Leaders from Britain's aviation industry joined forces Wednesday to urge the British government to ensure that popular European destinations face the least onerous coronavirus travel restrictions when holidays are allowed again.

Under the government's new traffic light system for England, travel to countries in the lowest green category could be opened up to quarantine-free travel from May 17. Passengers would be required to take a pre-departure test as well as the gold standard PCR test on or before day two of their return to England. They would only need to quarantine if they receive a positive result.

The government has said it will categorize destinations — green, amber or red — after analyzing vaccination rates, coronavirus cases and the prevalence of variants of concern. Given the metrics being applied, countries like the United States and Israel are expected to be on the green list immediately, while much of Europe could be placed on the amber list, which would require travelers to self-isolate at home for ten days on their return.

A waitress serves drinks as customers sit at setup tables outside pubs in Soho, in London, on the day some of England's third coronavirus lockdown restrictions were eased by the British government, Monday, April 12, 2021. People across England flocked to shed shaggy locks and browse for clothes, books and other "non-essential" items as shops, gyms, hairdressers, restaurant patios and beer gardens reopened Monday after months of lockdown. (AP PhotoAlberto Pezzali)

A waitress serves drinks as customers sit at setup tables outside pubs in Soho, in London, on the day some of England's third coronavirus lockdown restrictions were eased by the British government, Monday, April 12, 2021. People across England flocked to shed shaggy locks and browse for clothes, books and other "non-essential" items as shops, gyms, hairdressers, restaurant patios and beer gardens reopened Monday after months of lockdown. (AP PhotoAlberto Pezzali)

Aviation minister Robert Courts said Wednesday that the government should be able to give more details about how countries are characterized in early May so the industry — and potential holidaymakers — can start putting plans in place.

“We are giving as much notice as we can,” he said.

Lockdown restrictions are being eased across the U.K. after a stringent three-month lockdown and the rapid rollout of coronavirus vaccines has seen coronavirus cases — and deaths — fall sharply.

With much of Europe in the midst of a surge of the pandemic and lockdown restrictions being re-imposed, there are concerns that popular European destinations, such as the beach resorts of the Costa del Sol in Spain or the Greek islands may not make the green list.

“We would like to see the green category as expansive as possible,” Chris Garton, chief solutions officer at Heathrow Airport, told lawmakers in the House of Commons.

“We understand from a health perspective it’s a proceed with caution time .... but if we err to much on the side of caution then you will have some very devastating effects on the travel sector and the aviation sector,” he added.

The aviation industry around the world has been hammered over the past year with passenger numbers down around 95% from pre-pandemic levels.

Travel to Europe will play a crucial role in the industry's recovery so any delay in putting popular holiday destinations in the green category would spell further financial difficulties.

EasyJet Chief Executive Johan Lundgren said he “would expect almost all major European countries” to be put in the low-risk category immediately and that the airline will be able to fly 20% of its normal schedule between April and June.

Lundgren said he's optimistic that many of easyJet's core markets in Europe will make the cut as the rollout of vaccines picks up pace.

“I wouldn’t see a reason why you wouldn’t have the majority of the countries of Europe in there," he said.

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