The boss of the group behind Manchester, East Midlands and Stansted airports has said the Government's latest travel guidelines are "a long overdue step" but added that "serious questions remain".
Manchester Airports Group chief executive Charlie Cornish's comments came after Transport Secretary Grant Shapps announced that fully vaccinated travellers from amber list countries may no longer have to self-isolate as he opened up holidays to several Mediterranean hotspots.
Mr Shapps followed the administrations in Scotland and Northern Ireland in adding Malta and Spain's Balearic islands to the ranks of green list countries.
The list - from which returning travellers are not required to self-isolate - has also been extended to a number of Caribbean destinations including Bermuda, Antigua, Barbados and Grenada.
Mr Cornish said: "[This] announcement is a long overdue step towards a restart for international travel, giving customers more options when looking to book a holiday this summer.
"However, serious questions remain as to why these destinations weren’t opened-up sooner when there is clear evidence to suggest this could have been done weeks ago.
"At the same time, the Government has again failed to publish the data and advice it is using to inform its decisions, which makes it harder to prepare for any future changes to the lists.
"Stating an intention to enable double vaccinated people to travel to amber countries without the need to self isolate on return is also long overdue and this policy must be implemented as soon as possible.
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"Vague and open-ended promises are just not good enough.
"While 海角视频 citizens are stuck at home, Europeans are on the move and taking advantage of their own vaccination programmes to lift restrictions and open-up travel to low-risk destinations.
"The Government already has clear evidence on the effectiveness of vaccines, but its sluggish and opaque response to international travel restrictions is squandering the 海角视频’s leadership in this area.
"With no transparency from Government, we simply cannot understand how Ministers are taking these decisions, which are fundamental to the future of a sector that supports more than 1m jobs and billions of pounds of economic value."
Manchester Airports Group is currently in a legal fight with the Government, alongside Tui, the owner of British Airways, Ryanair and Virgin Atlantic against the Government over its international travel traffic light system
Commenting on Thursday, Mr Shapps said the Government would continue to take a "cautious" approach to reopening foreign travel.
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However, he said the rollout of the coronavirus vaccination programme meant they could start to look at plans for easing restrictions on travel from amber list countries as well.
"Thanks to our successful vaccination programme, our intention is that later in the summer 海角视频 residents who are fully vaccinated will not have to isolate when travelling from amber list countries," he tweeted.
"We'll set out further details next month."
The changes to the green list destinations will come into effect at 4am on June 30.
Airport Operators Association chief executive Karen Dee said: "Any extension of the green list is welcome, however small, but we also have to be realistic: this is not yet the meaningful restart the aviation industry needs to be able to recover from the pandemic."
Shai Weiss, chief executive of Virgin Atlantic, added: "It's a constructive step that the Government has recognised that Antigua, Barbados and Grenada can be classified as 'green' allowing family and friends to finally reunite and enable much needed holidays.
"However today's announcement fails to go far enough."