The numbers of foreign flights from the UK to "amber list" destinations have jumped, despite continued uncertainty around the advice from the government about which locations are on the safe list.
According to data from aviation analysts at Cirium published by The Observer, a total of 1,841 flights were scheduled to France, Spain, Italy and Greece for the two weeks following last Monday.
That total is a 300% increase compared with the fortnight before.
Cirium said that the increase could see 356,768 passengers travelling to countries on the amber list.
The moves from airlines come as the government has continued to warn against travel to amber list countries.
Industry bosses such as easyJet's (EZJ.L) Johan Lundgren have called the advice "very confusing" and frustrating for customers.
Speaking last week he said that travel to amber list destinations is "absolutely legal" despite the government's warnings. The legal ban on foreign holidays ended on Monday.
Transport secretary Grant Shapps has previously denied that the government was sending mixed messages about travel.
The majority of popular European destinations are on the amber list, meaning anyone travelling from the UK to those countries is required to take a COVID-19 test before they return and isolate for 10 days, taking two more tests during isolation.
Those booking holidays to amber list destinations could be facing losses, with the knock-on effect of potential discrepancies in travel insurance and airline policy posing a potential issue.
Research from consumer group Which? released last week has showed that those buying travel insurance could be left out of pocket after being left with a false impression of the level of protection they might benefit from.
Which? believes some of this is down to poor communication by travel insurance providers and the use of often confusing, blanket terms such as ‘Covid Cover’ or ‘Enhanced Covid Cover’ on insurers’ websites.
The survey of over 2,800 travel insurance customers, conducted between February and March 2021, found that three in 10 respondents (29%) had committed to bookings or arrangements for international trips this year – with around one in 10 (12%) saying that while they’d not booked or arranged travel, they did have specific plans.
Watch: Should I book a holiday in 2021?