(Alliance News) - Thousands of people have departed on international flights after the ban on foreign holidays was lifted for people in Britain.
Travel firms welcomed the boost in demand but called for coronavirus restrictions to be eased for more destinations.
Portugal, one of just a handful of destinations on the government's quarantine-free green list, will welcome 16 flights from England at Faro Airport in the Algarve on Monday.
Tui AG is using aircraft normally reserved for long-haul routes to accommodate the surge of passengers.
But Jeremy Farrar, director of The Wellcome Trust charity, warned there "is a risk" that the coronavirus variant first identified in India could be transmitted by people travelling out of the UK.
"I think travel should still be very cautious and only when absolutely essential," he told BBC Radio 4's Today programme.
This comes after Health Secretary Matt Hancock said on Times Radio that destinations on the amber list – which includes Spain, France, Italy and Greece – are "places that you shouldn't go to unless you have an absolutely compelling reason".
Those who do travel to an amber country are required to quarantine at home for 10 days on their return.
easyJet PLC Chief Executive Johan Lundgren said the rollout of coronavirus vaccines in the UK and Europe is "key to restarting travel in a safe way".
He went on: "The latest data suggests that most of Europe could actually already from right now go on to that green list of categories.
"And we know there is huge pent-up demand for people to not only go on holidays but to visit friends and family that they haven't been able to see because of the pandemic and the fact that it has been illegal to travel, so it's a big day today for us."
easyJet has added 105,000 extra seats to its flights serving green-tier destinations this summer.
British Airways Chief Executive Sean Doyle said the airline has received "an awful lot of interest" from people planning trips "to reunite with their loved ones".
Speaking from Heathrow Airport, he told BBC Breakfast: "There's a human cost to this, in that a lot of people have been separated from friends and family for over 12 months now.
"That's a segment that we see grow, and a lot of people who are here today are taking part in the opportunity to reunite after a long period of separation."
British Airways is owned by International Consolidated Airlines Group SA.
Gatwick Airport Chief Executive Stewart Wingate said welcoming holidaymakers for the first time in months was a "big relief".
He expects the numbers of travellers to increase tenfold by the end of May – but this will still be less than 15% of the traffic seen in pre-pandemic times.
"It's an important day for us, and important first step, and very much we're looking forward to seeing more countries added to the green list in the weeks ahead," Wingate said
Retired couple Keith and Janice Tomsett, aged 72 and 71, from West Chiltington in West Sussex, departed on one of the first flights from Gatwick on Monday morning, travelling to the Portuguese island of Madeira.
Tomsett said: "We've gone through all the hoops, PCR testing… after 15 months of being locked up this is unbelievably good."
But he expressed frustration the pair will be required to take another test after they return to England.
"We're fully vaccinated, we're going to a green list country and we will be having a test 48 hours before we fly, so why we have to have another one two days later, I do not understand," he commented.
The government has pledged to update its lists on June 7, and will review its overall policy in relation to arriving travellers on June 28.
Non-essential travel from Northern Ireland to the Common Travel Area – which consists of the UK, Republic of Ireland, Channel Islands and Isle of Man, will be allowed from May 24.
By Neil Lancefield and Aine Fox, PA
source: PA
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