valid ESTA does not guarantee admission to the US, with the DHS warning: “Upon arrival in the United States you will be inspected by a Customs and Border Protection officer at a port of entry who may determine that you are inadmissible.”

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