Many travelers are planning a trip to the United States this year. Most of them use the electronic entry permit “ESTA”. When entering the passport data, the applicant should pay close attention: Is he entering a zero instead of a big “O”, there can be problems at the border. This is indicated by the North American International specialist CRD: “The passport number basically contains only the number zero. The capital letter ‘O’ will never be part of this combination. If travellers fill in a wrong number, there might be problems after arrival at the airport in the United States. As a general rule, therefore: Only one zero …
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