Grant Shapps today warned of major challenges reopening Transatlantic travel with states having different systems for proving whether Americans are double-jabbed.
The Transport Secretary said the government is working on plans to allow fully-vaccinated people to visit the UK without needing to quarantine.
But he cautioned that it would be 'easier' to organise systems for some places than others, pointing out that there are '50 different systems' for proving vaccine status in the US - many of them paper based.
By contrast the EU has been setting up a digital app that will apply across the bloc, similar to the NHS arrangements.
Mr Shapps announced yesterday that from so-called 'Freedom Day' on July 19, people who have received both doses in the UK can visit amber-list destinations without having to quarantine on their return.
Grant Shapps said the government is working on plans to allow fully-vaccinated people to visit the UK without needing to quarantine
There are currently severe restrictions on travel to and from the US. Pictured, details from the Sky Scanner website
Announcing the move in the Commons, Mr Shapps confirmed that from the so-called 'Freedom Day', double-jabbed people can visit amber-list destinations without having to quarantine on their return